Decrease font Increase font Restore font Asclepias verticillata L.
Literature Based Distribution
Mapping will be based on a standard reference mark based on political units when available.
  • North America
    • United States Kansas Pottawatomie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Reno: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Republic: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Riley: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Rooks: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Rush: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Saline: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Sedgwick: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Shawnee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Smith: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Stafford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Sumner: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Wabaunsee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Washington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Wichita: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Wyandotte: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Edmonson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Henderson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Lewis: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Mercer: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Nelson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Ohio: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Pulaski: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Rockcastle: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Union: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Warren: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kentucky Whitley: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Louisiana Caddo: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Louisiana De Soto: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Louisiana Rapides: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Louisiana Saint Tammany: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Barnstable: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Bristol: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Phillips: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Ottawa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Osborne: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Osage: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Norton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Neosho: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Nemaha: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Morris: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Montgomery: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Miami: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas McPherson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Marshall: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Lyon: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Linn: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Lincoln: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Leavenworth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Labette: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Johnson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Jewell: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Harvey: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Greenwood: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Geary: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Franklin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Ford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Finney: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Douglas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Doniphan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Dickinson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Crawford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Cowley: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Cloud: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Clay: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Cherokee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Chautauqua: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Chase: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Butler: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Barton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Atchison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Anderson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Kansas Allen: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wyoming: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States Wisconsin: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Texas: Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. New York Botanical Garden, New York.
    • United States Texas: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • United States Texas: Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
    • United States Texas: Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
    • United States Texas: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Tennessee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina: Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
    • United States New York: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Nebraska: Kaul, R. B., S. B. Rolfsmeier & J. J. Esch. 1991. The distribution and reproductive phenology of the milkweeds (Asclepiadaceae: Asclepias and Cynanchum in Nebraska. Trans. Nebraska Acad. Sci. 18: 127–140.
    • United States Nebraska: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • United States North Dakota: Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
    • United States North Carolina: Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
    • United States Montana: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States Michigan: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Massachusetts: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • United States Massachusetts: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Massachusetts: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States Florida: Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. New York Botanical Garden, New York.
    • United States Florida: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • United States Florida: Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
    • United States Florida: Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
    • United States Florida: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Florida: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • Canada Saskatchewan: Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. New York Botanical Garden, New York.
    • Canada Saskatchewan: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • Canada Saskatchewan: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • Canada Ontario: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • Canada Ontario: Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • Canada Ontario: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • Canada Manitoba: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • Canada Manitoba: Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States Indiana White: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Wayne: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Warren: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Vermillion: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Tippecanoe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Steuben: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Starke: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Spencer: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Saint Joseph: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Pulaski: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Porter: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Perry: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Orange: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Noble: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Newton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Montgomery: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Miami: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Marshall: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Lake: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Lagrange: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana La Porte: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Kosciusko: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Knox: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Jasper: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Harrison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Gibson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Fulton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Elkhart: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Delaware: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Daviess: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Crawford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Clinton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Clark: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Cass: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Indiana Benton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Woodford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Will: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Vermilion: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Union: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Stark: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Saint Clair: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Richland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Putnam: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Pope: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Piatt: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Peoria: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Ogle: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Menard: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois McLean: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois McDonough: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Mason: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Madison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Macoupin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Macon: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Logan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Livingston: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Lee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois La Salle: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Knox: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Kankakee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Iroquois: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Hancock: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Ford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Fayette: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Effingham: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Edgar: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Douglas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois De Kalb: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Cook: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Christian: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Champaign: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Cass: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Carroll: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Bureau: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Illinois Adams: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Wright: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Woodbury: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Winneshiek: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Warren: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Wapello: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Van Buren: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Union: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Story: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Sioux: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Poweshiek: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Pottawattamie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Polk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Palo Alto: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Page: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa O'Brien: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Muscatine: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Monona: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Marshall: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Mahaska: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Madison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Linn: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Lee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Johnson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Ida: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Henry: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Harrison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Guthrie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Greene: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Floyd: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Fayette: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Emmet: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Dickinson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Des Moines: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Decatur: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Dallas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Crawford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Clinton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Clayton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Clay: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Chickasaw: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Cherokee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Cerro Gordo: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Carroll: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Boone: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Black Hawk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Iowa Allamakee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Thomas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Taylor: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Stephens: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Richmond: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Oglethorpe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Meriwether: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Long: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Jenkins: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Hall: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Fulton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Floyd: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia De Kalb: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Coweta: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Cobb: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Georgia Clarke: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Volusia: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Suwannee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Santa Rosa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Putnam: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Polk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Pasco: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Osceola: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Marion: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Manatee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Liberty: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Levy: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Leon: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Lee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Lake: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Hillsborough: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Hernando: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Gadsden: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Franklin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Duval: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Dixie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Dade: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Clay: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Citrus: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Florida Alachua: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Delaware Sussex: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Delaware New Castle: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Delaware Kent: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Connecticut New Haven: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Connecticut Hartford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Yell: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Washington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Scott: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Pulaski: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Prairie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Montgomery: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Miller: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Marion: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Johnson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Garland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Carroll: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Benton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Arkansas Baxter: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Alabama Tuscaloosa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Alabama Mobile: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Alabama Lee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Alabama Houston: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Alabama Barbour: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Colorado: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States Arizona: Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
    • United States Arizona: Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States : Kaul, R. B., S. B. Rolfsmeier & J. J. Esch. 1991. The distribution and reproductive phenology of the milkweeds (Asclepiadaceae: Asclepias and Cynanchum in Nebraska. Trans. Nebraska Acad. Sci. 18: 127–140.
    • United States : Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. New York Botanical Garden, New York.
    • United States : Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • United States : Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
    • United States : Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
    • United States : Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • United States : Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States : Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
    • Canada : Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. New York Botanical Garden, New York.
    • Canada : Small, J. K. 1933. Man. S.E. Fl. i–xxii, 1–1554. Published by the Author, New York.
    • Canada : Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
    • Canada : Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
    • Canada : Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
    • United States Massachusetts Franklin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Middlesex: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Norfolk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Plymouth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Massachusetts Suffolk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Maryland Baltimore: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Maryland Caroline: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Maryland Carroll: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Maryland Montgomery: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Michigan Kent: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Michigan Van Buren: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Becker: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Brown: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Chippewa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Clay: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Faribault: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Houston: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Kandiyohi: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Mower: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Nicollet: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Otter Tail: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Pope: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Ramsey: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Swift: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Minnesota Winona: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Atchison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Barry: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Barton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Boone: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Butler: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Cass: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Cedar: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Dent: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Franklin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Gentry: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Greene: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Hickory: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Holt: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Iron: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Jasper: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Jefferson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Knox: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Laclede: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Linn: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Madison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri McDonald: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Oregon: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Ozark: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Phelps: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Pike: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Pulaski: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Ralls: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Reynolds: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Saint Francois: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Saint Louis: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Saline: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Scotland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Stone: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Taney: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Washington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Missouri Worth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Mississippi Alcorn: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Mississippi Oktibbeha: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Alexander: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Ashe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Buncombe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Durham: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Forsyth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Granville: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Madison: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Montgomery: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Orange: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Polk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Randolph: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Rowan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Wake: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Carolina Wilkes: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Barnes: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Benson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Dickey: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Dunn: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Pierce: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Ransom: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Richland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States North Dakota Ward: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Antelope: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Cass: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Cherry: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Custer: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Dodge: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Douglas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Gage: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Holt: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Jefferson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Keith: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Knox: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Lancaster: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Lincoln: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Nemaha: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Nuckolls: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Otoe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Platte: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Red Willow: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Richardson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Sioux: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Washington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Nebraska Webster: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Atlantic: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Burlington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Camden: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Cape May: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Cumberland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Gloucester: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Passaic: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Salem: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New Jersey Somerset: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Albany: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Columbia: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Dutchess: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Nassau: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Niagara: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Rensselaer: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Rockland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Suffolk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States New York Ulster: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Adams: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Athens: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Clark: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Cuyahoga: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Erie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Fairfield: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Greene: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Lake: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Logan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Lucas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Meigs: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Ottawa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Ross: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Ohio Scioto: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Alfalfa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Cherokee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Cleveland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Comanche: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Craig: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Creek: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Garvin: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Grady: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Hughes: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Latimer: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Le Flore: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Logan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Major: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma McCurtain: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Muskogee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Oklahoma: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Ottawa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Payne: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Pottawatomie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Oklahoma Pushmataha: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Adams: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Berks: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Chester: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Delaware: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Lackawanna: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Lancaster: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Luzerne: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Monroe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Pennsylvania Pike: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Rhode Island Kent: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Rhode Island Providence: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Aiken: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Anderson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Beaufort: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Greenville: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Lancaster: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Carolina Lexington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Brookings: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Brule: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Charles Mix: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Clay: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Corson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Fall River: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Haakon: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Harding: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Kingsbury: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Pennington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Spink: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Stanley: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Walworth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States South Dakota Washabaugh: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Tennessee Anderson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Tennessee Cumberland: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Tennessee Davidson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Tennessee Knox: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Tennessee Rutherford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Anderson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Bastrop: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Bexar: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Brazos: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Cameron: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Cherokee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Dallas: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas De Witt: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Denton: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Fort Bend: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Galveston: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Gillespie: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Gregg: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Harris: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Jackson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Jeff Davis: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Milam: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Parker: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Presidio: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Rusk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Tarrant: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Travis: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Walker: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Wilson: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Texas Wood: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Arlington: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Bedford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Campbell: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Essex: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Greensville: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia James City: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Loudoun: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Louisa: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Mecklenburg: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Prince William: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Shenandoah: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Virginia Sussex: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Columbia: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Crawford: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Dane: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Grant: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Green: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Kenosha: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin La Crosse: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Lafayette: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Milwaukee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Ozaukee: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Sauk: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Sheboygan: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Trempealeau: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States Wisconsin Walworth: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Cabell: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Grant: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Hampshire: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Hardy: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Monroe: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Raleigh: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Summers: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
    • United States West Virginia Wayne: Woodson, R. E. 1954. The North American species of Asclepias L. Ann. Missouri Bot. Gard. 41(1): 1–211.
 
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