| Canada | | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| Canada | | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| Canada | Ontario | | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| Canada | Ontario | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| Canada | Ontario | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| United States | | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | | | Cronquist, A.J., A. H. Holmgren, N. H. Holmgren, J.L. Reveal & P. K. Holmgren | 1984 | Vascular Plants of the Intermountain West, U.S.A. | Intermount. Fl. | 4: 1–573 |
| United States | | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| 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 | Alabama | Cullman | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Alabama | Elmore | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Alabama | Franklin | 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 | Jackson | 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 | Mobile | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Alabama | Montgomery | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Arizona | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Arizona | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| United States | Colorado | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Connecticut | Fairfield | 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 | Connecticut | Middlesex | 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 | New London | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Connecticut | Tolland | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Connecticut | Windham | 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 | 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 | Sussex | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Florida | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| 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 | Holmes | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Florida | Nassau | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Georgia | Bibb | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Charlton | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Chatham | 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 | Georgia | Dade | 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 | Dougherty | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Effingham | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Fannin | 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 | Forsyth | 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 | Gwinnett | 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 | Heard | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Jefferson | 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 | Lamar | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Lincoln | 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 | Lowndes | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | McDuffie | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | McIntosh | 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 | Muscogee | 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 | Pickens | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Quitman | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Rabun | 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 | Stephens | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Terrell | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Union | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Walker | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | White | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Georgia | Wilkes | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Illinois | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Illinois | Williamson | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Kentucky | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Louisiana | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Maine | | Gleason, H. A. | 1968 | The Sympetalous Dicotyledoneae | Ill. Fl. N. U.S. (ed. 3) | vol. 3. 596 pp |
| United States | Maine | | Small, J. K. | 1933 | (none) | Man. S.E. Fl. | i–xxii, 1–1554 |
| United States | Maryland | Allegany | 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 | Cecil | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Maryland | Garrett | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Maryland | Harford | 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 | Maryland | Prince George's | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Maryland | Queen Anne's | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Maryland | Talbot | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Maryland | Wicomico | 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 | Berkshire | 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 | Massachusetts | Dukes | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Massachusetts | Essex | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| 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 | Hampden | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |
| United States | Massachusetts | Hampshire | 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 | Nantucket | 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 | Worcester | Woodson, R. E. | 1954 | The North American species of Asclepias L. | Ann. Missouri Bot. Gard. | 41(1): 1–211 |