Mapping will be based on a standard reference mark based on political units when available.
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North America
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United States
:
Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
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United States
:
Cronquist, A.J., A. H. Holmgren, N. H. Holmgren & Reveal. 1977. Vascular Plants of the Intermountain West, U.S.A. 6: 1–584. In A.J. Cronquist, A. H. Holmgren, N. H. Holmgren, J.L. Reveal & P. K. Holmgren (eds.) Intermount. Fl. Hafner Pub. Co., New York.