The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
• Cronquist, A., A. H. Holmgren, N. H. Holmgren & J. L. Reveal. 1972. Vascular Plants of the Intermountain West, U.S.A. 1: 1–271. In A. J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermount. Fl. Hafner Pub. Co., New York.
• Farjon, A. K., J. A. Pérez de la Rosa & B. T. Styles. 1997. Field Guide Pines Mexico Central America 1–147. Royal Botanic Gardens, Kew.
• Flora of North America Editorial Committee, e. 1993. Pteridophytes and Gymnosperms. 2: i–xvi, 1–475. In Fl. N. Amer. Oxford University Press, New York.
• Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
• Hitchcock, C. L., A. Cronquist, M. Ownbey & J. W. Thompson. 1969. Vascular Cryptogams, Gymnosperms, and Monocotyledons. 1: 1–914. In Vasc. Pl. Pacific N.W. University of Washington Press, Seattle.
• Moss, E. H. 1983. Fl. Alberta (ed. 2) i–xii, 1–687. University of Toronto Press, Toronto.
• Porsild, A. E. & W. Cody. 1980. Vasc. Pl. Continental Northw. Terr. Canada i–viii, 1–607. National Museum of Natural Sciences, Ottawa.
• Scoggan, H. J. 1978 [1979]. Pteridophyta, Gymnospermae, Monocotyledoneae. 2: 93–545. In Fl. Canada. National Museums of Canada, Ottawa.
• Welsh, S. L. 1974. Anderson's Fl. Alaska Adj. Parts Canada i–xvi, 1–724. Brigham Young University Press, Provo.