nomenclature
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Weber, W.A. 1987. Colorado flora: Western slope. Colorado Associated University Press. Boulder. 530 pp.
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Opler, P., Research associate, and A.D. Warrren. 2002. Butterflies of North America 2. Scientific names list for butterfly species of North America, north of Mexico. . 79 p.
Flora of North America Editorial Committee. 1997. Flora of North America north of Mexico. Vol. 3. Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York. xxiii + 590 pp.