taxonomy

Needham, J.G. and M.J. Westfall, Jr. 1954. A Manual of the Dragonflies of North America (Anisoptera). University of California Press, Berkeley, California. 615 pp.

• morphology
• systematics
• taxonomy
• Crossosomataceae
• dragonfly

Hitchcock, A.S. 1951. Manual of the grasses of the United States. 2nd edition revised by Agnes Chase. [Reprinted, 1971, in 2 vols., by Dover Publications, Incorporated, New York.]

• key
• morphology
• taxonomy
• distribution
• GRASSES
• HABITAT

Heil, K.D., and J.M. Porter. 1994. Sclerocactus (Cactaceae): A revision. Haseltonia 2:20-46.

• taxonomy
• cacti
• conservation
• Sclerocactus

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.

• taxonomy
• Lepidoptera
• nomenclature
• NORTH AMERICA
• butterfly
• insect
• INSECTA

Waithman, J. and A. Roest. 1997. A taxonomic study of the kit fox, Vulpes macrotis. Journal of Mammalogy. 58:157-164.

• taxonomy
• McCartys lava flow
• fox
• kit fox

Rickett, H. W. 1973. Wild flowers of the United States: Vol. 6 (3 parts). The central mountains and plains. McGraw-Hill Book Company, New York. 784 pp. + plates.

• taxonomy
• wildflowers
• distribution
• HABITAT
• morphology

Flora of North America Editorial Committee (FNA). 1997. Flora of North America north of Mexico. Vol. 3. Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York. xxiii + 590 pp.

Hobbs, H. H., Jr. 1989. An Illustrated Checklist of the American Crayfishes (Decapoda: Astacidae, Cambaridae, and Parastacidae). Smithsonian Contributions to Zoology 480:1-236.

• distribution
• taxonomy
• crayfish

Pyle, R. M. 1981. The Audubon Society Field Guide to North American Butterflies. Alfred A. Knopf, New York, New York. 916 pp. + color plates.

• taxonomy
• life cycle
• morphology
• HABITAT
• distribution
• butterfly

Miller, L. D. and F. M. Brown. 1981. A Catalogue/Checklist of the Butterflies of America North of Mexico. The Lepidopterists' Society Memoir No. 2, Sarasota, Florida. 280 pp.

• taxonomy
• checklist
• history
• butterfly