found: Work cat.: Smith, M.A. Prescribed burning on Wyoming rangeland, 1985:p. 1 (Plains pricklypear cactus (Opuntia polyacantha))
found: Integrated Taxonomic Info. System, Jan. 27, 2000(Opuntia polyacantha. Common name: plains pricklypear. Synonyms: none)
found: The PLANTS database, via WWW, Jan. 27, 2000(Opuntia polyacantha Haw., plains pricklypear)
found: Brako, L. Scientific and common names of 7,000 vascular plants in the United States, 1995:p. 53 (Opuntia polyacantha, plains prickly-pear)
found: Scientific and common plant names and synonymy, state of Washington, 1983:sci. names, p. 18 (Opuntia polyacantha, plains pricklypear)
found: Everett, T.H. The New York Botanical Garden illustrated encyclopedia of horticulture, c1980-c1982:v. 7, p. 2407 (plains prickly-pear (O. polyacantha))