Opuntia chlorotica var santa-rita Griffiths & Hare, New Mexico Agricultural Experiment Station: Bulletin 60: 64, 1906
Opuntia chlorotica var santa-rita is often treated as a stand-alone species (see treatment by Britton and Rose) but it is considered to be a variety of Opuntia chlorotica herein as it was when first described. Britton and Rose describe the flowers as very handsome, deep yellow and 2.5 to 3.5 inches across. The cladodes are typical circular or nearly so; and the plant forms 1 or more distinct trunks; cladodes may be spineless or may have a few spines at the tip of their tips. The filaments and style are white; the the stigma is white or yellow-white. It is not found in the colder northern locations (eg, southern Nevada or northern Arizona) or higher altitudes where Opuntia chlorotica var chlorotica is found. Britton and Rose report that the type locality is the Solera Mts of Arizona. Opuntia chlorotica santa-rita is diploid. Read the original description.