Opuntia occidentalis var. covillei (Britton & Rose) Parish, Man. Fl. Pl. Calif.: 657. 1925 Opuntia occidentalis var. covillei (Britton & Rose) Parish, Man. Fl. Pl. Calif.: 657. 1925Taxon for this nameOpuntia occidentalis var. covillei (Britton & Rose) Parish