Kingcup Cactus (Echinocereus triglochidiatus Engelm.)

BONAP has mostly merged this into the Mojave kingcup cactus (Echinocereus mojavensis), with the exception of a few varieties that it considers part of other species. POWO, however, considers Echinocereus mojavensis to be a subspecies of this species, Echinocereus triglochidiatus subsp. mojavensis, ITIS considers them to be a single species under the name E. triglochidiatus, whereas the USDA and Tropicos consider them to be separate species. We are not sure what to do with this situation and for now have kept them separate, but note that this scheme may not make sense and we will update it if we get further information that one of these other treatments is superior.