Opuntia engelmannii

Opuntia engelmannii is a prickly pear common across the south-central and Southwestern United States and northern Mexico. It goes by a variety of common names, including desert prickly pear, discus prickly pear, Engelmann's prickly pear in the US, and nopal, abrojo, joconostle, and vela de coyote in Mexico. The nomenclatural history of this species is somewhat complicated due to the varieties, as well as its habit of hybridizing with Opuntia phaeacantha. It differs from Opuntia phaeacantha by being green year round instead of turning reddish purple during winter or dry seasons, as well as having yellow flowers with red centers....read more on Wikipedia.