Opuntia lindheimeri Opuntia lindheimeri Opuntia lindheimeri is s cactus which is treated by some botanists as a species separate and distinct from "O. engelmannii". Britton and Rose also considered that "O. lindheimeri" is a stand-alone species as did Engelmann who described it in 1850. The point is not settled, and other botanists accept "O. lindheimeri" as a variety of "O. engelmannii". Whatever their taxonomic relationship, the plants are easily distinguished when grown side-by-side and do not generally overlap in their natural ranges. Almost any large "Opuntia" in TX, NM, or AZ has probably been misidentified or misunderstood over the years, and "O.
Opuntia engelmannii (state) to the Tamaulipan matorral in Chihuahua (state), in Mexico. In the Sonoran Desert, terminal pads face predominantly east-west, so as to maximize the absorption of solar radiation during summer rains. Although found occasionally in the Mojave Desert, it tends to be replaced by "Opuntia basilaris", which does not need the summer rain. The overall form of "Opuntia engelmannii" is generally shrubby, with dense clumps up to high, usually with no apparent trunk. The pads are green (rarely blue-green), obovate to round, about 15–30 cm long and 12–20 cm wide. The glochids are yellow initially, then brown with age. Spines