Engelmann, Proceedings of the American Academy of Arts and Sciences 3: 290, 1856
Opuntia strigil occurs in west TX, mostly west of the Pecos River and apparently not entering NM. It grows on limestone hills from 2500 to 4500 ft, but also on creosote flats in the Texas trans-Pecos area. The plants are distinctive in habit, forming sturdy shrubs to 3-ft tall and perhaps as wide composed of nearly circular cladodes. There are 5 to 8(10) spines per areole with many deflexed but some nearly erect. Centrals may be 1/2- to 1 1/2-inches long. Fruits are red and nearly spherical. The Flora of North America online reports, “Opuntia strigil is reminiscent of a [small] brown-spined form of O. chlorotica.” Read the original description. Opuntia strigil is diploid.