Cylindropuntia acanthocarpa var. thornberi
Cactaceae 1: 184. 1958.
Shrubs, with few-to-many branches, at acute and obtuse angles. Stem segments gray-green, 10–25 (–50) cm; tubercles very prominent and broad, 2.5–4.5 cm. Spines 6–11 (–14) per areole, rarely interlacing with spines of adjacent areoles, yellow to deep redbrown, aging gray, not baggy sheathed; major abaxial spines usually deflexed and spreading. Flowers: inner tepals yellow to bronze. Fruits bearing few spines, sometimes spineless; areoles 12–20.2n = 22.
Phenology: Flowering mid-late spring (Apr–Jun).
Habitat: Sonoran and Mojave deserts, desert grasslands, chaparral transition areas, rocky hills, ridges
Elevation: 600-1500 m