The Bonker hedgehog
is the rarest echinocereus in Arizona, found in a small area in the center of the state, between Payson and San Carlos Lake, and a little way south towards the Santa Catalina Mountains. The species is quite distinctive because of its short, bristly spines, different to most other, long-spined species; the 11 to 14 radials and 1 or 2 centrals are all about the same length, a third of an inch or less, and have brownish tips. The green stem is clearly visible beneath the spines, which are borne along distinct ribs, numbering between 12 and 18. The flowers are large, up to 4 inches across, colored deep pink with a yellow interior, while the fruits are red and spiny.
is the most similar species, but the ranges are different, and the spines of the Bonker hedgehog are noticeably thinner and more numerous.