This cactus is native subspecies of the green-flowering hedgehog cactus and is common from mid-to-high elevations, favoring volcanic soils. The cylindrical stem of this cactus may branch to form large colonies. Rusty-red flowers with darker purplish maroon midstripes and greenish-yellow anthers grow from the middle third of the stem and do not open very wide. Found in the United States only in Brewster County in the Big Bend area of Texas, these were found growing below the Chisos Mountains near the Rio Grande.