Echinocereus rigidissimus subs. rubispinus is one of the local form of Echinocereus rigidissimus. It distinguishes for the very short dusty red-purple spines (not pink and white) and dull purple-red (not green) stigma lobes. It is also up to 50% smaller in all its parts. Its blossoms are bright magenta red and are large and showy in comparison with the small size of the stem.