Echinomastus unguispinus var. durangensis (Runge) Bravo in Cact. Suc. Mex. 25: 65. 1980
Echinomastus unguispinus var. durangensis in Cact. Suc. Mex. 25: 65. 1980
is new combination for Echinocactus durangensis in Hamburger Garten- Blumenzeitung 56: 231. 1890