Echinocereus rigidissimus (Engelm.) Rose in Contr. U.S. Natl. Herb. 12: 293. 1909
Echinocereus rigidissimus in Contr. U.S. Natl. Herb. 12: 293. 1909
is new combination for Cereus pectinatus var. rigidissimus in Proc. Amer. Acad. Arts 3: 279. 1856
Echinocereus rigidissimus in Contr. U.S. Natl. Herb. 12: 293. 1909