Twist-spine Pricklypear

Engelmann & J.M. Bigelow, Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean 4(5; 3): 41 (1857 publ. 1856) Isolectoype; Herbarium; Herbarium; Herbarium; Herbarium; Herbarium; Herbarium; Herbarium (submitted as O. aff polyacantha); Herbarium; Herbarium; Herbarium; Herbarium; Herbarium; Herbarium (submitted as O. polyacantha); […]