Arroyo Pricklypear

Griffiths, Proceedings of the Biological Society of Washington 27(6): 26, 1914 Herbarium (submitted as O.  engelmannii); Herbarium (O. riparia-like) Original Description What is Opuntia riparia? Opuntia riparia is a pricklypear cactus that grows in low, wide thickets in southern Arizona. It rarely reaches waist-high, but occasional cactus stems may reach to 3-4 ft tall.  Details […]