(Engelmann) Britton & Rose, Smithsonian Miscellaneous Collections 50: 529, 1908
Opuntia littoralis was described as a variety of O. engelmannii by Engelmann, but the two species are not closely related. The plants are low and spreading, but they send branches upright as well. The oblong cladodes are 6-inches long or longer. Areoles may be elevated. Spines are yellow or pale yellow and may be 1/2-inch long or longer. O. littoralis areoles have multiple pale spines over much of the pad surface giving it a shaggy look. The fruit is nearly globular. O. littoralis is found “along and near” the coast of CA. The type locality is “coast from Santa Barbara to San Diego, California.” See the original citation. Opuntia littoralis may be hexaploid.