| − | Echinocactus viridescens. Nutt. Globose or depressed, simple or branching at base, 4-12 in. high, 6-10 in. diam.: ribs 13-21 (fewer when young), compressed and scarcely tuberculate: spines more or less curved and sometimes twisted, reddish below, shading into greenish or yellowish above; radials 9-20, ⅖-⅘ in. long, the lowest shortest, robust, and decurved; centrals 4, cruciate, much stouter, compressed and 4-angled, ⅘-1⅖ in. long, the lowest broadest, longest and straightest: fls. yellowish green, about 1⅗ in. long. S. Calif.—E. limitus, Engelm., is closely related to this species and is thought by some to be identical with it.
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