Ariocarpus (Aria-like fruit). Cactaceae. Ton- shaped succulent desert plants, mostly buried in the ground, the broad aerial part covered with angular tubercles bearing no spines: fls. from the center of the plant, large, white or pink: fr. small, naked; seeds black, roughened.—A genus of 6 or 7 species confined to Cent. Mex., except a single species in S. W. Texas. A very distinct genus, easily distinguished from Mamillaria by its tubercles.
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