1. usually unbranched usually spineless cactus covered with warty tubercles and having magenta flowers and white or green fruit; resembles the related mescal; northeastern Mexico and southwestern United States • Syn: Ariocarpus fissuratus • Hypernyms: cactus • Member Holonyms: Ariocarpus, genus Ariocarpus 2. highly succulent stemless clump-forming plants with grey-green leaves similar in texture to lumps of granite; South Africa • Syn: living granite, stone mimicry plant • Hypernyms: succulent • Member Holonyms: Pleiospilos, genus Pleiospilos