living rock

(noun) 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. Synonyms: living rock, Ariocarpus fissuratus.

(noun) highly succulent stemless clump-forming plants with grey-green leaves similar in texture to lumps of granite; South Africa. Synonyms: living granite, living rock, stone mimicry plant.