Titanopsis calcareum (concrete leaf), native to South Africa, forms rosettes to 3″ in diameter with semi-flattened paddle-shaped leaves densely covered with grayish-green tubercles. Tips of leaves are very warty in appearance. This peculiar succulent is one of the plants considered mimicry plants, nearly undetectable in its native habitat due to its cryptic coloring and rough texture that effectively mimics rocks and the surrounding environment. Light yellow daisy-like flowers with many petals. In its native habitat, Titanopsis calcareum often grows in rocky quartz fields in soils with high limestone content. Some frost tolerance, but it is advisable to protect from frost to prevent possible scarring.