Orostachys is a genus of the succulent family Crassulaceae (stonecrop family) that contains about 15 species. It is a biennial herb growing in China, Japan, Korea, Mongolia, Russia. Eight species occur in China. Orostachys spinosa (Chinese Dunce Cap, Dunce Cap, Spiny Pennywort) is a small, slow-growing succulent that forms rosettes of thick fleshy grey-green leaves with soft white spiny tips. This species is native to the arid areas in Mongolia, Russia, China. The plant is remarkably hardy, and able to photosynthesize under a thin layer of snow. Orostachys spinosa show amazing symmetry of the rosette, the leaf pattern follows a Fibonacci sequence. Orostachys spinosa is used in Mongolian herbal medicine, and in decorative rock gardens.
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