GENUS ASTROPHYTUM Subfamilia Cactoideae, tribus Cacteae. The name Astrophytum is derived from the Greek aster, star, and phyton, plant (Star Cactus). The type species is A.myriostigma. The species come from northern Mexico (Chihuahuan Desert), except A.asterias which has some extent to Texas,USA. The genus Astrophytum contains only 6 species. The plants are globular when young with a small number of ribs that are prominent and covered this white scales and flecks. Their flowers are in summer, yellow, followed by a hairy fruit. Although easy to grow, they are sensitive to root rot and should be watered with caution. They need mineral based alkaline, porous soil with limestone added, very draining and little organic matter. Most species will take some frost. Here I follow The New Cactus Lexicon (2006) for Astrophytum names. SPECIES LIST 1 A.asterias 2 A.capricorne 3 A.caput-medusae 4 A.coahuilense 5 A.myriostigma 6 A.ornatum
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