Man are content to grow them alone in preference to all other cacti

Of the sixteen genera in this subtribe two are outstanding, Mammiitaria (mam-ee-Jay'-ree-ah) and Coryphantha (koh-ree-fan'-tha). They are distinguished from other members of the Cereus tribe in having lines of tubercles or nipples (mamillae) instead of ribs, and from the other members of the Cactus family in having the spine-producing and flower-producing centers of their areoles separated. In the genus Mammillaria. for example, the flowers do not arise from the spiny areole which lips each tubercle, but from a generally hairy or woolly areole which lies between the older tubercles at the top of the plant. In other genera, such as Coryphantha.

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