these divided centers are joined by a pronounced groove on the upper side of each young tubercle, from the base of which the flowers arise. The mammillarias may be further distinguished because half their species possess normal watery sap and the other half a milky sap—a feature not found in any other member of the Cactus family.
Most of the nearly three hundred species of MammiUaria are native to Mexico, with a scattering of species in our Southwest, Central America, and the Caribbean. Thev range from the seashore to eight thousand feet, growing exposed on high mesas, beneath desert shrubs, on sheer canyon walls, and in rocky washes. Some are solitary plants, others form clusters or great mounds containing hundreds of plants. They vary in size from liny globular plants an inch high to cylindrical forms a foot high, bui ail of them are delightfully neat, compact plants. The beautiful colors of their spines (white, yellow, red, black, or gray), in a variety oi intricate patterns (straight, hooked, feathery, silky, or starred), vie with the bright circle of tiny flowers which crown the plants and ripen into brilliant fruit. And, to top it all, t^e mammillarias are of the easiest culture, ideal miniature cacti for the crowded win* dow sill, greenhouse, or succulent border
Of the hundreds of species available, almost all of which are desirable, a few universal favorites must be mentioned Two delightful miniature species are the Thimble Cactus. M fragilis, which bears at the top of iLs thimble-sized cylindrical body a profusion of baby plants; and M. elongate, a tiny columnar plant, branching from the base, whose clusters of bright yellow radial spines have won for it the familiar name Golden Stars. Equally popular are several species with feathery or silky spines. The Powder Puff Cactus, M. bocasana. is a dainty globular plant with sofi. fluffy white hair, creamy flowers, and tiny bright red fruit. Somewhat similar is the very beautiful Feather Cactus. M. plumosa, whose feathery white spines completely cover the plant. The Silken Pincush-
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