hairs along their margins, form cushions of dense rosettes thai close up like bulbs during their summer resting period Of the single rosette forms none is more curious than A. tabu-laeforme; which makes an absolutely flat rosette a fool or more in diameter consisting of hundreds of closely imbricated green leaves. Equally stunning is the huge A. canariense, whose broad, spoon-shaped leaves are covered with velvety while hairs and form a single rosette nearly two feet in diameter Bui the finest of them all is the magnificent A, nobilt\ whose broad, fleshy, olive-green leaves form a rosette twenty inches across topped by an immense head of coppery scarlet flowers.
Of the other lender African genera belonging to the Sem-pervivum tribe only one is at all common in succulent collections, the genus Greenovta (gree-no'-vee-ah) li consists of four species, all native to mountainous regions of the Canary Islands and ail closely related to the aeoniums. They are neat little clustering rosette plants with thin, spoon-shaped, waxy green leaves and brigh! yellow spring flowers Ordinarily they would not excite much attention, but they have one curious habit that makes them irresistible During their resting period in the hot summer months they pull up their leaves to form a tight cylinder which looks for all the world like a half-open rosebud, hence their popular name, Green Rosebuds The iwo most widely grown species are G aureaf with blue-green clustered rosettes tip to five inches in diameter; and G\ dodren-talis, with much smaller gray-green rosettes that form dense, cushion-like mats.
All members of the Sempervivum tribe are of ihe easiest culture, requiring only the minimum caie given anv succulents. The lender aeoniums and greenovias must, of course, be protected from frost in winter; but the hardy sempervivum s need no pro lection except perhaps a thin covering oí leaves or litter in the coldest areas. Unfortunately the propagation of some of these plants is complicated by the fact that
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