Most members of the Echeveria tribe are exceptionally easy and rugged plants, requiring only (he simplest culture. While they will tolerate almost any soil, they grow best when given a fairly rich humus mixture with good drainage and ample water. Free ventilation and light indoors will prevent the plants becoming weak or drawn, and summering out of doors will ensure good form and foliage. Species with smooth leaves do best in full sun; those with hairy leaves prefer some shade. Although a few species such as the common Hen and Chickens can survive below-zero temperatures, most members of the Echeveria tribe are fairly tender to frost and should be protected from freezing in winter Propagation is easily accomplished with offsets formed by clustering species; stem cuttings of shrubby species; leaf cuttings of certain small species such as Echeveria amoena; or plantlets formed on the flower stalks of several large species, as E\ gihbiftora. Seeds are virtually useless or propagating any particular species, because unless pollination is carefully controlled members of this tribe hybridize freely among themselves, producing innumerable variants.
The Kalanchoe Tribe. Am hough they comprise a relatively small group of plants in cultivation, with fairly distinct characteristics . members of this fourth tribe of the Crassula family are perhaps the most confused in nomenclature. Actually there are three distinct genera in this tribe: the genus Kalanchoe (kal-an-koh'-ee), which is characterized by erect flowers; the genus Bryophyllum (bry-oh-fi'-lum), with pendent flowers and leaves that often produce plantlets along their margins; and the genus Kitchingia (ki-ching'-ee-ahj, whose pendeni flowers resemble the bryophyliums. but can be differentiated by having anthers which are attached to the upper part of the flower petals and wide-spreading ovaries. In botanical literature, however, these three generic names have been used almost interchangeably, and now one may find them all simply listed as Kalanchoe-
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