Crassulaceae, the stonecrop family, is a group of succulent plants, mostly small, some shrub-like, generally with thick, undivided leaves (often in basal rosettes), and branched clusters of small flowers. The US has 117 species in 18 genera, most numerous, and geographically widespread, being crassula, dudleya and sedum. Other species are mostly limited, in the West, to desert and coastal areas. Flowers have 4 or 5 sepals, an equal number of petals and either the same number of stamens or twice as many.