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Concept
Crassulaceae
Summary
The Crassulaceae ('kraesju:leIsi:%i:,_-si%aI, from Latin crassus, thick), also known as the stonecrop family or the orpine family, are a diverse family of dicotyledon flowering plants characterized by succulent leaves and a unique form of photosynthesis, known as Crassulacean acid metabolism (CAM). Flowers generally have five floral parts. Crassulaceae are usually herbaceous but there are some subshrubs, and relatively few treelike or aquatic plants. Crassulaceae are a medium size monophyletic family in the core eudicots, among the order Saxifragales, whose diversity has made infrafamilial classification very difficult. The family includes approximately 1,400 species and 34–35 genera, depending on the circumscription of the genus Sedum, and distributed over three subfamilies. Members of the Crassulaceae are found worldwide, but mostly in the Northern Hemisphere and southern Africa, typically in dry and/or cold areas where water may be scarce, although a few are aquatic.
Crassulaceae are mainly perennial and have economic importance as garden plants. Many members have a bizarre, intriguing appearance, and are quite hardy, typically needing only minimal care. Familiar species include Crassula ovata (jade plant or friendship tree), Kalanchoe blossfeldiana (florists' kalanchoe), Sempervivum (houseleek or hen and chicks), Monanthes, Umbilicus (pennywort), Bryophyllum, Echeveria and Cotyledon.
General: Crassulaceae is a family of morphologically diverse terrestrial perennial, rarely annual or hapaxanthic (flowering once in a lifetime), flowering plants that demonstrate xerophytic adaptations, with thick succulent leaves, a thick waxy cuticle and Crassulacean acid metabolism. Crassulaceae are generally herbaceous but there are some subshrubs, and relatively few treelike, epiphytic (growing on surface of plants), scandent (vine like) or aquatic plants. Most species are herbaceous leaf succulents, with regular 5 part (pentamerous or fivemerous) flowers, isomerous free carpels and one or two whorls of stamens.
Official source
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