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Dracaena (plant)
''Dracaena'' (, derived from the romanized form of the Ancient Greek – ''drakaina'', "female dragon") is a genus of about 40 species of trees and succulent shrubs. In the APG III classification system, it is placed in the family Asparagaceae, subfamily Nolinoideae (formerly the family Ruscaceae). It has also formerly been separated (sometimes with ''Cordyline'') into the family Dracaenaceae or placed in the Agavaceae (now Agavoideae). The majority of the species are native to Africa, with a few in southern Asia and one in tropical Central America. The segregate genus ''Pleomele'' is now generally included in ''Dracaena''. The genus ''Sanseviera'' is closely related, and has recently been synonymized under ''Dracaena'' in the Kubitzki system.
==Description==
Species of ''Dracaena'' have a secondary thickening meristem in their trunk, which is quite different from the thickening meristem found in dicotyledonous plants and is termed dracaenoid thickening by some authors. This characteristic is shared with members of the Agavoideae and Xanthorrhoeoideae among other members of the Asparagales.
''D. americana'', ''D. arborea'', ''D. cinnabari'', ''D. draco'', ''D. ombet'', and ''D. tamaranae'' are commonly known as dragon trees and grow in arid semi-desert areas. They are tree-sized with stout trunks and stiff, broad-based leaves. The remaining species are known collectively as shrubby dracaenas. They are smaller and shrub-like, with slender stems and flexible strap-shaped leaves, and grow as understorey plants in rainforests.
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