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Dracaena (plant)

Dracaena is a genus of about 200–220 species of trees and succulent shrubs. The formerly accepted genera Pleomele and Sansevieria are now included in Dracaena. In the APG IV classification system, it is placed in the family Asparagaceae, subfamily Convallarioideae. It has also formerly been separated into the family Dracaenaceae or kept in the Agavaceae.

Description
Dracaena species can have two growth types: arborescent (tree- or shrub-like) dracaenas (e.g. Dracaena cinnabari, Dracaena draco, Dracaena fragrans), which have stout above-ground stems to around 20 metres tall that branch from nodes after flowering, or if the growth tip is severed; and rhizomatous dracaenas (e.g. Dracaena trifasciata, Dracaena angolensis), which have underground rhizomes and leaves on the surface, ranging from straplike to cylindrical. The arborescent species of Dracaena have a secondary thickening meristem in their trunks, termed Dracaenoid thickening by some authors, which is quite different from the thickening meristem found in dicotyledonous plants. This characteristic is shared with some members of the Agavoideae, Lomandroideae, and Xanthorrhoeoideae among other members of the Asparagales. ==Selected species==
Selected species
Dracaena aethiopica (Thunb.) Byng & Christenh. • Dracaena afromontana Mildbr. • Dracaena aletriformis (Haw.) Bos (syn. D. latifolia) • Dracaena americana Donn.Sm. – Central America dragon tree • Dracaena angolensis (Welw. ex Carrière) Byng & Christenh. • Dracaena angustifolia (Medik.) Roxb. • Dracaena arborea (Willd.) Link • Dracaena arborescens (Cornu ex Gérôme & Labroy) Byng & Christenh. • Dracaena aubrytiana (Carrière) Byng & Christenh. • Dracaena aurea H.Mann • Dracaena bagamoyensis (N.E.Br.) Byng & Christenh. • Dracaena ballyi (L.E.Newton) Byng & Christenh. • Dracaena braunii Engl. (syn. D. litoralis) • Dracaena cinnabari Balf.f. – Socotra dragon tree • Dracaena cochinchinensis (Lour.) S.C.Chen (syn. D. loureiroi) • Dracaena draco (L.) L. – Canary Islands dragon tree • Dracaena eilensis (Chahin.) Byng & Christenh. • Dracaena ellenbeckiana Engl. - Kedong Dracaena (Ethiopia, Kenya, Uganda) ==Uses==
Uses
Ornamental Some shrubby species, such as D. fragrans, D. surculosa, D. marginata, and D. sanderiana, are popular as houseplants. Many of these are toxic to pets, though not humans, according to the ASPCA among others. Rooted stem cuttings of D. sanderiana are sold as "lucky bamboo", although only superficially resembling true bamboos. Dracaena houseplants like humidity and moderate watering. They can tolerate periods of drought but the tips of the leaves may turn brown. Leaves at the base will naturally yellow and drop off, leaving growth at the top and a bare stem. Dracaena are vulnerable to mealybugs and scale insects. Other A naturally occurring bright red resin, dragon's blood, is collected from D. draco and, in ancient times, from D. cinnabari. Modern dragon's blood is, however, more likely to be from the unrelated Calamus rattan palms, formerly placed in Daemonorops. It also has social functions in marking graves, sacred sites, and farm plots in many African societies. ==Gallery==
Gallery
File:Socotra dragon tree.JPG|Dracaena cinnabari File:Dracaena draco (L.) L.jpg |Dracaena draco File:Dracaena ellenbeckiana - Jardín Botánico Canario Viera y Clavijo - Gran Canaria.jpg|Dracaena ellenbeckiana File:Colpfl26.jpg|Dracaena fragrans File:Dracaena reflexa.JPG|Dracaena reflexa File:LuckyBamboo 2005 SeanMcClean.jpg|Dracaena sanderiana File:Dracaena surculosa.jpg|Dracaena surculosa File:Dracaena tamaranae1.jpg|Dracaena tamaranae - native to Gran Canaria File:Snake_Plant_(Sansevieria_trifasciata)_with_fruit_1.jpg |Dracaena trifasciata ==References==
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