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Orchidaceae
Orchidaceae is a diverse and widespread family of flowering plants, with blooms that are often colourful and often fragrant, commonly known as the orchid family. Along with the Asteraceae, they are one of the two largest families of flowering plants. Orchidaceae has about 27,800 currently accepted species, distributed in about 880 genera.〔(【引用サイトリンク】title=WCSP ) (See ''External links'' below).〕 The determination of which family is larger is still under debate, because verified data on the members of such enormous families are continually in flux. Regardless, the number of orchid species nearly equals the number of bony fishes and is more than twice the number of bird species, and about four times the number of mammal species. The family also encompasses about 6–11% of all seed plants. The largest genera are ''Bulbophyllum'' (2,000 species), ''Epidendrum'' (1,500 species), ''Dendrobium'' (1,400 species) and ''Pleurothallis'' (1,000 species).
The family also includes ''Vanilla'' (the genus of the vanilla plant), ''Orchis'' (type genus), and many commonly cultivated plants such as ''Phalaenopsis'' and ''Cattleya''. Moreover, since the introduction of tropical species into cultivation in the 19th century, horticulturists have produced more than 100,000 hybrids and cultivars.
==Description==
Orchids are easily distinguished from other plants, as they share some very evident shared derived characteristics, or "apomorphies". Among these are: bilateral symmetry of the flower (zygomorphism), many resupinate flowers, a nearly always highly modified petal (''labellum''), fused stamens and carpels, and extremely small seeds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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