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ceroid cactus : ウィキペディア英語版
ceroid cactus

The term ceroid cactus (or sometimes just cereus) is used to describe any of the species of cacti with very elongated bodies, including columnar growth cacti and epiphytic cacti.〔〔
The name is from the Latin ''cēreus'', wax taper (slender candle), referring to the stiff, upright form of the columnar species.〔 Entry ‘cereus’〕 Some species of ceroid cacti were known as torch cactus or torch-thistle, supposedly due to their use as torches by Native Americans in the past.〔: "any of several columnar cacti of the genus ''Cereus'' whose stems were used by No. American Indians for torches."〕
The genus ''Cereus'' was first genus for such cacti and one of the oldest cactus genera. Its circumscription varies depending on the authority.
According to Cactiguide the word "cereus" was commonly and freely used to describe any tree-like cacti, although this general use of the word is regarded as misleading and the word ceroid or ceriform is preferred.〔
==Taxonomy==
The name ''cereus'' originates in a book by Tabernaemontanus published in 1625 and refers to the candle-like form of species ''Cereus hexagonus''. Regularly having been described by Philip Miller in 1754, and included all known cacti with very elongated bodies.
Ludwig Pfeiffer in 1838 divided ''Cephalocereus'' (type ''Cephalocereus senilis''), the name is derived from the Greek cephale, head, thus headed cereus, referring to the hairy pseudocephalium.
Charles Lemaire described ''Pilocereus'' in 1839, now is renamed as ''Pilosocereus''. The name ''Pilocereus'' is derived from the Greek pilos, felted, hairy, thus hairy cereus, similar to the Latin pilosus, from which the name ''Pilosocereus'' was derived. Genus ''Echinocereus'' (type ''Echinocereus viridiflorus'') was described in 1848 by George Engelmann, the name is derived from the Greek echinos, hedgehog or sea urchin. Britton & Rose (1919-1923) and Alwin Berger (1929) continued to divide ''Cereus'' into many genera.
In 1984 a new approach to cactus classification was begun. The International Organization for Succulent Plant Study (IOS) found a working group called the International Cactaceae Systematics Group. The group has involved specialists in morphology and anatomy and experts in botanical research as electron microscopy, pollen studies, chromosomes, chemistry, and DNA analysis. Specialists in various groups of cacti have been included, or their comments solicited. The results was presented by Anderson 2001.

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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