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Cistanche
''Cistanche'' is a worldwide genus of holoparasitic desert plants in the family Orobanchaceae. They lack chlorophyll and obtain nutrients and water from the host plants whose roots they parasitize.
==Uses==
Along with other members of the genus, ''Cistanche deserticola'' is the primary source of the Chinese herbal medicine cistanche (Chinese: 肉苁蓉, pinyin ròucōngróng). The main sources of cistanche are ''Cistanche salsa'' and ''Cistanche deserticola'', although it may also be obtained from ''Cistanche tubulosa'', ''Cistanche sinensis'', and ''Cistanche ambigua''. The drug, known in Chinese as ''suosuo dayun'', is collected in spring before sprouting, by slicing the stems of the plant. ''Cistanche deserticola'' has been placed on CITES Appendix 2, a list of endangered species not banned from trade but requiring monitoring. With increased consumption of cistanche, the population of the species has decreased and its area of distribution has shrunk. Aside from over-collection or indiscriminate collection, an important factor in the diminished supply of cistanche is a loss of the saxaul host, ''Haloxylon ammodendron'', which is widely used for firewood.
Cistanche has been used as a medicine for about 1800 years and is recorded in the ''Shennong Bencao Jing'' and ''Bencao Gangmu'' as a tonic. Most of the medicinal claims have never been evaluated through clinical testing, and those claims that have been examined under controlled medical study are not supported.〔C.Z. Zhang, S.X. Wang, Y. Zhang, J.P. Chen, X.M. Liang. 2005. In vitro estrogenic activities of Chinese medicinal plants traditionally used for the management of menopausal symptoms. Journal of Ethnopharmacology 98: 295-300.〕
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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