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Equisetum palustre
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Equisetum palustre : ウィキペディア英語版
Equisetum palustre

''Equisetum palustre'', the marsh horsetail or the humpback, is a plant species belonging to the division of horsetails (Equisetopsida).〔ITIS. 2009〕 It is widespread in cooler regions of North America and Eurasia.〔(Flora of North America, Marsh horsetail, prêle des marais, ''Equisetum palustre'' Linnaeus, Sp. Pl. 2: 1061. 1753. )〕〔(Flora of China, 犬问荆 quan wen jing ''Equisetum palustre'' Linnaeus )〕
== Description ==
''Equisetum palustre'' is a perennial cryptophyte, growing between 10 to 50 centimeters (4" to 20"), in rare cases up to one meter (3'). Its fertile shoots, which carry ears, are evergreen and shaped like the sterile shoots. The rough, furrowed stem is one to three mm in diameter with usually eight to ten ribs, in rare cases, four to 12. It contains whorled branches. The tight-fitting sheaths end in four to 12 teeth. The lower sheaths are dark brown and much shorter than the sheaths of the main shoot. The central and vallecular canals are about the same size, but the carinal channels are much smaller. The central channels measure about one sixth of the diameter of the stem.
The spores are spread by the wind (anemochory) and have four long ribbon-like structures attached to them. They sit on strobili which are rounded on the top. Marsh Horsetails often form subterranean runners and tubers, with which they also can proliferate vegetatively.

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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