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Eleocharis equisetoides : ウィキペディア英語版 | Eleocharis equisetoides
''Eleocharis equisetoides'', with common names including Horsetail spike-rush, jointed spike-rush, spikesedge, and knotted spike-rush, is a species native to the United States and Ontario, usually in freshwater wetland areas. It is known primarily from the Atlantic coastal plain from Texas to Massachusetts, and the Great Lakes region, with scattered populations elsewhere.〔(Flora of North America v 23 p 120 )〕〔(Biota of North America Program 2013 county distribution map )〕〔(Kew World Checklist of Selected Plant Families )〕 ''Eleocharis equisetoides'' and the related ''E. interstincta'' have hollow stems with complete transverse septa. This gives them a jointed appearance superficially resembling the stems of some species of ''Equisetum''. The two species can be distinguished by the length of the perianth bristles subtending the achenes.〔〔Torrey, John. Annals of the Lyceum of Natural History of New York 3: 296. 1836.〕〔Elliott, Stephen. Sketch of the Botany of South-Carolina and Georgia 1(1): 79. 1816.〕 ==References==
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