Cotton-grass

cotton grass

noun
any rushlike plant constituting the genus Eriophorum, of the sedge family, common in swampy places and bearing spikes resembling tufts of cotton.

Origin:
1590–1600; so called from its cottonlike heads

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World English Dictionary
cotton grass
 
n
Also called: bog cotton any of various N temperate and arctic grasslike bog plants of the cyperaceous genus Eriophorum, whose clusters of long silky hairs resemble cotton tufts

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