cotton rush

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Noun1.cotton rush - any sedge of the genus Eriophorumcotton rush - any sedge of the genus Eriophorum; north temperate bog plants with tufted spikes
sedge - grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers
common cotton grass, Eriophorum angustifolium - having densely tufted white cottony or downlike glumes