Fringed Cottongrass: Calliscirpus criniger (Synonyms: Eriophorum criniger, Eriophorum crinigerum, Scirpus criniger)
Mny-spike Cottongrass, Many-spiked Cottongrass, Tall Cottongrass: Eriophorum angustifolium ssp. angustifolilum (Synonym: Eriophorum polystachion)
Chamisso's Cottongrass, Chamisso's Cotton-grass, Russet Cottongrass: Eriophorum chamissonis (Synonyms: Eriophorum altaicum, Eriophorum altaicum var. neogeum, Eriophorum chamissonis var. aquatile, Eriophorum rufescens, Eriophorum russeolum, Eriophorum russeolum ssp. rufescens, Eriophorum russeolum var. albidum, Eriophorum russeolum var. leucothrix, Eriophorum russeolum var. majus)
Slender Cottongrass: Eriophorum gracile (Synonyms: Eriophorum gracile var. caurianum, Eriophroum gracile var. gracile)
Tawny Cottongrass: Eriophorum virginicum