Many-spiked Cottongrass, Tall Cottongrass: Eriophorum angustifolium ssp. angustifolium (Synonyms: Eriophorum angustifolium var. coloratum, Eriophorum angustifolium ssp. scabriusculum, Eriophorum polystachion)
Chamisso's Cottongrass, 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, Eriophorum russoleum)
Slender Cottongrass: Eriophorum gracile (Synonyms: Eriophorum gracile var. caurianum, Eriophorum gracile var. gracile)
Thinleaf Cottonsedge, Tassel Cottongrass: Eriophorum viridicarinatum (Synonyms: Eriophorum latifolilum, Eriophorum latifolium var. viridicarinatum)