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Equisetumpraealtum Rafinesque. Tall Scouring-Rush, River Scouring-Rush. Phen: May-Sep. Hab: Riverbanks, alluvial floodplains. Dist: Widespread in North America, and south to s. Mexico and El Salvador.
Origin/Endemic status: Native
Taxonomy Comments: As interpreted by Christenhusz et al. (2019), American material often treated as synonymous or varietally or subspecifically distinct from Eurasian E. hyemale warrants specific recognition, based on morphology and molecular phylogeny.
Synonymy ⓘ: = K4, Sf, Tat, Christenhusz et al (2019); = Equisetumhyemale L. ssp. affine (Engelm.) Calder & R.L.Taylor – AqW, Ar, ETx1, FNA2, Il, Meso1, NE, NY, Tn, TxFerns, Va, Lin et al (2013); = Equisetumhyemale L. var. affine (Engelm.) A.A.Eaton – C, Fl1, GrPl, K1, K3, Md, Mo1, Pa, RAB, Tx, W, WH3; = Hippochaetehyemalis (L.) Bruhin ssp. affinis (Engelm.) W.A.Weber; < Equisetumhyemale L. – S13; > Equisetumhyemale L. var. affine (Engelm.) A.A.Eaton – F, WV; > Equisetumhyemale L. var. elatum (Engelm.) Morton – G, WV; > Equisetumhyemale L. var. pseudohyemale (Farw.) Morton – G; > Equisetumhyemale L. var. robustum (A.Braun) A.A.Eaton – F
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Horticultural Information
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Height:2-5 ft.
plant sale text:Scouring rush (commonly called rough horsetail) is evergreen, the masses of its stems appearing very dark green in winter. It forms dense clonal colonies, and is often found in wet woods, moist hillsides and the sides of water bodies. Keep in mind that it is best to plant tall scouring-rush in a container as it has the tendency to spread to form large colonies in the wild. The rough bristles have a high silica content and were used to scour or clean pots, hence the common name of scouring rush. These unique plants are living relics from an age millions of years before the dinosaurs existed!
