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Equisetum praealtum Rafinesque. Tall Scouring-Rush, River Scouring-Rush. Phen: May-Sep. Hab: Riverbanks, alluvial floodplains. Dist: Widespread in North America 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: = Sf, Tat, Christenhusz et al (2019); = Equisetum hyemale L. ssp. affine (Engelm.) Calder & R.L.Taylor – Ar, ETx1, FNA2, FoC, Il, Meso1, NE, NY, Tn, TxFerns, Va; = Equisetum hyemale L. var. affine (Engelm.) A.A.Eaton – C, Fl1, GrPl, K1, K3, K4, Md, Mo1, Pa, RAB, Tx, W, WH3; = Hippochaete hyemalis (L.) Bruhin ssp. affinis (Engelm.) W.A.Weber; < Equisetum hyemale L. – S13; > Equisetum hyemale L. var. affine (Engelm.) A.A.Eaton – F, WV; > Equisetum hyemale L. var. elatum (Engelm.) Morton – G, WV; > Equisetum hyemale L. var. pseudohyemale (Farw.) Morton – G; > Equisetum hyemale L. var. robustum (A.Braun) A.A.Eaton – F

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