Equisetum praealtum 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); = Equisetum hyemale L. ssp. affine (Engelm.) Calder & R.L.Taylor – AqW, Ar, ETx1, FNA2, Il, Meso1, NE, NY, Tn, TxFerns, Va, Lin et al (2013); = Equisetum hyemale L. var. affine (Engelm.) A.A.Eaton – C, Fl1, GrPl, K1, K3, 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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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW (name change)
• Eastern Mountains and Piedmont: FACW (name change)
• Great Plains: FACW (name change)
• Midwest: FACW (name change)
• Northcentral & Northeast: FAC (name change)

Heliophily ?: 5