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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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image of plant© Gary P. Fleming
image of plant© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG
image of plant© Aidan Campos source
image of plant© Alan Cressler: Equisetum hyemale, Morgan County, Alabama 1 by Alan Cressler source
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Alan Cressler: Equisetum hyemale subsp. affine, Spring Run, below Sinking Cove Cave, Sinking Cove, Franklin County, Tennessee 1 by Alan Cressler source
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Erik Danielson source | Original Image ⭷
image of plant© Alan Cressler: Equisetum hyemale, Calf Creek Canyon, Calf Creek Recreation Area, Grand Staircase-Escalante National Monument, Garfield County, Utah 1 by Alan Cressler source

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