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Equisetum hyemale L.

Rough Horsetail
Equisetaceae

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Protologue: Sp. Pl.: 1062 (1753)
Pronunciation: E-qui-sè-tum hy-e-mà-le
Etymology: equus, horse + seta, bristle + L. hyemale, of the winter, flowering in winter

Note: Equisetum hyemale L. subsp. affine (Engelm.) Calder & Roy L. Taylor occurs in our region.

Jepson eFlora Treatment

Jepson eFlora Key to Equisetum

SD County Synoptic Voucher

Distribution:
 
Left: S.D. County Plant Atlas (http://sdplantatlas.org). Right: CCH2. Click to see current herbarium records. 

 
 
Equisetum hyemale
Note large, clonal population, aerial shoots arising from underground rhizomes.
Differs from E. laevigatum in having leaf sheaths with two dark bands and rougher (scabrous) stem surfaces. Cone (strobilus) tip is pointed.
(iNat observations 240658177, 63999180, & 55091253. Courtesy of Ron Vanderhoff & Jon Rebman)

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