Equisetum hyemale ssp. affine

(Common Scouring-rush)

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Equisetum hyemale ssp. affine, Paonia, Delta Co. 8517

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Equisetum hyemale ssp. affine, FR 265, Gunnsion Co. 8405

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Equisetum hyemale ssp. affine, FR 265, Gunnsion Co. 8406

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E. hyemale on right, FR 265, Gunnsion Co. 8411

Scientific Name Equisetum hymale ssp. affine USDA PLANTS Symbol EQHYA
Common Name Common Scouring-rush, Scouring-rush Horsetail ITIS Taxonomic Serial No. 525635
Family Equisetaceae (Horsetail) SEINet
Reference
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Description Life zones and habitat: Plains to montane (3500 to 10000 ft.); moist, open areas, streamsides.
Plant: Annual 8 inches to more than 6 feet tall; unbranched stems with discernible ridges and distinct nodes.
Leaves: Grayish sheath at each node comprised of "leaves" with pointed tips; black band around the top and another black band just below.
Inflorescence: Single, brown, cone-shaped spore-producing structure (strobilus) atop each stem; conical shape with pointed tip.
Bloom Period: Spring to early summer.
References: Wildflowers of the Southern Rocky Mountains, and SEINet.
BONAP Distribution Map

Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County