Page author: Don Knoke
Equisetum fluviatile
or river horsetail, swamp, water
WTU specimens
Other herbaria

Distribution: Alaska to Oregon, east across southern Canada and the northern tier of states in the United States.

Habitat: Shallow water, marshes and bogs, along muddy shores, from the lowlands to moderate elevations in the mountains.

Origin: Native

Conservation Status: Not of concern

Description:
General:

Rhizomatous annual, the stems not dimorphic, up to 1 m. tall, shallowly 9- to 25-ridged and grooved, the ridges smooth; stomata in a single broad band in each furrow; central cavity large, more than 3/4 the diameter of the stem; sheaths green, 4-9 mm. long, with persistent, sharp, black teeth 1.5-3 mm. long.

Leaves:

Branches none to many and whorled, 4- to 6-angled, simple, the first internode shorter than the stem sheath.

Spores:

Cone short-pedunculate, blunt, deciduous.

Accepted Name:
Equisetum fluviatile L.
Publication: Sp. Pl. 2: 1062. 1753. 1753.

Synonyms & Misapplications:
Equisetum limosum L. [Peck]
Additional Resources:

PNW Herbaria: Specimen records of Equisetum fluviatile in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Equisetum fluviatile checklist entry.

E-Flora BC: Equisetum fluviatile atlas page.

CalPhotos: Equisetum fluviatile photos.

USDA Plants: Equisetum fluviatile information.

21 photographs:
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