Vascular Plants - Equisetaceae - Equisetum:
Equisetum sylvaticum
Page Author: Don Knoke
woodland horsetail, wood horsetail 
Habit: herb
Duration: perennial
Origin: Native
Distribution: Alaska to Washington, east across southern Canada and northern United States to the Atlantic Coast
Habitat: Shady coniferous forests, bog edges and swamps
Species Description:

General: Rhizomatous annual, the stems dimorphic, the sterile ones 3-7 dm. tall, 10- to 18-ridged, the central cavity more than 1/2 the diameter of the stem; stomates in 2 bands in the furrows; sheaths of the sterile stems 4-12 mm. long, green, the teeth 2-7 mm. long, cohering in several broad, brown, papery lobes. Fertile stems appearing earlier than the sterile, usually with longer teeth and sheaths, at first simple and pale, becoming branched and green.
Leaves: Branches whorled, solid, 4- to 5-angled, usually again branched, spreading to recurved, very slender, about 0.5 mm. thick.
Spores: Cone deciduous, long-peduncled, blunt.
Accepted Name:
Equisetum sylvaticum L.
Synonyms:
(none)

Treated in Flora of the PNW as:
Equisetum sylvaticum
Additional Resources:

PNW Herbaria Specimens: View list of all Equisetum sylvaticum specimens in the Consortium of Pacific Northwest Herbaria database.

WTU Herbarium Specimens: View list of Equisetum sylvaticum specimens in the WTU Herbarium database.

Washington Flora Checklist: Equisetum sylvaticum treatment.

E-Flora BC: Equisetum sylvaticum atlas page.

CalPhotos: Equisetum sylvaticum images.

USDA Plants Database: Equisetum sylvaticum.
Additional photographs of Equisetum sylvaticum:
(click on a thumbnail to view larger photo)

Ben Legler, 2004

Ben Legler, 2004

Ben Legler, 2004

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Bud Kovalchik

Craig Althen, 2010

Craig Althen, 2010
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Washington Native Plant Society
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