USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Aquatic and Wetland Vascular Plants of the Northern Great Plains

1. Equisetaceae, the Horsetail Family

1. Equisetum L. -- Horsetail, scouring rush

7. Equisetum sylvaticum L. -- Wood horsetail

Stems dimorphic, annual, erect. Sterile stem green, densely branched from the nodes, 3-7 dm tall, mostly 10- to 18-ridged, the ridges usually with silicaceous spicules; central cavity usually more than 1/2 the stem diameter; main stem sheaths 5-10 mm long, the teeth coherent in usually 3-5 broad lobes, reddish-brown, 3-5 mm long. Branches rebranched, spreading to recurved, 4- or 5-angled. Fertile stems as in E. pratense, except usually having rebranched rather than simple branches; sheaths 10-25 mm long, the teeth fused into reddish-brown lobes 4-15 mm long. Cones as in E. pratense. Wet or swampy woods; uncommon; ne ND, ne SD and the Black Hills; (Circumboreal, in N.Amer. s to MD, WV, KY, IA, SD, nw MT, n ID and s B.C.).
GIF- Distribution Map

Map key

Previous Species -- Equisetum pratense Ehrh. -- Meadow horsetail
Return to Family -- Equisetaceae - The Horsetail Family

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:42:44 EST
Sioux Falls, SD [sdww55]