Oregon Flora Image Project
Equisetum arvense L. common horsetail - native
Equisetaceae

Click on an image for a larger version. All images Gerald D. Carr unless otherwise noted.

In this species, ephemeral, unbranched, non-green shoots produce terminal spore-bearing cones in early spring; the highly branched, sterile green shoots persist through the growing season.  Rarely, as seen in the last two images, the green shoots may produce rudimentary terminal cones.

Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010 Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010 Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010
Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010 Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010 Bog at head of Quartzville Cr., S side of NFD Rd. 11, 9.7 mi. W of jct. with Hwy 22, 4080 ft. elev., N44.57447, W122.12259, Linn Co., OR, 6/7/2010 Along Sherman Creek, off Hwy 20, 13 mi. W of Kettle Falls, 2440 ft. elev., Ferry Co., WASHINGTON, 5/17/2010, ( Robert L. Carr) Along Sherman Creek, off Hwy 20, near the jct of the N & S Forks, W of Kettle Falls, 2460 ft. elev., Ferry Co., WASHINGTON, 8/27/2010 ( Robert L. Carr)
NFD Rd. 25, ca. 18 mi. S of Randle, Skamania Co., WASHINGTON, 8/5/1996 NFD Rd. 25, ca. 18 mi. S of Randle, Skamania Co., WASHINGTON, 8/5/1996 NFD Rd. 25, ca. 18 mi. S of Randle, Skamania Co., WASHINGTON, 8/5/1996 NFD Rd. 25, ca. 18 mi. S of Randle, Skamania Co., WASHINGTON, 8/5/1996

 


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