San Mateo Canyon, nr Fisherman's Camp, 9-5-11. © Ron Vanderhoff

Smooth horsetail
(Smooth scouring rush)

Equisetum laevigatum

Native to much of North America except for northern Canada and southern Mexico.

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San Mateo Canyon, nr Fisherman's Camp, 9-5-11. © Ron Vanderhoff
Rice Canyon, E Santa Ana Mts., 7-5-12. © Ron Vanderhoff

San Juan Creek, old bridge to 2.2 mi E, 9-18-11. © Ron Vanderhoff
San Juan Creek, old bridge to 2.2 mi E, 9-18-11. © Ron Vanderhoff