Smooth Horsetail, Smooth Scouring Rush
Synonyms: Equisetum funstonii, Equisetum kansanum, Equisetum laevigatum ssp. funstonii, Hippochaete laevigata
Smooth scouring-rush as seen in moist soils along the road through Ochoco Forest Camp, Ochoco National Forest........May 29, 2016.
The photo above shows the black-tipped teeth
atop a sheath of smooth scouring-rush as seen in moist soils along an irrigation
canal along the Willard Springs Trail at Conboy Lake National Wildlife Refuge..........July
28, 2006. The sheaths at each joint do not have a black band below the teeth
as in some other horsetails. Note also that the number of teeth is the same
as the number of ribs at the sheath.
Smooth scouring-rush as seen in a dry stream bed meandering across prairie adjacent to Lakeside Rd in Conboy Lake NWR.........August 10, 2007. Note that the sheaths are banded with black only along the upper edge.
Smooth scouring-rush as seen in a meandering
stream in the middle of Swampy Meadows at the southwest corner of Mt. Adams...........August