Common Scouring-rush, Common Scouring-rush, Scouring-rush Horsetail, Dutch Rush, Prairie Scouring-rush: Equisetum hyemale ssp. affine (Synonyms: Equisetum hyemale var. affine, Equisetum hyemale var. californicum, Equisetum praealtum)

The photo at left shows a close-up of the fertile stalk of common scouring-rush as seen along the Springwater Trail east of Palmblad Road to the east of Gresham, OR.......April , 2011. Note the apiculate (pointed cap) tip to the cone. The photo at right shows a close-up of a joint of common scouring-rush as seen along the Springwater Trail east of Palmblad Road to the east of Gresham, OR..........April , 2011. The sheath at the lower portion of the joint typically has a lower black band, then a lighter band, and then is topped with another blackish band (a characteristic of this species).

Additional close-up photos of common scouring-rush with the foliage a bit fresher than seen in the photos above. Photographed along the western banks of the Deschutes River about one-half mile upstream from its confluence with the Columbia River........July 27, 2011.