Common Scouring-rush, Common Scouring-rush, Scouring-rush Horsetail, Dutch Rush, Prairie Scouring-rush
Equisetum hyemale var. affine
Synonyms: Equisetum affine, Equisetum hyemale ssp. affine, Equisetum hyemale var. californicum, Equisetum hyemale var. pseudohyemale, Equisetum hyemale var. robustum, Equisetum praealtum, Equisetum robustum, Hippochaete hyemalis, Hippochaete hemalis ssp. affinis
Common scouring-rush as seen along Oregon Highway 218 about a mile south of Shaniko, OR.........May 14, 2010. Note the narrow black and broad white bands at each joint which helps identify this species.
Paul Slichter