Columbia Sedge
Carex aperta
Synonym: Carex accedens

Close-up of the perigynia of Columbia sedge as seen along the upper shoreline along Mirror Lake, Rooster Rock State Park............October 8, 2012.
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Close-ups of the inflorescence of Columbia sedge as seen along the upper shoreline along Mirror Lake, Rooster Rock State Park............October 8, 2012.
Paul Slichter