Carex elata, probably atrata.

The curving shore is clearly traced by a ribbon of white sand upon which the ripples play; then comes a belt of broad-leafed sedges, interrupted here and there by impenetrable tangles of willows; beyond this there are groves of trembling aspen; then a dark, shadowy belt of Two-leaved Pine, with here and there a round carex meadow ensconced nest-like in its midst; and lastly, a narrow outer margin of majestic Silver Fir 200 feet high.