What is "sedges"

Usage examples of "sedges".

After great ecstasy, along the plains, What foulest impregnation of her sight Transformed the scene to multitudinous troops Of human sketches, quaver-figures, bent, As were they winter sedges, broken hoops, Dry udder, vineless poles, worm-eaten posts, With features like the flowers defaced by deluge rains?

SONG IN THE SONGLESS They have no song, the sedges dry, And still they sing.