Northern Prairie Wildlife Research Center
Green Bulrush (Scirpus atrovirens)
- Family: Sedge (Cyperaceae)
- Flowering: May-September.
- Field Marks: The flower clusters are subtended by several leaflike bracts, the stems are not sharply triangular, and the bristles in each flower are rarely longer than the achenes.
- Habitat: Along streams, around ponds and lakes, roadside ditches.
- Habit: Perennial herb with short, thick rhizomes.
- Stems: Erect, triangular, smooth, up to 4 1/2 feet tall.
- Leaves: Elongated, narrow, dark green, rough along the edges, up to 1/2 inch broad.
- Flowers: Borne in spikelets with several spikelets in clusters, some of the clusters sessile, others on long stalks, subtended by 2-4 leafy bracts.
- Scales: Narrow, tapering to rough awns, up to 1/16 inch long, brown, green-brown, or brown-black.
- Sepals: 0.
- Petals: 0.
- Stamens: 3.
- Pistils: Styles 3-cleft; ovary superior.
- Fruits: Achenes ellipsoid, triangular, pale brown, up to 1/20 inch long.
- Notes: The achenes are eaten by waterfowl.
Previous Species -- Olney's Bulrush (Scirpus americanus)
Return to Species List -- Group 3
Next Species -- Woolgrass (Scirpus cyperinus)