File Size: 70 KB
Scirpus atrovirens  Willd.
Konza Prairie, Riley County, Kansas
Height: 3 to 5 feet
Family: Cyperaceae - Sedge Family
Flowering Period:   June, July
Also Called: Dark green bulrush, gray-head bulrush.
Culms: Erect, solitary or several, slender, somewhat 3-sided.
Leaves: Blades 4-9, mostly on lower 1/2 of culms, well-developed, to 4/5 inch wide, dark green; margins rough; lower leaf blades and sheaths cross-partitioned.
Inflorescences: Panicle-like, open or compact, usually twice-branched, terminal, consisting of dense, nearly spherical clusters of 8-20 spikelets borne at ends of rays; bracts several, leaf-like, often exceeding inflorescences.
Spikelets: Egg-shaped, brown, less than 1/2 inch long; flowers perfect; scales elliptic, dark green, turning brownish black or lead-gray with age; tips abruptly short-pointed; bristles 6, at bases of flowers, barbed, shorter than or slightly longer than achenes; stamens 3; styles 3-cleft.
Fruits: Achenes, egg-shaped, flattened to 3-angled, pale brown, 1-seeded.
Habitat: Marshes, wet meadows, ditches, and stream edges.
Distribution: Throughout Kansas.
Uses: Native Americans and pioneers used the roots for food. Waterfowl eat the seeds.
Comments: When mature, the inflorescences shatter if the plant is disturbed, scattering the achenes.

Green bulrush inflorescence
93 KB
Konza Prairie, Riley County, Kansas
Green bulrush spikelets
82 KB
Konza Prairie, Riley County, Kansas
Green bulrush
77 KB
Konza Prairie, Riley County, Kansas
Mature green bulrush
102 KB
Konza Prairie, Riley County, Kansas