Cyperus eragrostis

Lamarck in J. Lamarck and J. Poiret
in J. Lamarck and J. Poiret, Tabl. Encycl. 1: 146. 1791.
Illustrated
Synonyms: Cyperus vegetus Willdenow
Treatment appears in FNA Volume 23. Treatment on page 154. Mentioned on page 143, 153, 180.

Herbs, perennial, cespitose, rhizomatous. Culms trigonous to terete, (25–)40–60(–90) cm, glabrous. Leaves flat or V-shaped, (10–)25–50 cm × 5–8(–12) mm. Inflorescences: heads globose, (10–)20–40 mm diam.; rays (0–)3–10, 2.5–5(–12) cm; 2d order rays usually absent (when present, 0.5–1.5 cm); bracts 4–8, horizontal to ascending at 15–30°, flat (or V-shaped), 3–30(–50) cm × 1.5–8(–12) mm. Spikelets (20–)30–50(–70), oblong, compressed, 5–20 × 2.2–3 mm; floral scales (12–)20–30(–50), off-white to golden brown, basally 2-keeled, laterally ribless, ovate-deltate, 2–2.3 × 1–1.4 mm (declined 30–40º from rachilla). Flowers: stamen 1; anthers 1–1.2 mm; styles 1–1.2 mm; stigmas 0.5 mm. Achenes black or dark brown, stipitate, broadly ellipsoid, 1.2–1.4 × 0.5–0.6 mm, stipe to 0.1 mm, apex apiculate, beak 0.2–0.3 mm, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Damp grasslands, roadsides ditches
Elevation: 0–200 m

Distribution

V23 238-distribution-map.jpg

B.C., Ala., Calif., La., Miss., N.J., Oreg., Pa., S.C., Tex., Wash., South America, naturalized, Europe.

Discussion

The distributions of Cyperus eragrostis in British Columbia, Alabama, Pennsylvania, South Carolina, and Texas represent introduced populations.

Selected References

None.

Lower Taxa

None.

... more about "Cyperus eragrostis"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Lamarck in J. Lamarck and J. Poiret +
B.C. +, Ala. +, Calif. +, La. +, Miss. +, N.J. +, Oreg. +, Pa. +, S.C. +, Tex. +, Wash. +, South America +, naturalized +  and Europe. +
0–200 m +
Damp grasslands, roadsides ditches +
Fruiting summer. +
in J. Lamarck and J. Poiret, Tabl. Encycl. +
Illustrated +
Cyperus vegetus +
Cyperus eragrostis +
Cyperus subg. Pycnostachys +
species +