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"
dark-brown +  and black +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
ellipsoid +
0.5mm;0.6mm +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Lamarck in J. Lamarck and J. Poiret +
shortened +
persistent +  and deciduous +
decurrent +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
3 cm30 mm <br />0.03 m <br /> (30 cm300 mm <br />0.3 m <br />) +
horizontal +  and ascending +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
scabridulous +
trigonous +  and terete +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
B.C. +, Ala. +, Calif. +, La. +, Miss. +, N.J. +, Oreg. +, Pa. +, S.C. +, Tex. +, Wash. +, South America +, naturalized +  and Europe +
0–200 m +
off-white +  and golden brown +
0.2 cm2 mm <br />0.002 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
ovate-deltate +  and 2-keeled +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp grasslands, roadsides ditches +
digitate +, glomerulate +  and umbellate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
globose +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
25cm +  and 50cm +
v--shaped +  and flat +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
in J. Lamarck and J. Poiret, Tabl. Encycl. +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
unequal +
3 +  and 10 +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
30 +  and 50 +
compressed;oblong +
2.2mm;3mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
0 cm0 mm <br />0 m <br /> (?) +  and 0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +
2-3-fid +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Cyperus vegetus +
Cyperus eragrostis +
Cyperus subg. Pycnostachys +
species +
herb +  and cespitose +