Cyperus gracilis

R. Brown

Prodr., 213. 1810.

Treatment appears in FNA Volume 23. Mentioned on page 186.

Herbs, annual or perennial. Culms weak, often arching, basally culmlike, weakly 4 (–5) -angled, 10–30 cm × 0.2–0.4 mm, glabrous. Leaves 1–4, 3–25 cm × 1–1.5 mm. Inflorescences: rays absent, often proliferous; bracts 2–4, longest erect, looking like continuation of culm, V-shaped, 3–6 cm × 1–3 mm. Spikelets 1–3 (–6), narrowly ellipsoid, weakly compressed, 5–10 × 2 mm; floral scales 8–16, laterally whitish or dull stramineous, medially green, weakly 3–4-ribbed, broadly ovate, 2.5 × 2 mm, apex acute to mucronate, mucro slightly excurved, 0.2–0.3 mm. Flowers: stamens 3; styles 0.8 mm; stigmas 1–1.3 mm. Achenes brown, stipitate, obovoid, abaxial angle more prominent than adaxial ones, 0.7 × 0.7 mm, apex emarginate, surfaces glabrous.


Phenology: Fruiting summer–early fall.
Habitat: Disturbed, moist areas
Elevation: 0–100 m

Distribution

V23 245-distribution-map.jpg

Introduced; Calif., Australia

Discussion

Carex gracilis comprises diminutive plants with a delicate, arching habit and distinctive knoblike angles to the achenes.

Selected References

None.

Lower Taxa

None.

... more about "Cyperus gracilis"
0.7 cm7 mm <br />0.007 m <br /> (?) +
0.7 cm7 mm <br />0.007 m <br /> (?) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
R. Brown +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
v--shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
scabridulous +
4(-5)-angled +
0.2mm;0.4mm +
Calif. +  and Australia +
0–100 m +
green +, stramineous +, dull +  and whitish +
2.5 cm25 mm <br />0.025 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (?) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Disturbed, moist areas +
digitate +, glomerulate +  and umbellate +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
3cm +  and 25cm +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
excurved +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–early fall. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
unequal +
proliferous +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
compressed;ellipsoid +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
2-3-fid +
0.8 cm8 mm <br />0.008 m <br /> (?) +
Cyperus subg. Protocyperus +
Cyperus gracilis +
Cyperus subg. Pycnostachys +
species +
tuberous +, stoloniferous +  and rhizomatous +
perennial +  and annual +