Cyperus ochraceus

Vahl

Enum. Pl. 2: 325. 1805.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 155. Mentioned on page 143, 153.

Herbs, perennial, cespitose; rhizomes oblique. Culms roundly trigonous, 20–50 (–80) cm × 1–3 mm, glabrous. Leaves 3–11, V-shaped, 12–40 cm. Inflorescences: heads loosely to rather densely hemispheric, 15–30 mm diam.; rays 5–10, 2–12 cm; 2d order rays occasionally produced, 5–25 mm; bracts 4–8, approximately horizontal to ascending at 30°, V-shaped, 10–36 cm × 1.5–4 mm, margins glabrous. Spikelets (4–) 10–30, greenish, grayish, or stramineous, oblong to linearoblong, compressed, (5–) 7–10 (–35) × 2–3 mm; floral scales 10–25 (–85), laterally yellowish-brown, medially yellowish or brownish, laterally ribless, medially 2-ribbed with groove between ribs, broadly ovate (widest in proximal 1/2), (1.2–) 1.5–2 × 1.2–2 mm, apex obtuse (declined (45–) 60–90º from rachilla). Flowers: stamen 1; anthers oblong, 0.8–1.2 mm, connective not prolonged; styles basally thickened, confluent with summit of achene, 0.6–1.2 mm; stigmas 0.3–0.6 mm. Achenes reddish-brown to dark purplish brown, dull or more often iridescent, stipitate, broadly ellipsoid, 1–1.5 mm × 0.4–0.6 (–0.7) mm, base cuneate to ± attenuate, stipe 0.1–0.2 mm, apex acute, beak 0.1–0.5 mm, surfaces reticulate with network of low ridges.


Phenology: Fruiting summer.
Habitat: Damp, disturbed soils, ditches, marshes
Elevation: 0–200 m

Distribution

V23 240-distribution-map.jpg

Fla., Ga., La., Miss., Pa., Tex., Mexico, Central America, South America

Discussion

In Pennsylvania, Cyperus ochraceus has been recorded in areas where ballast has been discarded.

Selected References

None.

Lower Taxa

None.
... more about "Cyperus ochraceus"
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
brown +, reddish-brown +  and dark purplish +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
ellipsoid +
0.4mm;0.6mm +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
shortened +
persistent +  and deciduous +
cuneate +  and more or less attenuate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
10 cm100 mm <br />0.1 m <br /> (36 cm360 mm <br />0.36 m <br />) +
approximately horizontal +  and ascending +
v--shaped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
not prolonged +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
scabridulous +
trigonous +
1mm;3mm +
Fla. +, Ga. +, La. +, Miss. +, Pa. +, Tex. +, Mexico +, Central America +  and South America +
0–200 m +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
brownish +, yellowish +  and yellowish-brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp, disturbed soils, ditches, marshes +
digitate +, glomerulate +  and umbellate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
hemispheric +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
v--shaped +
12 cm120 mm <br />0.12 m <br /> (40 cm400 mm <br />0.4 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
unequal +
5 +  and 10 +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
stramineous +, grayish +  and greenish +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
10 +  and 30 +
compressed;oblong +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (?) +  and 0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +
2-3-fid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Cyperus subg. Protocyperus +
Cyperus ochraceus +
Cyperus subg. Pycnostachys +
species +
tuberous +, stoloniferous +  and rhizomatous +
herb +  and cespitose +