Cyperus compressus

Linnaeus

Sp. Pl. 1: 46. 1753.

Illustrated
Synonyms: Cyperus compressus var. pectiniformis (Roemer & Schultes) C. B. Clarke Cyperus pectinatus Roemer & Schultes Cyperus pectiniformis
Treatment appears in FNA Volume 23. Treatment on page 171. Mentioned on page 144, 145.

Herbs, annual, cespitose with fibrous-roots. Culms trigonous, (2–) 6–15 (–35) cm × (0.3–) 1–1.8 mm, glabrous. Leaves 1–5, flat to V-shaped, (1–) 5–15 (–22) cm × (0.5–) 1.5–3 mm. Inflorescences: spikes ± digitate, ± globose, 7–40 × 10–20 mm; rays (0–) 1–6, 2–12 cm; if absent, inflorescence a sessile cluster of (1–) 3–10 spikelets; rachis 2–5 mm; bracts (1–) 4–5 (–6), ascending, V-shaped, 1–15 (–20) cm × 0.5–3.5 mm; rachilla persistent, wingless. Spikelets (1–) 3–12 (–16), greenish white, linear to linear-lanceoloid, compressed-quadrangular, 6–34 (–40) × 2–3 (–3.6) mm; floral scales deciduous, (8–) 16–36 (–42), spreading, laterally whitish, greenish, or pale brownish, medially green, weakly 7–9-ribbed, laterally weakly 1–2-ribbed, most ribs medial, ovate, (2.4–) 2.6–3 × (1.9–) 2–2.4 (–2.5) mm, apex acute to ± acute, cuspidate tip (0.3–) 0.5–0.7 (–0.8) mm. Flowers: anthers 0.6–0.7 mm; styles 0.9–1.3 mm; stigmas 0.5–0.8 mm. Achenes brown, stipitate to sessile, obovoid, (1–) 1.2–1.4 (–1.5) × 0.9–1 (–1.1) mm, apex obtuse to emarginate, surfaces very finely puncticulate.


Phenology: Fruiting summer–early fall.
Habitat: Various disturbed soils
Elevation: 0–900 m

Distribution

V23 281-distribution-map.jpg

Ala., Ark., Del., Fla., Ga., Ill., La., Md., Miss., Mo., N.Y., N.C., Ohio, Pa., S.C., Tex., Va., Mexico, Central America, South America, Asia, Africa

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus compressus"
stipitate +  and sessile +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.9mm;1mm +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Linnaeus +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
v--shaped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
scabridulous +
trigonous +
1mm;1.8mm +
Ala. +, Ark. +, Del. +, Fla. +, Ga. +, Ill. +, La. +, Md. +, Miss. +, Mo. +, N.Y. +, N.C. +, Ohio +, Pa. +, S.C. +, Tex. +, Va. +, Mexico +, Central America +, South America +, Asia +  and Africa +
0–900 m +
1-2-ribbed +  and 7-9-ribbed +
green +, pale brownish +, greenish +  and whitish +
hypogynous +  and subtending +
biconvex +  and trigonous +
Various disturbed soils +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
15 cm150 mm <br />0.15 m <br /> (22 cm220 mm <br />0.22 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
5cm +  and 15cm +
flat +  and v-shaped +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 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 (?) +
conspicuous +
unequal +
1 +  and 6 +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
2mm;2.4mm +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
W2 +, W1 +  and Illustrated +
0.7 cm7 mm <br />0.007 m <br /> (4 cm40 mm <br />0.04 m <br />) +
globose +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
3.4 cm34 mm <br />0.034 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
greenish white +
0.6 cm6 mm <br />0.006 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
3 +  and 12 +
compressed-quadrangular;linear;linear-lanceoloid +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
2-3-fid +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Cyperus compressus var. pectiniformis +, Cyperus pectinatus +  and Cyperus pectiniformis +
Cyperus compressus +
Cyperus subg. Cyperus +
species +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
tuberous +, stoloniferous +  and rhizomatous +
herb +  and cespitose +