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.
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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"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Linnaeus +
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 +
Various disturbed soils +
Fruiting summer–early fall. +
W2 +, W1 +  and Illustrated +
Cyperus compressus var. pectiniformis +, Cyperus pectinatus +  and Cyperus pectiniformis +
Cyperus compressus +
Cyperus subg. Cyperus +
species +