Cyperus compressus
Sp. Pl. 1: 46. 1753.
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
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
"shortened" is not a number.