Cyperus lanceolatus

Poiret

in J. Lamarck et al., Encycl. 7: 245. 1806.

Illustrated
Synonyms: Cyperus densus Link Cyperus humboldtianus Schultes Cyperus lanceolatus var. compositus J. Presl & C. Presl Pycreus densus
Treatment appears in FNA Volume 23. Treatment on page 162. Mentioned on page 142.

Herbs, perennial, cespitose, rhizomatous. Culms trigonous, compressed, 15–75 cm × 0.5–3 mm, glabrous. Leaves 1–3, 5–30 cm × 1–2 mm. Inflorescences: spikes 1(–2), ovoid, 5–23 × 9–21 mm; rays 2–3(–4), 0–15 mm; if rays absent, head single, compact, sessile, (12–)15–20 mm diam.; bracts 2–3, horizontal to vertical, 2–14 cm × 0.5–3.5 mm. Spikelets 1–6, oblong-lanceoloid, 5–26 × 2–3 mm; floral scales 12–54, closely imbricate, laterally yellowish brown, medially pale brown, occasionally greenish, laterally 1-ribbed, medially 3-ribbed, distinctly 2-keeled basally, ovate, 1.8–2.6 × 1.4–1.7 mm, apex obtuse. Flowers: stamens 2; anthers 0.4–0.5 mm, connectives not prolonged; styles 0.3–1 mm; stigmas 0.6–0.8(–1) mm. Achenes brown, network of ridges forming isodiametric or square cells, stipitate, obovoid to ellipsoid, 1.1–1.3 × (0.5–)0.6 mm, apex acute to broadly rounded, surfaces minutely punctate or finely papillose.


Phenology: Fruiting summer.
Habitat: Marshes
Elevation: 0–100 m

Distribution

V23 258-distribution-map.jpg

Ala., Fla., Ga., La., Tex., Mexico, Central America, South America, Africa.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus lanceolatus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Poiret +
Undefined subg. Pycreus +
Ala. +, Fla. +, Ga. +, La. +, Tex. +, Mexico +, Central America +, South America +  and Africa. +
0–100 m +
Marshes +
Fruiting summer. +
in J. Lamarck et al., Encycl. +
Illustrated +
Cyperus densus +, Cyperus humboldtianus +, Cyperus lanceolatus var. compositus +  and Pycreus densus +
Cyperus lanceolatus +
Cyperus subg. Pycreus +
species +