Cyperus haspan

Linnaeus

Sp. Pl. 1: 45. 1753.

Illustrated
Synonyms: Cyperus autumnalis Vahl Cyperus haspan subsp. juncoides (Lamarck) Kükenthal Cyperus haspan var. americanus Boeckeler Cyperus juncoides
Treatment appears in FNA Volume 23. Treatment on page 151. Mentioned on page 150.

Herbs, perennial, cespitose, shortly rhizomatous. Culms trigonous, (2–)25–60(–100) cm × 1–4 mm, soft (flattened in drying), glabrous. Leaves usually reduced to sheaths, occasionally with blades, flat to V-shaped, (3–)10–30 cm × (1–)2.5–5 mm. Inflorescences: heads loosely digitate; rays (5–)10–12(–15), 1–15(–20) cm; 2d order rays usually present, (1–)6–12(–25) mm; 3d order rays sometimes present, 1–6 mm; bracts 2(–3), horizontal to ascending at 30–60°, longer (3–)6–18 cm × 2–4 mm, shorter (0.5–)2.5–6.5 cm × 1–2(–3) mm. Spikelets 1–15, linear-lanceoloid, ± compressed-quadrangular, 3–18 × 1–1.6 mm; floral scales 10–20(–40), laterally reddish to greenish brown, dull, often clear-edged, medially greenish, laterally 1-ribbed, medially 1-ribbed, oblong to obovate, 1–1.5(–1.9) × 0.8–1 mm, apex mucronate, glabrous except for cluster of crystalline prickles at apex. Flowers: stamens 3; anthers 0.3–0.5 mm; styles 0.4–0.9 mm; stigmas 0.5–0.8(–1.3) mm. Achenes white or reddish brown, stipitate, globose to obovoid or ellipsoid, 0.5–0.6(–0.7) × 0.3–0.4(–0.5) mm, base nearly cuneate, stipe 0.1 × 0.1–0.2 mm, apex obtuse to acute, apiculate or entire, surfaces granular to papillose.


Phenology: Fruiting summer.
Habitat: Swales between dunes, marshes, pond shores
Elevation: 0–200 m

Distribution

V23 231-distribution-map.jpg

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex., Va., Mexico, Central America, South America, Asia, Africa, Australia.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus haspan"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Linnaeus +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +, Va. +, Mexico +, Central America +, South America +, Asia +, Africa +  and Australia. +
0–200 m +
Swales between dunes, marshes, pond shores +
Fruiting summer. +
Illustrated +
Cyperus autumnalis +, Cyperus haspan subsp. juncoides +, Cyperus haspan var. americanus +  and Cyperus juncoides +
Cyperus haspan +
Cyperus subg. Pycnostachys +
species +