Cyperus haspan
Sp. Pl. 1: 45. 1753.
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
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
"shortened" is not a number.