Cyperus haspan |
Cyperus subg. Pycnostachys |
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haspan flatsedge |
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Habit | Herbs, perennial, cespitose, shortly rhizomatous. | |
Culms | trigonous, (2–)25–60(–100) cm × 1–4 mm, soft (flattened in drying), glabrous. |
and leaves with non-Kranz anatomy (C3). |
Leaves | usually reduced to sheaths, occasionally with blades, flat to V-shaped, (3–)10–30 cm × (1–)2.5–5 mm. |
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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. |
spikes; rachilla persistent, wingless. |
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. |
borne in digitate clusters (rarely singly) or in umbellate or glomerulate heads; floral scales deciduous, 2-keeled or folded (conduplicate). |
Flowers | stamens 3; anthers 0.3–0.5 mm; styles 0.4–0.9 mm; stigmas 0.5–0.8(–1.3) mm. |
stamens 1–3; stigmas 3. |
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. |
trigonous, plano-convex, or terete. |
Cyperus haspan |
Cyperus subg. Pycnostachys |
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Phenology | Fruiting summer. | |
Habitat | Swales between dunes, marshes, pond shores | |
Elevation | 0–200 m (0–700 ft) | |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; VA; Mexico; Central America; South America; Asia; Africa; Australia
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Worldwide |
Discussion | Species ca. 150 (22 in the flora). The greatest species diversity of Cyperus subg. Pycnostachys is found in the lowland forests of Central America, South America, Africa, and Malesia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 23, p. 151. | FNA vol. 23. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycnostachys | Cyperaceae > Cyperus |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | C. autumnalis, C. haspan subsp. juncoides, C. haspan var. americanus, C. juncoides | C. subg. Protocyperus |
Name authority | Linnaeus: Sp. Pl. 1: 45. (1753) | C. B. Clarke: in J. D. Hooker, Fl. Brit. India 6: 597. (1893) |
Web links |