Cyperus haspan |
Cyperus ovatus |
|
---|---|---|
haspan flatsedge |
ovateleaf flatsedge |
|
Habit | Herbs, perennial, cespitose, shortly rhizomatous. | Herbs, perennial, cespitose, (15–)30–100 cm. |
Culms | trigonous, (2–)25–60(–100) cm × 1–4 mm, soft (flattened in drying), glabrous. |
not basally cormlike, trigonous, (15–)30–100 cm × 1–3 mm, glabrous. |
Leaves | usually reduced to sheaths, occasionally with blades, flat to V-shaped, (3–)10–30 cm × (1–)2.5–5 mm. |
V-shaped, 10–65 cm × 2–4 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. |
spikes densely ovoid to cylindric, 8–17 mm wide; rays 1–6, 2–10 cm, glabrous; rachis 4–8 mm; bracts 3–9, ± horizontal, flat, 4–20 cm × 2–4 mm; rachilla persistent, wings deciduous, 0.2(–0.3) mm wide. |
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. |
30–80, oblong-lanceoloid, ± terete-quadrangular, 4–7 × 1.5–2 mm; distal spikelet spreading or ascending; floral scales persistent, 4–6, appressed, stramineous, laterally 3-ribbed, oblong-elliptic, 1.9–2.6 × 1.1–1.5 mm. |
Flowers | stamens 3; anthers 0.3–0.5 mm; styles 0.4–0.9 mm; stigmas 0.5–0.8(–1.3) mm. |
anthers 0.3–0.5 mm; styles 0.5 mm; stigmas 1–2 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. |
brown, ± stipitate, oblong-fusiform, 1.2–1.5 × 0.4–0.6 mm, apex ± acute, surfaces puncticulate. |
Cyperus haspan |
Cyperus ovatus |
|
Phenology | Fruiting summer. | Fruiting spring–summer. |
Habitat | Swales between dunes, marshes, pond shores | Sandy soils of beaches, coastal woods |
Elevation | 0–200 m (0–700 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; VA; Mexico; Central America; South America; Asia; Africa; Australia
|
AL; FL; GA; MS; NC; SC
|
Source | FNA vol. 23, p. 151. | FNA vol. 23, p. 183. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | C. autumnalis, C. haspan subsp. juncoides, C. haspan var. americanus, C. juncoides | C. cylindricus, C. deeringianus, C. litoreus, C. pollardii, C. retrorsus var. curtisii, C. retrorsus var. deeringianus, C. winkleri, Mariscus curtisii, Mariscus litoreus |
Name authority | Linnaeus: Sp. Pl. 1: 45. (1753) | Baldwin: Trans. Amer. Philos. Soc., n. s. 2: 168. (1825) |
Web links |