Cyperus cuspidatus |
Cyperus ovatus |
|
---|---|---|
coastal plain flatsedge |
ovateleaf flatsedge |
|
Habit | Herbs, annual, cespitose. | Herbs, perennial, cespitose, (15–)30–100 cm. |
Culms | 1–6(–25), trigonous to roundly trigonous, (0.5–)2–5(–9) cm × 0.2–0.4–(0.6) mm, glabrous. |
not basally cormlike, trigonous, (15–)30–100 cm × 1–3 mm, glabrous. |
Leaves | 1–6, V-shaped, 1–6 cm × 0.3–1 mm. |
V-shaped, 10–65 cm × 2–4 mm. |
Inflorescences | heads digitate, loosely ovoid, 3–18 × 3–26 mm; rays (0–)1–6(–8), 2.5–20(–30) mm; bracts 2–3(–5), horizontal to ascending at 45(–60)°, V-shaped, 2–60 × 0.3–1.2 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 | (3–)10–20(–30), greenish to reddish brown, narrowly ellipsoid to oblong, 3–11 × (0.8–)1.2–1.5 mm; floral scales (3–)6–20(–28), laterally greenish to reddish brown, glossy, medially greenish to light reddish brown, strongly recurved, laterally ribless, medially strongly 3-ribbed, oblong-ovate, (0.8–)1–1.3 × 0.8–1(–1.2) mm, apex emarginate, cusp 0.6–1.2 mm. |
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 2 or 3; anthers oblong-ovoid, 0.1(–0.2) mm; styles (0.2–)0.4–0.6 mm; stigmas 0.3–0.5 mm. |
anthers 0.3–0.5 mm; styles 0.5 mm; stigmas 1–2 mm. |
Achenes | brown, oblong-obovoid, (0.5–)0.6 × (0.3–)0.4 mm, base cuneate, apex blunt, surfaces coarsely papillose. |
brown, ± stipitate, oblong-fusiform, 1.2–1.5 × 0.4–0.6 mm, apex ± acute, surfaces puncticulate. |
Cyperus cuspidatus |
Cyperus ovatus |
|
Phenology | Fruiting summer. | Fruiting spring–summer. |
Habitat | Damp, disturbed soils | Sandy soils of beaches, coastal woods |
Elevation | 0–300 m (0–1000 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; FL; GA; SC; Mexico; Central America; South America
|
AL; FL; GA; MS; NC; SC
|
Source | FNA vol. 23, p. 158. | FNA vol. 23, p. 183. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycnostachys | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. cylindricus, C. deeringianus, C. litoreus, C. pollardii, C. retrorsus var. curtisii, C. retrorsus var. deeringianus, C. winkleri, Mariscus curtisii, Mariscus litoreus | |
Name authority | Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 1: 204. (1816) | Baldwin: Trans. Amer. Philos. Soc., n. s. 2: 168. (1825) |
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