Cyperus lanceolatus |
Cyperus ovatus |
|
---|---|---|
epiphytic flatsedge |
ovateleaf flatsedge |
|
Habit | Herbs, perennial, cespitose, rhizomatous. | Herbs, perennial, cespitose, (15–)30–100 cm. |
Culms | trigonous, compressed, 15–75 cm × 0.5–3 mm, glabrous. |
not basally cormlike, trigonous, (15–)30–100 cm × 1–3 mm, glabrous. |
Leaves | 1–3, 5–30 cm × 1–2 mm. |
V-shaped, 10–65 cm × 2–4 mm. |
Inflorescences | spikes 1(–2), ovoid, 5–23 × 9–21 mm; rays 2–3(–4), 0–15 mm; if rays absent, head single, compact, sessile, (12–)15–20 mm diam.; bracts 2–3, horizontal to vertical, 2–14 cm × 0.5–3.5 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 | 1–6, oblong-lanceoloid, 5–26 × 2–3 mm; floral scales 12–54, closely imbricate, laterally yellowish brown, medially pale brown, occasionally greenish, laterally 1-ribbed, medially 3-ribbed, distinctly 2-keeled basally, ovate, 1.8–2.6 × 1.4–1.7 mm, apex obtuse. |
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; anthers 0.4–0.5 mm, connectives not prolonged; styles 0.3–1 mm; stigmas 0.6–0.8(–1) mm. |
anthers 0.3–0.5 mm; styles 0.5 mm; stigmas 1–2 mm. |
Achenes | brown, network of ridges forming isodiametric or square cells, stipitate, obovoid to ellipsoid, 1.1–1.3 × (0.5–)0.6 mm, apex acute to broadly rounded, surfaces minutely punctate or finely papillose. |
brown, ± stipitate, oblong-fusiform, 1.2–1.5 × 0.4–0.6 mm, apex ± acute, surfaces puncticulate. |
Cyperus lanceolatus |
Cyperus ovatus |
|
Phenology | Fruiting summer. | Fruiting spring–summer. |
Habitat | Marshes | Sandy soils of beaches, coastal woods |
Elevation | 0–100 m (0–300 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; FL; GA; LA; TX; Mexico; Central America; South America; Africa
|
AL; FL; GA; MS; NC; SC
|
Source | FNA vol. 23, p. 162. | FNA vol. 23, p. 183. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycreus | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. densus, C. humboldtianus, C. lanceolatus var. compositus, Pycreus densus | C. cylindricus, C. deeringianus, C. litoreus, C. pollardii, C. retrorsus var. curtisii, C. retrorsus var. deeringianus, C. winkleri, Mariscus curtisii, Mariscus litoreus |
Name authority | Poiret: in J. Lamarck et al., Encycl. 7: 245. (1806) | Baldwin: Trans. Amer. Philos. Soc., n. s. 2: 168. (1825) |
Web links |