Cyperus lanceolatus |
Cyperus lancastriensis |
|
---|---|---|
epiphytic flatsedge |
manyflower flatsedge, Porter's sedge |
|
Habit | Herbs, perennial, cespitose, rhizomatous. | Herbs, perennial, cespitose, with inconspicuous, short rhizomes scarcely visible between culm bases. |
Culms | trigonous, compressed, 15–75 cm × 0.5–3 mm, glabrous. |
basally cormlike, trigonous, (10–)20–80 cm × 1–3 mm, glabrous. |
Leaves | 1–3, 5–30 cm × 1–2 mm. |
inversely W-shaped, 20–70 cm × 5–11 mm, adaxial surface, margins minutely scabridulous. |
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 ellipsoid to obovoid, 2.5–4.3 × 1.5–3 cm; rays 5–10, 4–20 cm, glabrous; rachis 7–14 mm; bracts 3–8, horizontal to ascending at 45°, flat, 5–35 cm × 2.5–6 mm; rachilla persistent, wings 0.5 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. |
50–90, linear-lanceoloid to linear-subulate, ± terete-quadrangular, (11–)12–13(–15) × 1.1–1.6 mm; distal spikelet spreading or ascending; floral scales persistent, 3–6(–8), appressed, whitish green or often yellow-tinted, sometimes reddish striate, laterally 4-ribbed, ovate-lanceolate, (3.9–)4.2–4.6(–4.8) × 1.6–2 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 0.7–1 mm; styles 1–1.5 mm; stigmas 2–3 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. |
yellowish brown to brown, ± stipitate, conspicuously falcate, 3–4 times long as wide, oblong, 2.2–2.6 × 0.6–0.7 mm, apex obtuse, surfaces puncticulate. |
Cyperus lanceolatus |
Cyperus lancastriensis |
|
Phenology | Fruiting summer. | Fruiting summer (Jul–Aug). |
Habitat | Marshes | Disturbed, sunny or partly shaded places in mesic or dry-mesic soils, often on riverbanks and flood plains |
Elevation | 0–100 m (0–300 ft) | 0–800 m (0–2600 ft) |
Distribution |
AL; FL; GA; LA; TX; Mexico; Central America; South America; Africa
|
AL; AR; DC; DE; FL; GA; KY; MD; MO; NC; NJ; OH; PA; SC; TN; VA; WV
|
Source | FNA vol. 23, p. 162. | FNA vol. 23. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycreus | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. densus, C. humboldtianus, C. lanceolatus var. compositus, Pycreus densus | C. refractus var. lancastriensis, Mariscus lancastriensis |
Name authority | Poiret: in J. Lamarck et al., Encycl. 7: 245. (1806) | Porter: in A. Gray, Manual ed. 5 issue 6, 555. (1867) |
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