Cyperus virens |
Cyperus ovatus |
|
---|---|---|
green flatsedge |
ovateleaf flatsedge |
|
Habit | Herbs, perennial, cespitose; rhizomes 0.5–2 cm, often absent. | Herbs, perennial, cespitose, (15–)30–100 cm. |
Culms | trigonous, (20–)60–70(–100) cm × 2.4–6.9 mm, scabrid on angles. |
not basally cormlike, trigonous, (15–)30–100 cm × 1–3 mm, glabrous. |
Leaves | 4–12, flat to V-shaped, with readily visible cross ribs especially on abaxial surface, 20–50 cm × 3–14 mm. |
V-shaped, 10–65 cm × 2–4 mm. |
Inflorescences | heads digitate to hemispheric, 1–3.5 cm diam.; rays 6–12, 1–9(–14) cm; 2d order rays often present, (0.5–)1–3 cm; 3d order rays occasionally present, 5–12 mm; bracts 4–8, horizontal to ascending at 30°, with prominent cross ribs,V-shaped, (1.5–)3–50(–75) cm × 0.5–13 mm; 2d order bracts 3–10 × 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 | 10–40(–50), oblong to linear-lanceoloid, 5–18 × 2–3.2 mm; floral scales 10–40, pale grayish brown, or greenish, proximally greenish or brownish, oblanceolate, 2-keeled, weakly to distinctly 1-ribbed, proximal half 2-ribbed, (1.3–)1.5–2(–2.4) × 0.9–1.4 mm, apex acute (sometimes mucronulate), apically glabrous, occasionally scabridulous. |
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 1–2; anthers 0.8–1.4 mm; styles 0.8–1 mm; stigmas 0.6–0.8 mm. |
anthers 0.3–0.5 mm; styles 0.5 mm; stigmas 1–2 mm. |
Achenes | brown, slightly to distinctly stipitate, ellipsoid (2.7–4.1 times as long as wide), (0.9–)1.2–1.5 × 0.3–0.4 mm, apical beak 0.1–0.5 mm, surfaces glabrous. |
brown, ± stipitate, oblong-fusiform, 1.2–1.5 × 0.4–0.6 mm, apex ± acute, surfaces puncticulate. |
Cyperus virens |
Cyperus ovatus |
|
Phenology | Fruiting spring–fall. | Fruiting spring–summer. |
Habitat | Wet pastures, marshes, roadside ditches | Sandy soils of beaches, coastal woods |
Elevation | 0–100 m (0–300 ft) | |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; Mexico; Central America; South America
|
AL; FL; GA; MS; NC; SC
|
Discussion | Cyperus virens was found as waif in California in the 1800s (M. F. Denton 1978b; G. C. Tucker 1993b). Cyperus virens is readily distinguished from other species of subg. Pycnostachys by its trigonous culms, scabrid angles, and leaves and inflorescence bracts conspicuously septate by numerous cross ribs between the main ribs. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 153. | 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 | Michaux: Fl. Bor.-Amer. 1: 28. (1803) | Baldwin: Trans. Amer. Philos. Soc., n. s. 2: 168. (1825) |
Web links |