Cyperus drummondii |
Cyperus spectabilis |
|
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Drummond's sedge |
showy sedge, spectacular flatsedge |
|
Habit | Herbs, perennial, cespitose; rhizomes 0.5–2 cm, often absent. | Herbs, perennial, rhizomatous. |
Culms | trigonous, 35–170 cm × 2–4.7 mm, scabrid on angles. |
trigonous, (12–)30–80(–90) cm × 0.7–1.7 mm, glabrous or nearly so. |
Leaves | 4–12, with readily visible cross ribs especially on abaxial surface, flat to V-shaped, 25–100 cm × 2.4–11 mm. |
flat to V-shaped, 20–45 cm × 2–4 mm, margins and keel minutely scabridulous. |
Inflorescences | heads digitate, globose, 1–1.7 cm diam.; rays 3–5, 1–7 cm; 2d order rays absent; bracts 3–5, horizontal to ascending at 30°, with prominent cross ribs, V-shaped, (4–)11–35(–48) cm × 1–6.7 mm (longest 1/2 as long as culm); 2d order bracts absent. |
spike 1, loosely ovoid to ovoid-ellipsoid, (1.5–)2.5–7 × (1–)1.5–3.5 cm; rays 1–4, 1–15 cm; rachis 1–2 cm; bracts 2–4, oblique or ascending, 1–15(–24) cm × 0.4–3.5 mm, keel, margins scabrid; rachilla ± deciduous, wingless. |
Spikelets | 10–40, oblong to linear-lanceoloid, 5–1.8 × 1.5–2.2 mm; floral scales 18–42, pale grayish green, turning brownish, proximally greenish or brownish, 2-keeled, weakly to distinctly 1-ribbed, proximal 1/2 2-ribbed, ovate, 1.4–1.6 × 0.9–1.4 mm, acute (sometimes mucronulate), apically glabrous, occasionally scabridulous. |
(3–)8–40, linear, compressed-quadrangular, 8–18 × (2.4–)2.8–4 mm; floral scales deciduous, (2–)4–12, laterally light brown to reddish brown, medially green or light brown, laterally 2–3-ribbed, oblong-ovate, 1.6–2.6 × (1.5–)1.6–2.2(–2.4) mm, apex obtuse, sometimes mucronulate, medially glabrous. |
Flowers | stamens 1–2; anthers 0.8–1.2 mm; styles 0.8–1 mm; stigmas 0.6–0.8 mm. |
anthers 0.4–0.6 mm; styles 0.3–0.6 mm; stigmas 0.6–1 mm. |
Achenes | brown, slightly stipitate, oblong-ellipsoid (2.4–3.9 times longer than wide), 1–1.2 × 0.3–0.5 mm, apical beak 0.1–0.5 mm, surfaces glabrous. |
brownish, stipitate, ellipsoid, 1.6–2 × (0.7–)0.9–1 mm, stipe whitish, 0.1–0.2 mm, apex obtuse, slightly apiculate, surfaces papillose. |
Cyperus drummondii |
Cyperus spectabilis |
|
Phenology | Fruiting late spring–summer. | Fruiting summer. |
Habitat | Wet, relatively undisturbed habitats, especially flatwoods, ponds, seepage slopes, coastal prairies | Arroyos, riverbanks, clearings in montane forests |
Elevation | 0–200 m (0–700 ft) | 100–1300 m (300–4300 ft) |
Distribution |
AL; FL; GA; LA; MS; SC; TX; Central America; South America; West Indies |
AZ; TX; Mexico |
Discussion | Cyperus drummondii has been treated as a synonym (G. C. Tucker 1994), or a variety (G. Kükenthal 1935–1936), or a subspecies of C. virens (M. F. Denton 1978b). Recent quantitative and field studies (J. R. Carter et al. 1999) provided compelling evidence that specific status is appropriate. Compared to Cyperus virens, C. drummondii is a taller species of less disturbed habitats and has narrower spikelets, ovate scales, and fewer inflorescence bracts. Cyperus virens and C. drummondii are readily distinguished from other Cyperus species in the United States by their sharply angled, scabrid culms and conspicuously septate leaf blades. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23. | FNA vol. 23, p. 178. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycnostachys | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. robustus, C. virens subsp. drummondii, C. virens var. drummondii, C. virens var. robustus | C. buckleyi, C. parryi, C. scaberrimus, C. spectabilis var. filiformis, C. spectabilis var. parryi, C. spectabilis var. scaberrimus |
Name authority | Torrey & Hooker: Ann. Lyceum Nat. Hist. New York 3: 437, errata. (1836) | Sprengel: Novi Provent., 15. (1818) |
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