Cyperus croceus |
Cyperus prolifer |
|
---|---|---|
Baldwin's flatsedge |
miniature flatsedge |
|
Habit | Herbs perennial, cespitose. | Herbs, perennial, cespitose, rhizomatous. |
Culms | trigonous, (4–)14–45 cm × 1–2 mm, glabrous. |
trigonous to terete, 20–100 cm × 2–6 mm, soft (flattened in drying), glabrous, often flopping over and rooting at base of rays. |
Leaves | yellow-green, flat, 18–44 cm × 3–4.5 mm. |
blades reduced to sheath. |
Inflorescences | spikes densely to loosely globose to ovoid, 10–20 mm wide; rays (3–)5–9(–14), 1–15(–26) cm; rachis 3–6(–9) mm; bracts (4–)6–9(–11), horizontal to ascending at 45°, flat, 1–30 cm × 0.5–4 mm; rachilla deciduous, wings persistent, 0.3–0.5(–0.8) mm wide. |
rays 100–250, 5–16 cm; 2d order rays 0.5–5 cm; bracts 2–3, horizontal or reflexed, 4–12 cm × 1.5–4 mm. |
Spikelets | (10–)30–50, oblong to lanceoloid, quadrangular to subterete, compressed, 4–8 × 1–1.3 mm; distal spikelet spreading or ascending; floral scales persistent, (1–)2–4(–6), appressed, whitish with red speckles, laterally 2–4-ribbed, ovate, 2.3–3.6 × 1.8–2.2 mm. |
1–30, linear-lanceoloid, ellipsoid to narrowly ovoid, compressed-quadrangular, 6–17 × 1–1.5 mm; floral scales 5–12, reddish brown, 1–3-ribbed, 1.2–1.7 × 0.7–0.9 mm, apex mucronulate. |
Flowers | anthers 0.5 mm; styles 0.6–1.3 mm; stigmas 1.2–2.6 mm. |
stamens 3; anthers 1–1.2 mm; styles 0.3 mm; stigmas 1–1.3 mm. |
Achenes | reddish brown to nearly black, sessile, oblong, ellipsoid, 2–2.4 × 0.4–0.5(–0.7) mm, apex ± truncate-emarginate, apiculate, surfaces puncticulate. |
brown, obovoid, 0.4 × 0.2 mm, base stipelike to nearly cuneate, apex obtuse, surfaces finely reticulate. |
Cyperus croceus |
Cyperus prolifer |
|
Phenology | Fruiting summer–early fall. | Fruiting summer. |
Habitat | Disturbed, sunny areas, coastal rocks, moist thickets | Pond shores, marshes |
Elevation | 0–200 m (0–700 ft) | 0–200 m (0–700 ft) |
Distribution |
AL; AR; DE; FL; GA; LA; MD; MO; MS; NC; NJ; OK; PA; SC; TN; TX; VA; WV; Mexico; Central America; West Indies; South America (Venezuela)
|
CA; FL; tropical e Africa [Introduced in North America] |
Discussion | Cyperus globulosus Aublet is a synonym of C. luzulae (Linnaeus) Rottbøll ex Retzius, which is a widespread neotropical species, and it has long been misapplied to Cyperus croceus (G. C. Tucker 1987). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Cyperus prolifer has long been cultivated in fish ponds and water gardens and has been reported under the name C. isocladus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 23, p. 183. | FNA vol. 23, p. 152. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Pycnostachys |
Sibling taxa | ||
Synonyms | C. baldwinii, C. cyclostachyus, C. echinatus var. multiflora, C. globulosus var. pseudofiliculmis, C. globulosus var. robustus, C. plankii, C. retrorsus var. robustus, Mariscus bracheilema, Mariscus brittonii | C. isocladus |
Name authority | Vahl: Enum. Pl. 2: 357. (1805) | Lamarck: in J. Lamarck and J. Poiret, Tabl. Encycl. 1: 147. (1791) |
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