Cyperus floribundus |
Cyperus filiformis |
|
---|---|---|
Rio Grande sedge |
wiry flatsedge |
|
Habit | Herbs, perennial, cespitose, rhizomatous. | Herbs, perennial. |
Culms | trigonous, basally tuberous thickened, 15–40 cm × 1–2.5 mm, glabrous. |
trigonous, 20–36 cm × 0.5–1 mm. |
Leaves | flat to V-shaped, 10–30 cm × 1–2 mm. |
flat, 4–22 cm × 1–2 mm. |
Inflorescence(s) | spike 1, densely oblong to ellipsoid, 8–36 × 8–20 mm; rays 4–12, 10–20 cm; bracts 3–6, horizontal to ascending at 30°, V-shaped, 3–15 cm × (3–)4–5.8 mm; rachilla deciduous, wings 0.5–0.7 mm wide. |
a single loose cluster of spikelets; rays 0–(1–2), if present, to 4 cm; bracts 2–3, ascending, 1–8 cm × 0.7–1 mm; rachilla with wings 0.6 mm wide. |
Spikelets | (5–)20–35(–60), linear to oblong, quadrangular; 4–12(–21) × 0.7–1.2 mm, base narrowed to 0.4–1 mm; floral scales persistent, 1–3(–5), appressed, laterally whitish to reddish brown, stramineous with reddish spots, medially green, laterally 3–6-ribbed (midrib distinctly scabrid at 30X), narrowly oblong to ovate, 2.6–4.8 × 1.6–2 mm; apex rounded to ± acute, entire, with mucro 0.3–0.5 mm; sterile terminal scale involute, 0.4–0.6 mm wide, uncinate; distal floral scales with cusp 0.6–1.9. |
2–8, linear, terete, 6–20 × 0.7–1 mm; floral scales 6–10, medially green, laterally brown, medially faintly 3-ribbed, laterally faintly 3–5-ribbed, ovate, 2.5–3 × 2 mm. |
Flowers | anthers 0.5–1.3 mm; styles 0.4–0.5 mm; stigmas 0.5–0.9 mm. |
anthers 1 mm; styles 0.5 mm; stigmas 1 mm. |
Achenes | light brown to reddish brown, sessile to slightly stipitate, narrowly ellipsoid, 1.8–2.4 × 0.6–0.8 mm, apex slightly apiculate, surfaces puncticulate. |
black, sessile, obovoid, 2 × 0.8 mm, apex scarcely apiculate, surfaces puncticulate. |
Cyperus floribundus |
Cyperus filiformis |
|
Phenology | Fruiting mid summer–early fall (Jul–Sep). | Fruiting spring–fall. |
Habitat | Damp, disturbed soils, croplands | Damp, disturbed places |
Elevation | 0–1000 m (0–3300 ft) | 0–20 m (0–100 ft) |
Distribution |
TX; Mexico |
FL; West Indies |
Discussion | Included previously in Cyperus retroflexus (or its synonym C. uniflorus), C. floribundus has a much narrower geographic range (southern Texas and northeastern Mexico) and differs in features of spikelet morphology (J. R. Carter and S. D. Jones 1997). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23. | FNA vol. 23. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Diclidium |
Sibling taxa | ||
Synonyms | C. uniflorus var. floribundus, C. uniflorus | C. floridanus, Mariscus filiforme, Mariscus floridensis, Torulinium filiforme |
Name authority | (Kükenthal) J. Rich. Carter & S. D. Jones: Rhodora 99: 330. (1998) | Swartz: Prodr., 20. (1788) |
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