Cyperus refractus

Engelmann ex Boeckeler

Linnaea 36: 369. 1870, based on Cyperus refrofractus Engelmann ex Steudel, Syn. Pl. Glumac. 2: 47. 1855, not (Linnaeus) Torrey 1848.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 182. Mentioned on page 149, 181.
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Herbs, perennial, cespitose, with inconspicuous, short rhizomes scarcely visible between culm bases. Culms basally cormlike, trigonous, 30–100 cm × 2–4 mm, glabrous. Leaves V-shaped to flat, 20–70 cm × 3–8 mm, adaxial surface, margins minutely scabridulous. Inflorescences: spikes loose, broadly ellipsoid to ovoid, 4–7 × 2–6 cm; rays 6–13(–16), 4–25 cm, glabrous; rachis 1.5–3 cm; bracts 3–6, horizontal to ascending at 30°, flat, 5–35 cm × 2.5–6 mm; rachilla persistent, wings 0.4–0.5 mm wide. Spikelets (13–)20–60(–74), linear, ± terete, (11–)13–25(–28) × 1.2–1.5 mm; distal spikelets spreading or ascending; floral scales persistent, (2–)3–6, stramineous, red-purple striate, laterally 3–5-ribbed, ovate-lanceolate, 4.5–5.3 × 1.2–1.5 mm. Flowers: anthers 1–1.5 mm; styles 1.5 mm; stigmas 1.5 mm. Achenes brown to purplish brown, oblong-linear (5–6 times long as wide), 2.6–3 × 0.5–0.6 mm, base cuneate, apex obtuse, surfaces puncticulate.


Phenology: Fruiting summer (Jul–Aug).
Habitat: Sandy riverbanks, gravelly roadsides, pastures, disturbed places
Elevation: 20–300 m

Distribution

V23 310-distribution-map.jpg

Ala., Ark., D.C., Ga., Md., Mo., N.C., Pa., S.C., Tenn., Va., W.Va.

Discussion

Cyperus refractus is often mistaken for C. strigosus, which has shorter anthers (0.4–0.5 mm) and spreading, ± deciduous floral scales.

Selected References

None.

Lower Taxa

None.
... more about "Cyperus refractus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Engelmann ex Boeckeler +
Ala. +, Ark. +, D.C. +, Ga. +, Md. +, Mo. +, N.C. +, Pa. +, S.C. +, Tenn. +, Va. +  and W.Va. +
20–300 m +
Sandy riverbanks, gravelly roadsides, pastures, disturbed places +
Fruiting summer (Jul–Aug). +
Illustrated +  and Endemic +
Undefined subg. Chlorocyperus +, Cyperus subg. Mariscus +  and Undefined subg. Papyrus +
Cyperus refractus +
Cyperus subg. Cyperus +
species +