Difference between revisions of "Cyperus retrorsus"
Bot. Gaz. 3: 17. 1878.
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|name=Mariscus cylindricus | |name=Mariscus cylindricus | ||
|authority=Elliott | |authority=Elliott | ||
− | }} {{Treatment/ID/ | + | |publication_title=Sketch Bot. S. Carolina |
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+ | }} {{Treatment/ID/Basionym | ||
|name=Cyperus cylindricus | |name=Cyperus cylindricus | ||
|authority=(Elliott) Britton | |authority=(Elliott) Britton | ||
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
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|genus=Cyperus | |genus=Cyperus | ||
|subgenus=Cyperus subg. Cyperus | |subgenus=Cyperus subg. Cyperus |
Revision as of 20:08, 24 September 2019
Herbs, perennial, cespitose, shortly rhizomatous. Culms trigonous, 20–50(–85) cm × 1–2(–4) mm, glabrous. Leaves 3–6(–10), 10–40(–55) cm × 1.5–4(–5) mm, V- to inversely W-shaped. Inflorescence: spike 1, densely oblong-ovoid often with small basal branches, 8–16 × 4–12(–16) mm; rays 4–8(–11), 0.5–3.5(–8.5) cm; bracts (3–)4–6(–10), ascending at (30–)45°, flat to broadly V-shaped, (4–)14–30(–55) cm × 1–5 mm, scabridulous along margins only; rachilla deciduous, wings persistent, 0.2–0.3 mm wide. Spikelets 40–120, oblong-lanceoloid, subterete, 2.2–4(–4.5) × 0.8–1.6 mm; distal spikelet spreading or ascending; floral scales persistent, 2–5, appressed, brown to stramineous, or fuscous and lustrous, medially greenish and 1(–3)-ribbed, laterally greenish to yellowish white and 3–4-ribbed, oblong to oblong-lanceolate, 1.8–2.5 × 1–1.5 mm, subcoriacous. Flowers: anthers 0.3–0.5 mm; styles 0.5–0.8 mm; stigmas 0.6–0.9 mm. Achenes brown, oblong-ellipsoid, 1.2–1.7 × 0.5–0.6 mm, base cuneate, apex subacute, surfaces papillose.
Phenology: Fruiting summer (Jun–Aug).
Habitat: Open woods and thickets in moist to dry, sandy soils
Elevation: 0–1000 m
Distribution
![V23 323-distribution-map.jpg](/w/images/8/8a/V23_323-distribution-map.jpg)
Ala., Ark., Del., D.C., Fla., Ga., La., Md., Miss., Mo., N.J., N.Y., N.C., Okla., S.C., Tenn., Tex., Va., Mexico (Tamaulipas).
Discussion
Cyperus retrorsus was reported in Indiana (M. L. Horvat 1941); we have been unable to confirm the report.
Selected References
None.