Difference between revisions of "Cyperus schweinitzii"
Ann. Lyceum Nat. Hist. New York 3: 276. 1836.
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Latest revision as of 01:36, 30 July 2020
Herbs, perennial, rhizomatous. Culms trigonous, (10–) 20–50 cm × (0.6–) 1–2 mm, glabrous or more often scabridulous, either in distal 1/2 or over entire length; basal sheaths, 1–3, light-brown, 1–4 cm, papery. Leaves flat to V-shaped, (2–) 20–35 cm × 2–6 mm, margins and keel minutely scabridulous; proximal leaves bladeless. Inflorescences: spikes ± umbellate to slenderly (infrequently broadly) ovoid, 10–25 × 7–16 mm; rays 3–5, 1.5–8 (–15) cm; bracts 3–7, erect (or declined at most 25–30° from vertical), (2.5–) 8–20 (–25) cm × (0.5–) 1.5–6 mm; rachilla ± deciduous, wingless. Spikelets (1–) 5–10 (–20), oblong to linearoblong, quadrangular, 7–10 (–18) × (2.8–) 3.2–4 (–4.5) mm; floral scales deciduous, (1–) 5–10 (–14), spreading, laterally stramineous or dull whitish, sometimes also red-spotted, medially green, laterally 2–3-ribbed, medially 3-ribbed, broadly ovate to oblongovate, (2.3–) 2.8–3.2 × (2–) 2.4–3.2 mm, apex broadly rounded, often clear-erose, cusp 0.1–0.4 mm in proximal scales, 0.3–1 mm in distal scales. Flowers: anthers 0.8–1.4 mm; styles 0.1–0.3 mm; stigmas 1.5–3 mm. Achenes light to dark-brown or nearly black, broadly ellipsoid, infrequently obovoid, 2–2.4 × 0.9–1.4 mm, base cuneate to ± stipelike, apex obtuse to broadly rounded, surfaces papillose. 2n = 166.
Phenology: Fruiting late spring–early summer.
Habitat: Riverbanks, sand bars, lakeshores, sand dunes, sandy openings in woods
Elevation: 0–1000 m
Distribution
![V23 291-distribution-map.jpg](/w/images/9/99/V23_291-distribution-map.jpg)
Alta., Man., Ont., Que., Sask., Colo., Ill., Iowa, Ky., Mass., Mich., Minn., Mo., Mont., N.J., N.Mex., N.Y., Ohio, Okla., Pa., S.Dak., Tex., Utah, Wash., Wis., Wyo., Mexico (Coahuila)
Discussion
Cyperus schweinitzii is introduced, but not naturalized, in Massachusetts and Washington.
Selected References
None.
Lower Taxa
"shortened" is not a number.