Difference between revisions of "Cyperus schweinitzii"
Ann. Lyceum Nat. Hist. New York 3: 276. 1836.
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|common_names=Schweinitz’s flatsedge | |common_names=Schweinitz’s flatsedge | ||
− | |basionyms={{Treatment/ID/ | + | |special_status={{Treatment/ID/Special_status |
+ | |code=F | ||
+ | |label=Illustrated | ||
+ | }} | ||
+ | |basionyms={{Treatment/ID/Basionym | ||
|name=Cyperus alterniflorus | |name=Cyperus alterniflorus | ||
|authority=Schweinitz | |authority=Schweinitz | ||
+ | |rank=species | ||
+ | |publication_title= | ||
+ | |publication_place=1824 | ||
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|synonyms= | |synonyms= | ||
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name=Cyperus schweinitzii | name=Cyperus schweinitzii | ||
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|authority=Torrey | |authority=Torrey | ||
|rank=species | |rank=species | ||
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|publication title=Ann. Lyceum Nat. Hist. New York | |publication title=Ann. Lyceum Nat. Hist. New York | ||
|publication year=1836 | |publication year=1836 | ||
− | |special status= | + | |special status=Illustrated |
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V23/V23_291.xml |
|genus=Cyperus | |genus=Cyperus | ||
|subgenus=Cyperus subg. Cyperus | |subgenus=Cyperus subg. Cyperus |
Latest revision as of 21:39, 5 November 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 linear-oblong, 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 oblong-ovate, (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.