View source for Cyperus retrofractus

{{Treatment/ID
|accepted_name=Cyperus retrofractus
|accepted_authority=(Linnaeus) Torrey in J. Carey
|publications={{Treatment/Publication
|title=in J. Carey, Carices North. U.S.,
|place=519. 1847
|year=1847
}}
|common_names=Rough flatsedge
|basionyms={{Treatment/ID/Synonym
|name=Scirpus retrofractus
|authority=Linnaeus
}}
|synonyms={{Treatment/ID/Synonym
|name=Cyperus dipsaciformis
|authority=Fernald
}} {{Treatment/ID/Synonym
|name=Cyperus retrofractus var. dipsaciformis
|authority=(Fernald) Kükenthal
}} {{Treatment/ID/Synonym
|name=Mariscus retrofractus
|authority=unknown
}}
|hierarchy=Cyperaceae;Cyperus;Cyperus subg. Cyperus;Cyperus retrofractus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cyperaceae]]</div><div class="higher-taxon"><small>genus</small>[[Cyperus]]</div><div class="higher-taxon"><small>subgenus</small>[[Cyperus subg. Cyperus]]</div><div class="higher-taxon"><small>species</small>[[Cyperus retrofractus]]</div></div>
|volume=Volume 23
|mention_page=page 148, 181
|treatment_page=page 180
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, cespitose. <b>Culms</b> with cormlike bases, sharply trigonous, 25–90 cm, glabrous proximally, minutely scabridulous distally. <b>Leaves</b> V-shaped, 14–40 cm × 3.5–8 mm, (pubescent on adaxial side of midrib). <b>Inflorescences</b>: spikes loose, obtrulloid to obdeltoid (broadest near apex, nearly as long as wide), 20–28(–34) × (12–)15–30 mm; rays 4–13, (1–)4–24 cm (longest ray shorter than bracts), glabrous; bracts 3–12, ascending at 30–45°, flat, 3–25 cm × 3–7 mm; rachilla persistent, wings 0.4–0.6 mm wide, covering 3/4 of mature achene. <b>Spikelets</b> 30–50, proximal one reflexed, distal ones divaricate, linear-lanceoloid, ± terete, (6.5–) 8–10(–17) × 0.5–0.7 mm; floral scales persistent, 3–6(–8), appressed, stramineous (suffused with reddish purple), 4–5-ribbed laterally, ovate-lanceolate, (4–)4.4–4.9(–5.4) × 1.3–1.5 mm; terminal scale not spinose, apex straight, excurved mucronate, or cuspidate. <b>Flowers</b>: anthers 0.7–1.2 mm; styles 1.5–2 mm; stigmas 2–2.5 mm. <b>Achenes</b> brown to brownish black, narrowly oblong, (2.2–)2.5–3 × 0.6–0.7 mm, base cuneate, apex obtuse, apiculate, surfaces puncticulate.</span><!--

-->{{Treatment/Body
|phenology=Fruiting summer.
|habitat=Roadsides, pastures, disturbed sites in sandy or clayey soils
|elevation=0–300 m
|distribution=Ala.;Ark.;Del.;D.C.;Ga.;Ky.;Mo.;N.J.;N.C.;Ohio;Pa.;S.C.;Tenn.;Va.
|discussion=<p>For information concerning nomenclature of <i>Cyperus retrofractus</i>, see J. R. Carter and C. E. Jarvis (1986).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cyperus retrofractus
|author=
|authority=(Linnaeus) Torrey in J. Carey
|rank=species
|parent rank=subgenus
|synonyms=Cyperus dipsaciformis;Cyperus retrofractus var. dipsaciformis;Mariscus retrofractus
|basionyms=Scirpus retrofractus
|family=Cyperaceae
|phenology=Fruiting summer.
|habitat=Roadsides, pastures, disturbed sites in sandy or clayey soils
|elevation=0–300 m
|distribution=Ala.;Ark.;Del.;D.C.;Ga.;Ky.;Mo.;N.J.;N.C.;Ohio;Pa.;S.C.;Tenn.;Va.
|reference=None
|publication title=in J. Carey, Carices North. U.S.,
|publication year=1847
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V23/V23_307.xml
|genus=Cyperus
|subgenus=Cyperus subg. Cyperus
|species=Cyperus retrofractus
}}<!--

-->[[Category:Treatment]][[Category:Cyperus subg. Cyperus]]