View source for Cyperus polystachyos

{{Treatment/ID
|accepted_name=Cyperus polystachyos
|accepted_authority=Rottbøll
|publications={{Treatment/Publication
|title=Descr. Pl. Rar.,
|place=21. 1772
|year=1772
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Cyperus brizaeus
|authority=J. Presl & C. Presl
}} {{Treatment/ID/Synonym
|name=Cyperus polystachyos var. leptostachyus
|authority=Boeckeler
}} {{Treatment/ID/Synonym
|name=Pycreus polystachyos
|authority=unknown
}}
|hierarchy=Cyperaceae;Cyperus;Cyperus subg. Pycreus;Cyperus polystachyos
|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. Pycreus]]</div><div class="higher-taxon"><small>species</small>[[Cyperus polystachyos]]</div></div>
|volume=Volume 23
|mention_page=page 142, 159, 184
|treatment_page=page 160
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial (annual?), cespitose. <b>Culms</b> trigonous or ± terete, (3–)20–45(–70) cm × (0.8–) 1.2–2 mm, glabrous. <b>Leaves</b> (2–) 6–10(–16), flat to V-shaped, (2–) 10–30(–60) cm × 1–4 mm. <b>Inflorescences</b>: spike 1, loosely ovoid to densely turbinate, 12–40 × 10–25 mm; rachis 3–10 mm; rays 1–8(–12), 0.5–3(–6) cm; 2d order rays absent; if rays absent, inflorescence single dense cluster of spikelets, 12–40 mm diam.; bracts (3–)4–6(–7), horizontal to ascending at 45°, flanged V-shaped, (2–)5–15(–23) cm × 1–4 mm. <b>Spikelets</b> (5–)15–30(–40), spreading to appressed-ascending, linear-lanceoloid to linear, compressed, 8–18(–40) × (1–)1.3–1.6(–2) mm; floral scales (8–)12–25(–66), laterally stramineous to light brown, medially green, laterally ribless, medially 3–5-ribbed, oblong, (1.5–)1.8–2.4 × (1–)1.2–1.4 mm, apex acute to ± acute, mucronate. <b>Flowers</b>: stamens 2; anthers (0.4–)0.5–0.8 mm, connective not prolonged; styles 0.6–1(–1.4) mm; stigmas (1–)1.4–2 mm. <b>Achenes</b> light to dark brown, oblong, (0.8–)0.9–1.1(–1.2) × 0.4–0.5(–0.6) mm, base cuneate to ± stipelike, apex truncate, apiculate, surfaces punctate to minutely punctate with raised cells.</span><!--

-->{{Treatment/Body
|phenology=Fruiting summer–early fall.
|habitat=Shores, ditches, swales between dunes
|elevation=0–200 m
|distribution=Ala.;Del.;D.C.;Fla.;Ga.;Ky.;La.;Maine;Md.;Mass.;Miss.;N.J.;N.Y.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;W.Va.;Mexico;Central America;South America;Asia;Africa.
|discussion=<p><i>Cyperus polystachyos</i> is polymorphic. Adequate understanding of the infraspecific variations of <i>C. polystachyos</i> requires a worldwide examination, which is beyond the scope of this study. The segregates, <i>C. fugax</i> and <i>C. filicinus</i>, are recognized here; they have been usually accepted by recent workers (e.g., M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991).</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Cyperus polystachyos
|author=
|authority=Rottbøll
|rank=species
|parent rank=subgenus
|synonyms=Cyperus brizaeus;Cyperus polystachyos var. leptostachyus;Pycreus polystachyos
|basionyms=
|family=Cyperaceae
|phenology=Fruiting summer–early fall.
|habitat=Shores, ditches, swales between dunes
|elevation=0–200 m
|distribution=Ala.;Del.;D.C.;Fla.;Ga.;Ky.;La.;Maine;Md.;Mass.;Miss.;N.J.;N.Y.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;W.Va.;Mexico;Central America;South America;Asia;Africa.
|reference=None
|publication title=Descr. Pl. Rar.,
|publication year=1772
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V23/V23_252.xml
|genus=Cyperus
|subgenus=Cyperus subg. Pycreus
|species=Cyperus polystachyos
}}<!--

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