View source for Cyperus onerosus

{{Treatment/ID
|accepted_name=Cyperus onerosus
|accepted_authority=M. C. Johnston
|publications={{Treatment/Publication
|title=SouthW. Naturalist
|place=9: 308. 1964
|year=1964
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}
|basionyms=
|synonyms=
|hierarchy=Cyperaceae;Cyperus;Cyperus subg. Pycnostachys;Cyperus onerosus
|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. Pycnostachys]]</div><div class="higher-taxon"><small>species</small>[[Cyperus onerosus]]</div></div>
|volume=Volume 23
|mention_page=page 144, 150
|treatment_page=page 151
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, cespitose, rhizomatous; base cormlike; rhizomes scaly, 12 cm × 2 mm. <b>Culms</b> trigonous, 20–55 cm × 1.2–11.8 mm, glabrous. <b>Leaves</b> V-shaped, 12–30 cm × 2–3 mm. <b>Inflorescences</b>: heads digitate, 12–20 mm diam.; rays 7–12, 1–13 cm; 2d order rays 1–3 cm (sometimes absent); bracts 3–5, longest ± erect, V-shaped, 5–12(–18) cm × 2–3 mm. <b>Spikelets</b> (8–)20–30, linear-lanceoloid, compressed, 5–10(–14) × 1.4–1.7 mm; floral scales (8–)16–26, laterally brown to reddish brown, medially green, laterally 1-ribbed, medially 3-ribbed, broadly elliptic, 2–2.5 × 1.2–1.6 mm, apex with slightly excurved cusp 0.2–0.3 mm. <b>Flowers</b>: stamens 3; anthers 1 mm, connective apex reddish, subulate, 0.1 mm; styles 1–1.5 mm; stigmas 1.5 mm. <b>Achenes</b> white to light brown, sessile, ellipsoid, 0.7–0.8 × 0.25–0.35 mm, apex obtuse, apiculate, surfaces puncticulate.</span><!--

-->{{Treatment/Body
|phenology=Fruiting early summer (May–Jun).
|habitat=Permanent pools and wet swales between sand dunes
|elevation=1200 m
|distribution=Tex.
|discussion=<p>Of conservation concern.</p><!--
--><p><i>Cyperus onerosus</i> is apparently restricted to Andrews and Winkler counties in Texas.</p><!--
--><p>This interesting endemic is most similar to <i>Cyperus dentatus</i>; it lacks tubers and apparently is not proliferous.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Cyperus onerosus
|authority=M. C. Johnston
|rank=species
|parent rank=subgenus
|synonyms=
|basionyms=
|family=Cyperaceae
|phenology=Fruiting early summer (May–Jun).
|habitat=Permanent pools and wet swales between sand dunes
|elevation=1200 m
|distribution=Tex.
|reference=None
|publication title=SouthW. Naturalist
|publication year=1964
|special status=Illustrated;Endemic;Conservation concern
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V23/V23_230.xml
|genus=Cyperus
|subgenus=Cyperus subg. Pycnostachys
|species=Cyperus onerosus
}}<!--

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