View source for Eleocharis obtusetrigona

{{Treatment/ID
|accepted_name=Eleocharis obtusetrigona
|accepted_authority=(Lindley & Nees) Steudel
|publications={{Treatment/Publication
|title=Syn. Pl. Glumac.
|place=2: 80. 1855
|year=1855
}}
|basionyms={{Treatment/ID/Basionym
|name=Limnochloa obtusetrigona
|authority=Lindley & Nees
|publication_title=in C. F. P. von Martius et al., Fl. Bras.
|publication_place=2(1): 100. 1842
}}
|synonyms={{Treatment/ID/Synonym
|name=E. fistulosa var. obtusetrigona
|authority=(Lindley & Nees) Barros
}} {{Treatment/ID/Synonym
|name=E. mutata var. obtusetrigona
|authority=(Lindley & Nees) C. B. Clarke
}}
|hierarchy=Cyperaceae;Eleocharis;Eleocharis subg. Limnochloa;Eleocharis obtusetrigona
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cyperaceae]]</div><div class="higher-taxon"><small>genus</small>[[Eleocharis]]</div><div class="higher-taxon"><small>subgenus</small>[[Eleocharis subg. Limnochloa]]</div><div class="higher-taxon"><small>species</small>[[Eleocharis obtusetrigona]]</div></div>
|volume=Volume 23
|mention_page=page 116, 117, 119, 120
|treatment_page=page 118
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; rhizomes 3–4 mm thick, soft to hard, longer internodes 3–8 cm, scales more than 1 cm, tubers absent. <b>Culms</b> obscurely 3–5-angled to terete, 40–110 cm × (2–)3.6–7.5 mm, soft, not septate-nodulose, internally spongy, transverse septa incomplete; plants never forming filiform, flaccid culms. <b>Leaves</b>: distal leaf sheaths persistent, membranous, apex acute to long-acuminate, sometimes prolonged into a slender bladelike portion to 6 cm. <b>Spikelets</b> not proliferous, 12–43 × 3.5–6 mm; rachilla joints bearing obscure winglike remnants of floral scales; proximal scale without a flower, amplexicaulous, 3.6–7.5 mm; floral scales 30–125, 1–3 per mm of rachilla, greenish to pale brown, often with pale to dark brown submarginal band or a subapical darker spot, ovate to oblong, 4.3–5.8 × 2.5–3.3 mm, cartilaginous, often membranous toward margins, margins broadly translucent, membranous, apex rounded to acute. <b>Flowers</b>: perianth bristles 6–7, stramineous, margins and spinules reddish to pale brown, stout, flattened, subequal, exceeding achene, 2.5–3.2 mm, coarsely retrorsely spinulose; anthers reddish brown, 1.5–1.9 mm; styles 3-fid or sometimes 2-fid. <b>Achenes</b> pale brown, biconvex, obpyriform, 1.7–2.3 × 1.2–1.5 mm, clearly sculptured at 10–15X, each face with 10–15 rows of transversely elongated cells, often isodiametric at achene base, apex usually constricted to neck 0.5–0.6 mm wide. <b>Tubercles</b> stramineous, lamelliform to high-pyramidal, 0.8–1.1 × 0.7–0.9 mm.</span><!--

-->{{Treatment/Body
|phenology=Fruiting spring–fall.
|habitat=Fresh, permanent water in ditches
|elevation=0–20 m
|distribution=Tex.;e Mexico;Central America (Nicaragua);South America.
|discussion=<p>In North America <i>Eleocharis obtusetrigona</i> is known from only five collections, two of them originally identified as E. fistulosa (Poiret) Link [= E. acutangula (Roxburgh) Schultes], which is common in Mexico and South America. The original description of <i>E. obtusetrigona</i> is poor and does not clearly distinguish E. obtusangula from E. acutangula. H. K. Svenson (1939) included <i>E. obtusetrigona</i> in E. acutangula, which can be distinguished by its acutely trigonous culms as well as its smaller floral scales and achenes. The tubercles are often spongy as in <i>E. quadrangulata</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eleocharis obtusetrigona
|author=
|authority=(Lindley & Nees) Steudel
|rank=species
|parent rank=subgenus
|synonyms=E. fistulosa var. obtusetrigona;E. mutata var. obtusetrigona
|basionyms=Limnochloa obtusetrigona
|family=Cyperaceae
|phenology=Fruiting spring–fall.
|habitat=Fresh, permanent water in ditches
|elevation=0–20 m
|distribution=Tex.;e Mexico;Central America (Nicaragua);South America.
|reference=None
|publication title=Syn. Pl. Glumac.
|publication year=1855
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V23/V23_180.xml
|genus=Eleocharis
|subgenus=Eleocharis subg. Limnochloa
|species=Eleocharis obtusetrigona
}}<!--

-->[[Category:Treatment]][[Category:Eleocharis subg. Limnochloa]]