View source for Eleocharis nigrescens

{{Treatment/ID
|accepted_name=Eleocharis nigrescens
|accepted_authority=(Nees) Steudel
|publications={{Treatment/Publication
|title=Syn. Pl. Glumac.
|place=2: 77. 1854
|year=1854
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms={{Treatment/ID/Basionym
|name=Scirpidium nigrescens
|authority=Nees
|rank=species
|publication_title=in C. F. P. von Martius et al., Fl. Bras.
|publication_place=2(1): 97. 1842
}}
|synonyms=
|hierarchy=Cyperaceae;Eleocharis;Eleocharis subg. Eleocharis;Eleocharis sect. Eleocharis;Eleocharis (sect. Eleocharis) ser. Tenuissimae;Eleocharis nigrescens
|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. Eleocharis]]</div><div class="higher-taxon"><small>section</small>[[Eleocharis sect. Eleocharis]]</div><div class="higher-taxon"><small>series</small>[[Eleocharis (sect. Eleocharis) ser. Tenuissimae]]</div><div class="higher-taxon"><small>species</small>[[Eleocharis nigrescens]]</div></div>
|volume=Volume 23
|mention_page=page 70, 91
|treatment_page=page 93
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>usually annual, tufted, not stoloniferous; rhizomes absent. <b>Culms</b> sometimes ascending, subterete, elliptic, or polygonal, (1–)3–7.5(–9) cm × 0.2–0.5 mm, very soft. <b>Leaves</b>: distal leaf sheaths persistent or disintegrating, colorless, stramineous or green, spotted red-brown to purple, membranous, apex narrowly acute. <b>Spikelets</b>: basal spikelets absent; never proliferous, ovoid or ellipsoid, terete, 2–4.7(–8.5) × 1–2 mm, apex acute to blunt; proximal scale empty or with flower, persistent, clasping 1/2 of culm, similar to floral scales (but 1.1–1.7 mm, midrib region broadly green); subproximal scale with a flower; floral scales spiraled, 10–30(–100), 10–16 per mm of rachilla, colorless, whitish, or pale brown, mottled red-brown to purple, midribs pale brown or green, ovate or elliptic, 1–1.2 × 0.45–0.6 mm, membranous, midrib prominent, apex rounded. <b>Flowers</b>: perianth absent; stamens 1; anthers 0.2–0.3 mm; styles 3-fid. <b>Achenes</b> colorless (appearing green-brown from enclosed seed) or whitish, sometimes spotted red-brown, obovoid, trigonous, angles prominent, 0.5–0.6 × 0.33–0.4 mm, apex constricted proximal to tubercle, smooth. <b>Tubercles</b> white, gray or pale brown, pyramidal or umbonate, trigonous, 0.1–0.15 × 0.15–0.2 mm.</span><!--

-->{{Treatment/Body
|phenology=Fruiting summer–winter.
|habitat=Moist terrestrial sites such as sandy and peaty soils on pond margins, ditches, pine flatwoods
|elevation=0–30 m
|distribution=Fla.;S.C.;Mexico;West Indies;Bermuda;South America;Africa.
|discussion=<p>Usually all the floral scales fall from the rachilla at maturity. The achene epidermis is usually translucent, revealing the brown color of the enclosed seed.</p><!--
--><p>Clarification of delimitation of <i>Eleocharis</i> microlepis (Grisebach) D. A. Simpson, <i>E. setifolia</i>, (A. Richard) A. Raynal, and <i>E. nigrescens</i> in the Americas requires further investigation (D. A. Simpson 1988). Specimens from North America treated herein as <i>E. nigrescens</i> seem to agree well with Simpson’s illustration of <i>E. nigrescens</i>; the anther length of 0.2–0.3 mm recorded here is closer to that of E. microlepis. Simpson (pers. comm.) has not examined specimens of either <i>E. nigrescens</i> or E. microlepis from North America, and lists both E. microlepis and <i>E. setifolia</i> from the West Indies and only <i>E. setifolia</i> from South America.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eleocharis nigrescens
|authority=(Nees) Steudel
|rank=species
|parent rank=series
|synonyms=
|basionyms=Scirpidium nigrescens
|family=Cyperaceae
|phenology=Fruiting summer–winter.
|habitat=Moist terrestrial sites such as sandy and peaty soils on pond margins, ditches, pine flatwoods
|elevation=0–30 m
|distribution=Fla.;S.C.;Mexico;West Indies;Bermuda;South America;Africa.
|reference=None
|publication title=Syn. Pl. Glumac.
|publication year=1854
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V23/V23_132.xml
|genus=Eleocharis
|subgenus=Eleocharis subg. Eleocharis
|section=Eleocharis sect. Eleocharis
|series=Eleocharis (sect. Eleocharis) ser. Tenuissimae
|species=Eleocharis nigrescens
}}<!--

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