View source for Eleocharis ambigens

{{Treatment/ID
|accepted_name=Eleocharis ambigens
|accepted_authority=Fernald
|publications={{Treatment/Publication
|title=Rhodora
|place=37: 394. 1935
|year=1935
}}
|common_names=Éléocharide ambiquë
|basionyms=
|synonyms=
|hierarchy=Cyperaceae;Eleocharis;Eleocharis subg. Eleocharis;Eleocharis sect. Eleocharis;Eleocharis (sect. Eleocharis) ser. Eleocharis;Eleocharis ambigens
|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. Eleocharis]]</div><div class="higher-taxon"><small>species</small>[[Eleocharis ambigens]]</div></div>
|volume=Volume 23
|mention_page=page 64, 65, 72, 77, 79
|treatment_page=page 78
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial, mat-forming; rhizomes evident, long, 1–2 mm thick, firm, cortex persistent, longer internodes 1–3 cm, scales persistent, 5–10 mm, membranous, not fibrous. <b>Culms</b> terete, often with to 16 blunt ridges when dry, 25–80 cm × 0.5–1.5 mm, firm, internally spongy. <b>Leaves</b>: distal leaf sheaths persistent, not splitting, proximally dark red, distally red to stramineous or green, often callose, thinly papery (to membranous), apex dark red-brown, obtuse to subtruncate, tooth sometimes present on some culms, to 0.3 mm. <b>Spikelets</b> ovoid to lanceoloid, 5–23 × 2–3(–4) mm, apex acute (to obtuse); proximal scale amplexicaulous, entire; subproximal scale with flower; floral scales often spreading in fruit, 10–60, 3–4 per mm of rachilla, medium brown, rarely red-brown, midrib regions mostly stramineous to green, in proximal part of spikelet ovate, in distal part lanceolate, 2.5–3.5 × 1.7 mm, entire, apex acute to rarely obtuse, often carinate in distal part of spikelet. <b>Flowers</b>: perianth bristles 2–4(–5), brown, slender to stout, usually very unequal, rudimentary to equaling achene; stamens 3; anthers brown, 1.5–2 mm; styles 2-fid, sometimes some 3-fid. <b>Achenes</b> not persistent, dark yellow or stramineous, obovoid to obpyriform, all biconvex or some (very rarely all) compressedtrigonous, angles obscure, 1–1.5 × 0.9–1.25 mm, apex rounded, neck absent (to very short), finely rugulose at 10–20X, with 20 or more horizontal ridges in vertical series and/or finely cancellate at 10–30X. <b>Tubercles</b> brown or proximally whitish, pyramidal, depressed, rarely some as high as wide, 0.15–0.3(–0.5) × (0.3–)0.4–0.6 mm. <b>2n</b> = 44, 45, 46.</span><!--

-->{{Treatment/Body
|phenology=Fruiting spring–summer.
|habitat=Coastal (rarely inland) fresh to brackish pond shores, marshes, disturbed places
|elevation=0–10 m
|distribution=Que.;Conn.;Fla.;Ga.;La.;Mass.;Miss.;N.J.;N.C.;R.I.;S.C.;Tex.;Va.
|discussion=<p><i>Eleocharis ambigens</i> is usually treated as a synonym of <i>E. fallax</i> because some specimens from Massachusetts to Georgia have some 3-fid styles and some obscurely trigonous achenes. A specimen of <i>E. ambigens</i> from Louisiana has trigonous achenes. <i>Eleocharis ambigens</i> is very similar to and perhaps better included in <i>E. uniglumis</i> (S.-O. Strandhede 1967). Intermediates with <i>E. macrostachya</i> occur in Louisiana and Texas. The depressed tubercles are diagnostic of <i>E. ambigens</i>. <i>Eleocharis ambigens</i> is sometimes confused with <i>E. montevidensis</i>, which is readily distinguished by its floral scales with broadly rounded apices.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eleocharis ambigens
|authority=Fernald
|rank=species
|parent rank=series
|synonyms=
|basionyms=
|family=Cyperaceae
|phenology=Fruiting spring–summer.
|habitat=Coastal (rarely inland) fresh to brackish pond shores, marshes, disturbed places
|elevation=0–10 m
|distribution=Que.;Conn.;Fla.;Ga.;La.;Mass.;Miss.;N.J.;N.C.;R.I.;S.C.;Tex.;Va.
|reference=None
|publication title=Rhodora
|publication year=1935
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V23/V23_103.xml
|genus=Eleocharis
|subgenus=Eleocharis subg. Eleocharis
|section=Eleocharis sect. Eleocharis
|series=Eleocharis (sect. Eleocharis) ser. Eleocharis
|species=Eleocharis ambigens
}}<!--

-->[[Category:Treatment]][[Category:Eleocharis (sect. Eleocharis) ser. Eleocharis]]