View source for Eleocharis decumbens

{{Treatment/ID
|accepted_name=Eleocharis decumbens
|accepted_authority=C. B. Clarke
|publications={{Treatment/Publication
|title=Bull. Misc. Inform., addit. ser.
|place=8: 23. 1908
|year=1908
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Eleocharis montevidensis var. decumbens
|authority=(C. B. Clarke) V. E. Grant
|rank=variety
}}
|hierarchy=Cyperaceae;Eleocharis;Eleocharis subg. Eleocharis;Eleocharis sect. Eleocharis;Eleocharis (sect. Eleocharis) ser. Eleocharis;Eleocharis decumbens
|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 decumbens]]</div></div>
|volume=Volume 23
|mention_page=page 82
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial, densely tufted; rhizomes often hidden by culms and roots, fairly long, 3–4 mm thick, hard, cortex persistent, longer internodes from very short to 5 mm, scales usually clearly evident, disintegrating to fibers, 20–25 mm, papery. <b>Culms</b> terete, often with 10–18 blunt ridges when dry, 10–50 cm × 0.3–2 mm, firm to rigid, spongy. <b>Leaves</b>: distal leaf sheaths persistent, not splitting, proximally brown or reddish, distally stramineous, brown, reddish or green, often inflated, papery, apex mostly dark red-brown, subtruncate to obtuse, often callose, tooth absent. <b>Spikelets</b> ovoid, 3–8 × 2–2.5 mm, apex acute; proximal scale amplexicaulous, entire; subproximal scale empty or with flower; floral scales appressed in fruit, 10–20, 3 per mm of rachilla, orange-brown, midrib regions often greenish, ovate, 3–3.5 × 1.5 mm, apex entire, acute, often carinate in distal part of spikelet. <b>Flowers</b>: perianth bristles 6, stramineous, stout, nearly equal, mostly equaling or exceeding tubercle, (0.5–)1–2.2 mm, prominently retrorsely spinulose; stamens 3(?); anthers dark yellow to stramineous, 1.2–1.5; styles 3-fid. <b>Achenes</b> falling with scales, dark brown, obpyriform, nearly eqilaterally- to greatly compressed-trigonous, angles slightly prominent, 1–1.3 × 0.75–0.9 mm, neck absent or short, finely rugulose at 20X with more than 20 horizontal ridges in vertical series, or reticulate or cancellate at 20–30X. <b>Tubercles</b> well developed, whitish, pyramidal, as high as wide to much lower than wide, 0.2–0.6 × 0.4–0.7 mm.</span><!--

-->{{Treatment/Body
|phenology=Fruiting summer–fall.
|habitat=Wet fresh meadows, seeps, and lakeshores, in interior montane conifer forests and alpine zones
|elevation=700–3500 m
|distribution=Calif.;Oreg.
|discussion=<p><i>Eleocharis decumbens</i> is known only from Shasta and Tulare counties in California.</p><!--
--><p>Although <i>Eleocharis decumbens</i> has long been ignored or treated as a variety of <i>E. montevidensis</i>, it clearly is a very distinct species, from which it differs especially in its thick rhizomes with fibrous scales and its acute floral scales.</p><!--
--><p>Specimens of <i>Eleocharis decumbens</i> without rhizomes or achenes are easily confused with the apparently closely related <i>E. bolanderi</i>, which often may be distinguished by culms no more than 0.5 mm wide and spikelets with scales no more than 3 mm long. The tubercles of <i>E. decumbens</i> are usually well differentiated from the achenes and about as high as wide; the tubercles of <i>E. bolanderi</i> are often poorly developed and much lower than wide. Three collections from Jackson and Klamath counties in Oregon, lack achenes but are probably <i>E. decumbens</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eleocharis decumbens
|authority=C. B. Clarke
|rank=species
|parent rank=series
|synonyms=Eleocharis montevidensis var. decumbens
|basionyms=
|family=Cyperaceae
|phenology=Fruiting summer–fall.
|habitat=Wet fresh meadows, seeps, and lakeshores, in interior montane conifer forests and alpine zones
|elevation=700–3500 m
|distribution=Calif.;Oreg.
|reference=None
|publication title=Bull. Misc. Inform., addit. ser.
|publication year=1908
|special status=Illustrated;Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V23/V23_110.xml
|genus=Eleocharis
|subgenus=Eleocharis subg. Eleocharis
|section=Eleocharis sect. Eleocharis
|series=Eleocharis (sect. Eleocharis) ser. Eleocharis
|species=Eleocharis decumbens
}}<!--

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