View source for Eleocharis equisetoides

{{Treatment/ID
|accepted_name=Eleocharis equisetoides
|accepted_authority=(Elliott) Torrey
|publications={{Treatment/Publication
|title=Ann. Lyceum Nat. Hist. New York
|place=3: 296. 1836
|year=1836
}}
|common_names=Horsetail spike-rush;jointed spike-rush (spikesedge);knotted spike-rush
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Scirpus equisetoides
|authority=Elliott
|rank=species
|publication_title=Sketch Bot. S. Carolina
|publication_place=1: 79. 1816
}}
|synonyms={{Treatment/ID/Synonym
|name=Eleocharis elliottii
|authority=A. Dietrich
|rank=species
}}
|hierarchy=Cyperaceae;Eleocharis;Eleocharis subg. Limnochloa;Eleocharis equisetoides
|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 equisetoides]]</div></div>
|volume=Volume 23
|mention_page=page 120
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; rhizomes 2–4 mm thick, soft to firm, longer internodes 2–8 cm, scales persistent, 7–8 mm, membranous, tubers absent. <b>Culms</b> terete, 50–100 cm × 5–8.4 mm, soft to firm, obscurely to clearly septate-nodulose throughout, internally hollow with complete transverse septa, closer together near the spikelet; plants never forming filiform, flaccid culms. <b>Leaves</b>: distal leaf sheaths persistent, membranous to thinly papery, apex acute to slightly acuminate. <b>Spikelets</b> not proliferous, 20–45 × 4–5(–8) mm; rachilla joints bearing prominent winglike remnants of floral scales; proximal scale empty, amplexicaulous, (2–)2.8–4.9 mm; floral scales 85–160, 1–3 per mm of rachilla, stramineous to pale brown, usually with pale to dark brown submarginal band, obovate to oblong, (4.8–)5.2–7 × 3–4.4 mm, cartilaginous, often membranous toward margins, margins broadly translucent, membranous, apex rounded to obtuse. <b>Flowers</b>: perianth bristles 3–8, stramineous to reddish, slender, vestigial to 2.5 mm, shorter than to equaling achene, smooth or obscurely retrorsely spinulose; anthers stramineous to red-striated, 2.6–3.2 mm; styles 2–3-fid. <b>Achenes</b> yellowish to reddish brown, obovoid, biconvex to obscurely compressed trigonous, 1.8–2.3 × 1.4–1.9 mm, obscurely sculptured or sometimes partially smooth at 10–15X, each face with 20–40 rows of linear, transversely elongated cells, lines separating cells obscure, apex with very short neck 0.6–0.8 mm wide. <b>Tubercles</b> dark brown, lamelliform, high-deltoid, 0.6–1.1 × 0.5–0.7 mm.</span><!--

-->{{Treatment/Body
|phenology=Fruiting late spring–late fall.
|habitat=Fresh ponds, lakes, marshes, streams, ditches, cypress swamps
|elevation=10–500 m
|distribution=Ont.;Ala.;Calif.;Conn.;Fla.;Ga.;Ind.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.Y.;N.C.;R.I.;S.C.;Tex.;Va.;Wis.
|discussion=<p>We have not seen voucher specimens for reports of <i>Eleocharis</i> equistoides from Arkansas and Tennessee. It is probably extirpated from Illinois, Missouri, and Wisconsin.</p><!--
--><p>Contrary to previous decriptions, sectioning of the culm reveals that the distance between the septa near the spikelet cannot be used to distinguish the two septate species, <i>E. equisetoides</i> and <i>E. interstincta</i>, which when achenes are absent are better distinguished by the septate-nodulose distal parts of the culms of E. equisetiodes.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eleocharis equisetoides
|authority=(Elliott) Torrey
|rank=species
|parent rank=subgenus
|synonyms=Eleocharis elliottii
|basionyms=Scirpus equisetoides
|family=Cyperaceae
|phenology=Fruiting late spring–late fall.
|habitat=Fresh ponds, lakes, marshes, streams, ditches, cypress swamps
|elevation=10–500 m
|distribution=Ont.;Ala.;Calif.;Conn.;Fla.;Ga.;Ind.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.Y.;N.C.;R.I.;S.C.;Tex.;Va.;Wis.
|reference=None
|publication title=Ann. Lyceum Nat. Hist. New York
|publication year=1836
|special status=Illustrated;Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V23/V23_182.xml
|genus=Eleocharis
|subgenus=Eleocharis subg. Limnochloa
|species=Eleocharis equisetoides
}}<!--

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