View source for Chasmanthium laxum

{{Treatment/ID
|accepted_name=Chasmanthium laxum
|accepted_authority=(L.) H.O. Yates
|publications=
|common_names=Slender chasmanthium
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Uniola laxa
|authority=unknown
}}
|hierarchy=Poaceae;Poaceae subfam. Centothecoideae;Poaceae tribe Centotheceae;Chasmanthium;Chasmanthium laxum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Centothecoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Centotheceae]]</div><div class="higher-taxon"><small>genus</small>[[Chasmanthium]]</div><div class="higher-taxon"><small>species</small>[[Chasmanthium laxum]]</div></div>
|volume=Volume 25
|mention_page=
|treatment_page=page 346
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Culms </b>40-130 cm, to 1 mm thick at the nodes, unbranched, leafy for 50% of their height. <b>Sheaths</b> glabrous; collars glabrous; ligules 0.2-0.4 mm, entire; blades (8)15-35(40) cm long, 3-8(11) mm wide, linear-lanceolate, usually glabrous, sometimes sparsely pilose adaxially. <b>Panicles</b> (7)12-35(47) cm, contracted, erect; branches ascending to appressed; axils of panicle branches glabrous; pedicels 0.5-2.5 mm. <b>Spikelets</b> 4-9 mm long, 2-6 mm wide, with (2)3-5(7) florets, lower 1(2) florets sterile, fertile florets divergent to 45°. <b>Lower</b> glumes 1.3-3 mm, (1)3-5-veined; upper glumes 1.3-2.5 mm, 3-5-veined; calluses glabrous; fertile lemmas 2.9-4.5 mm, straight, 3-7-veined, keels not winged, apices scabridulous; paleas 2.3-3 mm; anthers 1.3-1.5 mm, the length invariant within a spikelet. <b>Caryopses</b> 1.9-2.2 mm, exposed at maturity. <b>2n</b> = 24.</span><!--

-->{{Treatment/Body
|distribution=Md.;N.J.;Okla.;Miss.;Tex.;La.;Pa.;Mo.;Del.;Ala.;D.C;Tenn.;N.C.;S.C.;Va.;Ark.;Ga.;N.Y.;Ky.;Fla.
|discussion=<p><i>Chasmanthium laxum</i> is almost completely sympatric with <i>C. sessiliflorum</i> in the southeastern United States, growing in similar habitats but extending farther into sphagnous stream heads, pine flatwoods, and pine savannahs. Yates (1966b) reported seeing putative, naturally occurring hybrids between <i>Chasmanthium ornithorhynchum</i> and <i>C. laxum</i> along streams of the outer coastal plain of Mississippi and Louisiana. In general appearance, the hybrids resemble <i>C. laxum</i>, their most striking difference being the enlarged, sterile spikelets.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Chasmanthium laxum
|author=
|authority=(L.) H.O. Yates
|rank=species
|parent rank=genus
|synonyms=Uniola laxa
|basionyms=
|family=Poaceae
|distribution=Md.;N.J.;Okla.;Miss.;Tex.;La.;Pa.;Mo.;Del.;Ala.;D.C;Tenn.;N.C.;S.C.;Va.;Ark.;Ga.;N.Y.;Ky.;Fla.
|reference=None
|publication title=
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V25/V25_1039.xml
|subfamily=Poaceae subfam. Centothecoideae
|tribe=Poaceae tribe Centotheceae
|genus=Chasmanthium
|species=Chasmanthium laxum
}}<!--

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