View source for Eustachys

{{Treatment/ID
|accepted_name=Eustachys
|accepted_authority=Desv.
|publications=
|basionyms=
|synonyms=
|hierarchy=Poaceae;Poaceae subfam. Chloridoideae;Poaceae tribe Cynodonteae;Eustachys
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Poaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Poaceae subfam. Chloridoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Poaceae tribe Cynodonteae]]</div><div class="higher-taxon"><small>genus</small>[[Eustachys]]</div></div>
|volume=Volume 25
|mention_page=
|treatment_page=page 218
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>perennial; cespitose, shortly rhizomatous and often stoloniferous. <b>Culms</b> 20-150 cm, erect or decumbent, flattened, glabrous; internodes hollow. <b>Leaves</b> basal and cauline; sheaths open, keeled, strongly compressed, distinctly distichous, equitant; ligules to 0.5 mm, scarious, densely short ciliate; blades flat or folded, erect to spreading, both surfaces usually glabrous, sometimes scabrous or scabridulous. <b>Inflorescences</b> terminal, exceeding the upper leaves, panicles of 1-36 non-disarticulating spikelike branches; branches digitately arranged, axes triquetrous, with spikelets in 2 rows on the abaxial sides of the branches. <b>Spikelets</b> solitary, diverging strongly from the branch axes, laterally compressed, sessile or subsessile, with 2-3 florets; lowest florets bisexual; second florets usually reduced to a stipitate empty lemma, occasionally with a palea, staminate if a third floret is present; third florets, if present, sterile and usually rudimentary, stipitate; disarticulation above the glumes. <b>Glumes</b> unequal, 1-veined; lower glumes somewhat smaller than the upper glumes, narrow, acuminate; upper glumes almost as long as the spikelets, flattened, scarious, glabrous, green, pale, or purplish, veins antrorsely scabrous, apices truncate, bilobed, or bifid, often mucronate; lowest lemmas cartilaginous, light to dark brown, scabridulous distally, 3-veined, unawned, mucronate, or with a single awn, awns to 1.2 mm; paleas equaling or slightly shorter than the lemmas, glabrous, 2-veined, veins keeled, shortly ciliate or scabridulous; anthers 3, deep purple to purple-red. <b>Caryopses</b> 1-1.7 mm, trigonous-ellipsoid, glabrous, translucent when fresh, pale to slightly reddish-purple-tinged, x = 10.</span><!--

-->{{Treatment/Body
|distribution=Pa.;Miss.;Tex.;La.;Calif.;Puerto Rico;Virgin Islands;Ala.;N.C.;S.C.;Pacific Islands (Hawaii);Ga.;N.J.;N.Y.;Fla.
|discussion=<p><i>Eustachys</i>, as treated here, is a genus of approximately 12 species, most of which are native to the Western Hemisphere; four are native to the Flora region and three have been introduced. It is, in many ways, morphologically similar to <i>Chloris</i>, with the placement of a few species being problematic. Molecular data (Alice et al. 2000) support its recognition as a distinct genus, but the relationships between it, <i>Chloris</i> sensu stricto, and <i>Cynodon</i> are not clear.</p>
|tables=
|references={{Treatment/Reference
|id=alice2000a
|text=Alice, L.A., G.G. Borneo, and K.W. Hilu. 2000. Systematics of Chloris (Chloridoideae; Poaceae) and related genera: Evidence from nuclear ITS and chloroplast matK sequences. Amer. J. Bot. 87, Suppl.: 108-109
}}{{Treatment/Reference
|id=anderson1974c
|text=Anderson, D.E. 1974. Taxonomy of the genus Chloris (Gramineae). Brigham Young Univ. Sci. Bull., Biol. Ser. 19:1-133.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Lateral veins of the lowest lemma in each spikelet usually glabrous, occasionally with a few short, stiff hairs
|[[Eustachys glauca|Eustachys glauca]]
|-id=key-0-1
|1
|Lateral veins of the lowest lemma in each spikelet pubescent.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Keels of the lowest lemma in each spikelet glabrous.
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Spikelets 1.5-2.1 mm long; panicles with 6-15 branches; branches 4-10 cm long, straight, somewhat stiff; leaf blades 5-10 mm wide
|[[Eustachys retusa|Eustachys retusa]]
|-id=key-0-3
|3
|Spikelets 2.4-3 mm long; panicles with 10-36 branches; branches 6-15 cm long, flexible; leaf blades 10-15 mm wide
|[[Eustachys distichophylla|Eustachys distichophylla]]
|-id=key-0-2
|2
|Keels of the lowest lemma in each spikelet pubescent.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Spikelets 1.5-2.5 mm long; lowest lemma in each spikelet mucronate.
|[[#key-0-5| > 5]]
|-id=key-0-5
|5
|Lowest lemma in each spikelet dark brown, the lateral veins with appressed hairs shorter than 0.5 mm
|[[Eustachys petraea|Eustachys petraea]]
|-id=key-0-5
|5
|Lowest lemma in each spikelet tawny to reddish-brown, the lateral veins with spreading hairs longer than 0.5 mm
|[[Eustachys caribaea|Eustachys caribaea]]
|-id=key-0-4
|4
|Spikelets 2.6-3.7 mm long; lowest lemma in each spikelet awned, awns 0.4-1.2 mm.
|[[#key-0-6| > 6]]
|-id=key-0-6
|6
|Panicle branches 1-3; awns of lowest lemma in each spikelet 0.4-0.6 mm long; spikelets 3-3.7 mm long
|[[Eustachys floridana|Eustachys floridana]]
|-id=key-0-6
|6
|Panicle branches (3)4-9; awns of lowest lemma in each spikelet 0.7-1.2 mm long; spikelets 2.6-3 mm long
|[[Eustachys neglecta|Eustachys neglecta]]
|}
</div></div><!--

-->{{#Taxon:
name=Eustachys
|author=Cynthia Aulbach;
|authority=Desv.
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Poaceae
|distribution=Pa.;Miss.;Tex.;La.;Calif.;Puerto Rico;Virgin Islands;Ala.;N.C.;S.C.;Pacific Islands (Hawaii);Ga.;N.J.;N.Y.;Fla.
|reference=alice2000a;anderson1974c
|publication title=
|publication year=
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V25/V25_812.xml
|subfamily=Poaceae subfam. Chloridoideae
|tribe=Poaceae tribe Cynodonteae
|genus=Eustachys
}}<!--

-->[[Category:Treatment]][[Category:Poaceae tribe Cynodonteae]]