View source for Euphorbia ouachitana

{{Treatment/ID
|accepted_name=Euphorbia ouachitana
|accepted_authority=Mayfield
|publications={{Treatment/Publication
|title=J. Bot. Res. Inst. Texas
|place=7: 642, figs. 2[row 2, right], 6. 2013
|year=2013
}}
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia subg. Esula;Euphorbia ouachitana
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Euphorbiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Euphorbia]]</div><div class="higher-taxon"><small>subgenus</small>[[Euphorbia subg. Esula]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia ouachitana]]</div></div>
|volume=Volume 12
|mention_page=page 297
|treatment_page=page 306
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual, with taproot. <b>Stems</b> erect-ascending, often basally decumbent, often branched near base, 12–28 cm, glabrous. <b>Leaves</b>: petiole 0–3 mm; blade broadly oblanceolate to subspatulate, or proximalmost often orbiculate, 3–20 × 3–9 mm, base attenuate, margins entire, apex rounded to emarginate, surfaces glabrous; venation pinnate, midvein prominent. <b>Cyathial</b> arrangement: terminal pleiochasial branches 3, 1–3 times 2-branched; pleiochasial bracts ovate-deltate to subrhombic-ovate, shorter and wider than distal leaves; dichasial bracts connate 1/4 length, not imbricate, broadly deltate to subreniform, base truncate to broadly obtuse, margins entire, apex obtuse to bluntly acuminate; axillary cymose branches 1–5. <b>Cyathia</b>: peduncle 0.4–0.7 mm. <b>Involucre</b> infundibular, 1.3–1.6 × 1–1.2 mm, glabrous; glands 4, crescent-shaped; 0.4–0.5 × 0.8–1 mm; horns divergent, 0.2–0.4 mm. <b>Staminate</b> flowers 15–20. <b>Pistillate</b> flowers: ovary glabrous; styles 0.8 mm, 2-fid. <b>Capsules</b> ovoid-globose, 2.6–2.7 × 2.5–2.7 mm, slightly lobed; cocci rounded to ± flattened, smooth, glabrous; columella 2–2.1 mm. <b>Seeds</b> dark brown, oblong-ovoid, 1.5–2 × 1–1.6 mm, with deep, rounded pits in 3–4 regular vertical rows; caruncle reniform-ovate, conic, 0.5–0.7 × 0.5–0.8 mm. <b>2n</b> = 26.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting spring.
|habitat=Semiopen forests, bluffs and ledges, stream banks, glades.
|elevation=100–400 m.
|distribution=Ark.;Mo.;Okla.;Tenn.;Tex.
|discussion=<p><i>Euphorbia ouachitana</i> is restricted to semiopen forests and woodlands in the south-central United States. It is similar to <i>E. commutata</i> and has been most commonly identified as that species in the past. However, it differs in its consistently brown seeds that have pits in regular, vertical rows. The two species also differ in <i>E. commutata</i>’s numerous, proximal, long-petiolate elliptic leaves. The proximal leaves of <i>E. ouachitana</i> are spatulate with an orbiculate blade and petiolelike base. Aside from the restricted distribution of <i>E. ouachitana</i> in Missouri and Tennessee, the ranges of <i>E. ouachitana</i> and <i>E. commutata</i> do not overlap (see M. H. Mayfield 2013 for a detailed discussion of the distribution). <i>Euphorbia ouachitana</i> is most common in the Ouachita Mountains from southeastern Oklahoma to Hot Springs County, Arkansas.</p>
|tables=
|references=
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-->{{#Taxon:
name=Euphorbia ouachitana
|authority=Mayfield
|rank=species
|parent rank=subgenus
|synonyms=
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting spring.
|habitat=Semiopen forests, bluffs and ledges, stream banks, glades.
|elevation=100–400 m.
|distribution=Ark.;Mo.;Okla.;Tenn.;Tex.
|reference=None
|publication title=J. Bot. Res. Inst. Texas
|publication year=2013
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V12/V12_571.xml
|genus=Euphorbia
|subgenus=Euphorbia subg. Esula
|species=Euphorbia ouachitana
}}<!--

-->[[Category:Treatment]][[Category:Euphorbia subg. Esula]]