View source for Euphorbia exstipulata

{{Treatment/ID
|accepted_name=Euphorbia exstipulata
|accepted_authority=Engelmann in W. H. Emory
|publications={{Treatment/Publication
|title=Rep. U.S. Mex. Bound.
|place=2(1): 189. 1859
|year=1859
}}
|common_names=Squareseed or Clark Mountain spurge
|special_status={{Treatment/ID/Special_status
|code=F
|label=Selected by author to be illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Euphorbia exstipulata var. lata
|authority=Warnock & M. C. Johnston
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Poinsettia;Euphorbia exstipulata
|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>section</small>[[Euphorbia sect. Poinsettia]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia exstipulata]]</div></div>
|volume=Volume 12
|mention_page=page 239, 240, 317, 318
|treatment_page=page 322
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual, with slender taproot. <b>Stems</b> erect, 5–26 cm, uniformly puberulent to hispidulous or glabrous; branches arcuate. <b>Leaves</b> opposite; petiole 1–3 mm, often indistinct, glabrous or puberulent; blade linear to narrowly elliptic or ovate, 14–42 × 3–28 mm, base attenuate, margins coarsely serrate, occasionally revolute, apex acute to obtuse, abaxial surface sparsely hispidulous to strigillose, adaxial surface glabrous; midvein conspicuous. <b>Cyathial</b> arrangement: terminal cymose or dichasial branches usually 1–2, occasionally reduced to monochasia, 1–2-branched; pleiochasial bracts 2–4, often whorled, wholly green or paler green at base, similar in shape and size to distal leaves or slightly narrower; dichasial bracts similar in shape to distal leaves but smaller or highly reduced. <b>Cyathia</b>: peduncle 1–1.9 mm. <b>Involucre</b> turbinate to campanulate, 1.1–1.5 × 1–1.3 mm, glabrous, pilose or puberulent; involucral lobes divided into several linear lobes; glands 4(–5), yellow to pink, sessile and broadly attached, 0.2 × 0.3–0.4 mm, opening oblong to nearly circular, glabrous; appendages usually petaloid, white to pink, ovate to trapezoidal, occasionally absent, not incurved and covering glands, 0.2–0.4 × 0.3–0.8 mm, entire, undulate, or conspicuously divided into triangular segments, glabrous. <b>Staminate</b> flowers 10–12. <b>Pistillate</b> flowers: ovary puberulent on keels, styles 0.8–1.1 mm, 2-fid 1/2 to nearly entire length. <b>Capsules</b> broadly depressed-oblong to ovoid, 2.7–3.3 × 3.1–3.9 mm, puberulent (with appressed hairs usually concentrated on keels); columella 1.9–2.5 mm. <b>Seeds</b> white to gray or light brown, ovoid, bluntly 4-angled in cross section, 1.9–2.5 × 1.4–1.7 mm, tuberculate, often with 2 transverse ridges; caruncle 0.1 × 0.2 mm.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting summer–fall.
|habitat=Desert scrub, grasslands, mesquite savannas, oak and oak-juniper woodlands.
|elevation=800–2000 m.
|distribution=Ariz.;Calif.;N.Mex.;Tex.;Utah;Wyo.;Mexico (Chihuahua;Coahuila;Durango;Guanajuato;San Luis Potosí;Sonora;Zacatecas).
|discussion=<p><i>Euphorbia exstipulata</i> is native from Texas to California and northern Mexico. The species was found once in the late nineteenth century in Wyoming but has not been re-collected there. Broad-leaved plants have been segregated as var. lata, but the variation in leaf shape is continuous and no varieties are formally recognized here.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Euphorbia exstipulata
|author=
|authority=Engelmann in W. H. Emory
|rank=species
|parent rank=section
|synonyms=Euphorbia exstipulata var. lata
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting summer–fall.
|habitat=Desert scrub, grasslands, mesquite savannas, oak and oak-juniper woodlands.
|elevation=800–2000 m.
|distribution=Ariz.;Calif.;N.Mex.;Tex.;Utah;Wyo.;Mexico (Chihuahua;Coahuila;Durango;Guanajuato;San Luis Potosí;Sonora;Zacatecas).
|reference=None
|publication title=Rep. U.S. Mex. Bound.
|publication year=1859
|special status=Selected by author to be illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V12/V12_374.xml
|genus=Euphorbia
|section=Euphorbia sect. Poinsettia
|species=Euphorbia exstipulata
}}<!--

-->[[Category:Treatment]][[Category:Euphorbia sect. Poinsettia]]