View source for Euphorbia angusta

{{Treatment/ID
|accepted_name=Euphorbia angusta
|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=Blackfoot sandmat;narrow-leaf spurge
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Chamaesyce angusta
|authority=(Engelmann) Small
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Anisophyllum;Euphorbia angusta
|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. Anisophyllum]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia angusta]]</div></div>
|volume=Volume 12
|mention_page=page 254
|treatment_page=page 260
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, with moderately to strongly thickened rootstock. <b>Stems</b> erect, 12–43 cm, uniformly strigose. <b>Leaves</b> opposite; stipules distinct, linear-subulate or nodiform to papilliform nodiform to papilliform stipules often reddish brown, 0.1–0.7 mm, strigose; petiole 0.3–1.2 mm, strigose; blade: proximal ovate to ovate-elliptic, distal linear to elliptic-linear, 7–41 × 2–5 mm, distal leaf blades more than 6 times as long as wide, base asymmetric, cuneate to rounded, margins entire, often involute on drying, apex acute, surfaces usually short strigose, occasionally glabrous adaxially; venation pinnate, only midvein conspicuous. <b>Cyathia</b> solitary at distal nodes; peduncle 1.1–2.4 mm. <b>Involucre</b> turbinate to campanulate-turbinate, 1–1.5 × 1–1.4 mm, strigose; glands 4, green to yellow-green, concave, narrowly oblong, 0.2–0.4 × 0.4–0.7 mm; appendages white, flabellate, 0.5–1.1 × 0.3–0.5 mm, distal margin shallowly and irregularly toothed. <b>Staminate</b> flowers 16–26. <b>Pistillate</b> flowers: ovary strigose; styles 0.3–0.5 mm, 2-fid at apex to almost 1/2 length. <b>Capsules</b> broadly ovoid, 2–2.6 × 2.5–3 mm, strigose; columella 1.6–2.2 mm. <b>Seeds</b> white, ovoid, 4-angled in cross section, 1.7–2.2 × 1.1–1.2 mm, transversely low-ridged or wrinkled. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting early spring–fall.
|habitat=Rocky limestone soils.
|elevation=400–1200 m.
|distribution=Tex.;Mexico (Coahuila).
|discussion=<p><i>Euphorbia angusta</i>, which in the flora area is known from the trans-Pecos region to the Edwards Plateau, is easily recognized by its erect habit, linear leaves, and relatively showy involucral gland appendages with toothed margins. The species is closely related to <i>E. acuta</i> and the Mexican endemic E. johnstonii Mayfield (M. H. Mayfield 1991); it is not only morphologically distinctive but is also the only species in sect. Anisophyllum with C3 photosynthesis (R. F. Sage et al. 2011; T. L. Sage et al. 2011; G. L. Webster 1975).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Euphorbia angusta
|author=
|authority=Engelmann in W. H. Emory
|rank=species
|parent rank=section
|synonyms=Chamaesyce angusta
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting early spring–fall.
|habitat=Rocky limestone soils.
|elevation=400–1200 m.
|distribution=Tex.;Mexico (Coahuila).
|reference=None
|publication title=Rep. U.S. Mex. Bound.
|publication year=1859
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V12/V12_396.xml
|genus=Euphorbia
|section=Euphorbia sect. Anisophyllum
|species=Euphorbia angusta
}}<!--

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