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>Euphorbia angusta, 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 E. acuta 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/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V12/V12_396.xml
|genus=Euphorbia
|section=Euphorbia sect. Anisophyllum
|species=Euphorbia angusta
}}<!--

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