View source for Euphorbia capitellata

{{Treatment/ID
|accepted_name=Euphorbia capitellata
|accepted_authority=Engelmann in W. H. Emory
|publications={{Treatment/Publication
|title=Rep. U.S. Mex. Bound.
|place=2(1): 188. 1859
|year=1859
}}
|common_names=Head spurge;capitate sandmat
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Chamaesyce capitellata
|authority=(Engelmann) Millspaugh
|rank=species
}} {{Treatment/ID/Synonym
|name=C. pycnanthema
|authority=(Engelmann) Millspaugh
|rank=species
}} {{Treatment/ID/Synonym
|name=Euphorbia pycnanthema
|authority=Engelmann
|rank=species
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Anisophyllum;Euphorbia capitellata
|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 capitellata]]</div></div>
|volume=Volume 12
|mention_page=page 252, 255
|treatment_page=page 262
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual or perennial, with slender to thick and woody rootstock. <b>Stems</b> usually ascending (but ranging from decumbent to erect), 15–50 cm, glabrous, strigillose, or pilose. <b>Leaves</b> opposite; stipules distinct, filiform or divided into 2–3 subulate-filiform segments, without dark, circular glands at base, 0.6–1.5 mm, pilose; petioles 0.6–1.3 mm, glabrous, pilose, or strigillose; blade ovate to narrowly ovate, 4–19 × 2–8 mm, base asymmetric, one side strongly cordate, other side rounded to slightly cordate, margins entire or serrulate (commonly nearly entire with few scattered teeth, often slightly thickened), apex acute, surfaces often with red spot in center, glabrous, pilose, or strigillose; weakly 3-veined from base, usually only midvein conspicuous. <b>Cyathia</b> in dense, terminal capitate glomerules, with reduced, bractlike leaves subtending cyathia, at tips of main stems and short, leafy, axillary branches; peduncle 0.1–1.2 mm. <b>Involucre</b> narrowly obconic to narrowly campanulate, 0.8–1.6 × 0.7–1.3 mm, glabrous or pilose; glands 4, yellow-green to pink or maroon, circular to oblong, 0.2–0.4 × 0.2–0.5 mm; appendages white to light pink, oblong to reniform or flabellate, 0.2–1.1 × 0.5–1.7 mm, surfaces glabrous, distal margin entire. <b>Staminate</b> flowers 25–40. <b>Pistillate</b> flowers: ovary glabrous or pilose; styles 0.4–0.6 mm, 2-fid entire length. <b>Capsules</b> ovoid to oblate, 1.3–1.9 × 1.4–2.1 mm, glabrous or pilose; columella 1.1–1.7 mm. <b>Seeds</b> pink to pinkish gray, narrowly ovoid to narrowly ovoid-oblong, 4-angled or weakly 3-angled in cross section, 0.9–1.5 × 0.5–0.7 mm, irregularly dimpled, sometimes also with faint transverse ridges that do not pass through abaxial keel. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting year-round in response to sufficient moisture.
|habitat=Gravelly washes, rocky slopes, basaltic talus, disturbed roadsides, primarily desert scrub, desert grasslands, riparian forests, rarely oak-juniper woodlands.
|elevation=600–1600 m.
|distribution=Ariz.;N.Mex.;Tex.;Mexico (Baja California;Baja California Sur;Chihuahua;Coahuila;Sinaloa;Sonora).
|discussion=<p><i>Euphorbia capitellata</i> is a characteristic herb in the Sonoran Desert of southern Arizona, ranging east to extreme southwestern Texas. During peak flowering, plants are attractive due to the dense clusters of cyathia with well-developed involucral gland appendages.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Euphorbia capitellata
|authority=Engelmann in W. H. Emory
|rank=species
|parent rank=section
|synonyms=Chamaesyce capitellata;C. pycnanthema;Euphorbia pycnanthema
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting year-round in response to sufficient moisture.
|habitat=Gravelly washes, rocky slopes, basaltic talus, disturbed roadsides, primarily desert scrub, desert grasslands, riparian forests, rarely oak-juniper woodlands.
|elevation=600–1600 m.
|distribution=Ariz.;N.Mex.;Tex.;Mexico (Baja California;Baja California Sur;Chihuahua;Coahuila;Sinaloa;Sonora).
|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/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V12/V12_748.xml
|genus=Euphorbia
|section=Euphorbia sect. Anisophyllum
|species=Euphorbia capitellata
}}<!--

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