View source for Euphorbia schizoloba

{{Treatment/ID
|accepted_name=Euphorbia schizoloba
|accepted_authority=Engelmann
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=5: 173. 1861
|year=1861
}}
|common_names=Mojave spurge
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Euphorbia incisa
|authority=Engelmann
|rank=species
}} {{Treatment/ID/Synonym
|name=Tithymalus incisus
|authority=(Engelmann) W. A. Weber
|rank=species
}} {{Treatment/ID/Synonym
|name=T. schizolobus
|authority=(Engelmann) Norton
|rank=species
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia subg. Esula;Euphorbia schizoloba
|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 schizoloba]]</div></div>
|volume=Volume 12
|mention_page=page 296, 300
|treatment_page=page 309
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, with thick rootstock. <b>Stems</b> slender, ascending, often sinuous, many, densely branched near base, 10–50 cm, usually glabrous, usually glaucous. <b>Leaves</b>: petiole 0–1 mm; blade broadly oblanceolate to obovate, 10–20 × 3–9 mm, base usually acute, occasionally short-attenuate, rarely obtuse, margins entire, apex usually acute, occasionally obtuse, acuminate to cuspidate, surfaces usually glabrous, usually glaucous; venation pinnate, sometimes obscure, midvein prominent. <b>Cyathial</b> arrangement: terminal pleiochasial branches (1–)3–4(–5), each 1–3 times 2-branched; pleiochasial bracts broadly ovate to subcordate, usually similar in size to, occasionally wider than, distal leaves; dichasial bracts distinct, broadly ovate to almost reniform, base obtuse, margins entire, apex obtuse, acuminate to cuspidate; axillary cymose branches 0–2(–4). <b>Cyathia</b>: peduncle 0.3–1 mm. <b>Involucre</b> campanulate to broadly turbinate, 2.2–3 × 2–2.5 mm, glabrous; glands 4, irregularly semicircular to trapezoidal or elliptic-truncate, 0.8–1.5 × 1–2.2, margins strongly crenate or dentate; horns usually absent, if present then straight, 0.1–0.2 mm, generally equaling teeth on gland margin. <b>Staminate</b> flowers 12–20. <b>Pistillate</b> flowers: ovary glabrous; styles 1–1.2 mm, 2-fid. <b>Capsules</b> oblong-ovoid, 3.5–4 × 3.8–5 mm, 3-lobed; cocci rounded, smooth, glabrous; columella 3.3–3.8 mm. <b>Seeds</b> gray to whitish, oblong cylindric, 2–3 × 1.5 mm, irregularly shallowly pitted to almost smooth; caruncle conic, 0.6 × 0.6 mm.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting spring–summer.
|habitat=Desert mountains and canyon slopes, rocky and gravelly soils.
|elevation=500–1800 m.
|distribution=Ariz.;Calif.;Nev.
|discussion=<p><i>Euphorbia schizoloba</i> is a desert perennial that occurs on bluffs and ledges in the Mojave and Sonoran Deserts. Sparsely pubescent plants of <i>E. schizoloba</i> are known from Arizona and are best represented by several collections from the Mazatzal and Sierra Ancha mountains in Gila County from between 1000 to 1800 meters. George Engelmann published two names for this species almost simultaneously in 1861 (<i>E. schizoloba</i> and E. incisa). Although the authors have not been able to determine which publication has priority, Engelmann himself cited E. incisa as a synonym of <i>E. schizoloba</i> (in W. H. Brewer et al. 1876–1880, vol. 2), as did J. B. S. Norton (1899). Also, the type specimen at MO was annotated by Engelmann as <i>E. schizoloba</i>, and there is no mention of the name E. incisa on the sheet.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Euphorbia schizoloba
|authority=Engelmann
|rank=species
|parent rank=subgenus
|synonyms=Euphorbia incisa;Tithymalus incisus;T. schizolobus
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting spring–summer.
|habitat=Desert mountains and canyon slopes, rocky and gravelly soils.
|elevation=500–1800 m.
|distribution=Ariz.;Calif.;Nev.
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1861
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V12/V12_314.xml
|genus=Euphorbia
|subgenus=Euphorbia subg. Esula
|species=Euphorbia schizoloba
}}<!--

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