View source for Euphorbia davidii

{{Treatment/ID
|accepted_name=Euphorbia davidii
|accepted_authority=Subils
|publications={{Treatment/Publication
|title=Kurtziana
|place=17: 125, figs. 1, 2H–J. 1984
|year=1984
}}
|common_names=Toothed spurge
|basionyms=
|synonyms=
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Poinsettia;Euphorbia davidii
|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 davidii]]</div></div>
|volume=Volume 12
|mention_page=page 318, 321
|treatment_page=page 320
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual, with taproot. <b>Stems</b> erect or ascending, 20–70 cm, both coarsely and sparsely hirsute and closely strigillose; branches usually ± straight, occasionally proximal branches arcuate. <b>Leaves</b> usually opposite, occasionally alternate at distal nodes; petiole 7–25 mm, strigose; blade usually narrowly to broadly elliptic, occasionally lance-elliptic, 10–100 × 5–35 mm, base cuneate to attenuate, margins coarsely crenate-dentate, strigose, revolute to nearly flat, apex broadly acute to acuminate, or obtuse, abaxial surface strigose with stiff, strongly tapered hairs, adaxial surface sparsely strigose-hirsute; venation pinnate, midvein prominent. <b>Cyathial</b> arrangement: terminal pleiochasial branches usually 3, occasionally reduced to congested cyme, 1–2-branched; pleiochasial bracts 2–4, often whorled, green with diffuse greenish white to mauve near base, similar in shape and size to distal leaves or slightly narrower; dichasial bracts similar in shape to distal leaves but smaller, often highly reduced. <b>Cyathia</b>: peduncle 0.5–1 mm. <b>Involucre</b> cylindric, 2.5–3 × 1.3–1.8 mm, glabrous; involucral lobes divided into 5–7 linear, papillate lobes; gland 1, yellow-green, sessile and broadly attached, 0.9 × 1.3 mm, opening oblong, glabrous; appendages absent. <b>Staminate</b> flowers 5–8. <b>Pistillate</b> flowers: ovary glabrous or sparsely strigose; styles 1 mm, 2-fid 1/2 to nearly entire length. <b>Capsules</b> broadly ovoid, 2.9–3.3 × 4–4.8 mm, 3-lobed, glabrous; columella 2.2–2.7 mm. <b>Seeds</b> black to brown or pale gray, ovoid to triangular-ovoid, angular in cross section, 2.4–2.9 × 2.2–2.9 mm, low-tuberculate, tubercles irregularly arranged or in faint, transverse row; caruncle 0.9–1.1 mm. <b>2n</b> = 56.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting summer–fall.
|habitat=Forests, stream and riverbanks, prairies, roadsides and open disturbed areas.
|elevation=200–1500 m.
|distribution=Ont.;Que.;Ariz.;Ark.;Calif.;Colo.;Fla.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Mass.;Mich.;Minn.;Mo.;Nebr.;N.J.;N.Mex.;N.Y.;N.C.;Ohio;Okla.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;W.Va.;Wis.;Wyo.;Mexico (Chihuahua;Coahuila;Sonora);introduced in South America;Eurasia (China;Russia);Australia.
|discussion=<p><i>Euphorbia davidii</i> is native from the southwestern United States and northern Mexico north through the southern Great Plains; it apparently is adventive elsewhere. The species is the weediest member of the <i>E. dentata</i> species group (following M. H. Mayfield 1997) and has become an agricultural weed in North America, South America (for example, Argentina), and in the Old World (particularly Australia and Russia). <i>Euphorbia davidii</i> can be distinguished from the closely similar <i>E. dentata</i> by its larger capsules and seeds, often more elliptic leaves, and shorter, stiffer hairs.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Euphorbia davidii
|authority=Subils
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting summer–fall.
|habitat=Forests, stream and riverbanks, prairies, roadsides and open disturbed areas.
|elevation=200–1500 m.
|distribution=Ont.;Que.;Ariz.;Ark.;Calif.;Colo.;Fla.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Mass.;Mich.;Minn.;Mo.;Nebr.;N.J.;N.Mex.;N.Y.;N.C.;Ohio;Okla.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;W.Va.;Wis.;Wyo.;Mexico (Chihuahua;Coahuila;Sonora);introduced in South America;Eurasia (China;Russia);Australia.
|reference=None
|publication title=Kurtziana
|publication year=1984
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V12/V12_775.xml
|genus=Euphorbia
|section=Euphorbia sect. Poinsettia
|species=Euphorbia davidii
}}<!--

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