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{{Treatment/ID
|accepted_name=Euphorbia mercurialina
|accepted_authority=Michaux
|publications={{Treatment/Publication
|title=Fl. Bor.-Amer.
|place=2: 212. 1803
|year=1803
}}
|common_names=Mercury spurge
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Tithymalopsis mercurialina
|authority=(Michaux) Small
|rank=species
}}
|hierarchy=Euphorbiaceae;Euphorbia;Euphorbia sect. Alectoroctonum;Euphorbia mercurialina
|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. Alectoroctonum]]</div><div class="higher-taxon"><small>species</small>[[Euphorbia mercurialina]]</div></div>
|volume=Volume 12
|mention_page=page 240, 242
|treatment_page=page 249
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> perennial, with thickened, spreading rootstock. <b>Stems</b> erect, unbranched or branched, solitary or few, previous year's dead stems not persistent, 20–33 cm, glabrous or villous to lanate. <b>Leaves</b> alternate; stipules 0.1–0.2 mm; petiole (1–)2.5–5(–6) mm, ciliate to lanate; blade elliptic to ovate-deltate, proximal greatly reduced, scalelike, 34–55 × 20–26 mm, base rounded or cuneate, margins entire, densely ciliate, apex rounded to acute, abaxial surface sparsely pilose to villous (to lanate on midrib), adaxial surface glabrous; venation obscure, only midvein conspicuous. <b>Cyathia</b> usually in terminal pleiochasia, rarely dichasia; peduncle 1.3–2.7 mm (to 40–70 mm for central cyathium), filiform, glabrous. <b>Involucre</b> campanulate or hemispheric, 1.5–2.5 × 2–3 mm, glabrous; glands 5, green, elliptic-reniform, 0.5 × 2 mm; appendages white, narrowly transversely-oblong to lunate, 0.6 × 2.5 mm, slightly erose. <b>Staminate</b> flowers 10–15. <b>Pistillate</b> flowers: ovary glabrous; styles 0.7–1.5 mm, 2-fid at apex. <b>Capsules</b> depressed-globose, 2.3–3.3 × 4.4–5 mm, glabrous; columella 2.7–3 mm. <b>Seeds</b> tan to dark brown, ovoid, 2.2 × 1.6 mm, with shallow and coarse depressions; caruncle absent.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting spring.
|habitat=Dry to mesic wooded slopes and ravines.
|elevation=100–600 m.
|distribution=Ala.;Ga.;Ky.;N.C.;Tenn.
|discussion=<p><i>Euphorbia mercurialina</i> is restricted primarily to the Cumberland Plateau and southern Appalachians, with disjunct occurrences in south-central North Carolina in the lower Piedmont. The North Carolina plants are markedly hairier than plants elsewhere, with villous or lanate stems, petioles, and abaxial leaf midribs. <i>Euphorbia mercurialina</i> has been reported from Florida and Virginia in the past. The Virginia plants were apparently planted (A. S. Weakley 2010), and the Florida reports are most certainly in error.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Euphorbia mercurialina
|authority=Michaux
|rank=species
|parent rank=section
|synonyms=Tithymalopsis mercurialina
|basionyms=
|family=Euphorbiaceae
|phenology=Flowering and fruiting spring.
|habitat=Dry to mesic wooded slopes and ravines.
|elevation=100–600 m.
|distribution=Ala.;Ga.;Ky.;N.C.;Tenn.
|reference=None
|publication title=Fl. Bor.-Amer.
|publication year=1803
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V12/V12_585.xml
|genus=Euphorbia
|section=Euphorbia sect. Alectoroctonum
|species=Euphorbia mercurialina
}}<!--

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