View source for Eutrochium dubium

{{Treatment/ID
|accepted_name=Eutrochium dubium
|accepted_authority=(Willdenow ex Poiret) E. E. Lamont
|publications={{Treatment/Publication
|title=Sida
|place=21: 901. 2004
|year=2004
}}
|common_names=Coastal plain joepyeweed;joepye thoroughwort
|basionyms={{Treatment/ID/Basionym
|name=Eupatorium dubium
|authority=Willdenow ex Poiret
|publication_title=in J. Lamarck et al., Encycl., suppl.
|publication_place=2: 606. 1812
}}
|synonyms={{Treatment/ID/Synonym
|name=Eupatoriadelphus dubius
|authority=(Willdenow ex Poiret) R. M. King & H. Robinson
}} {{Treatment/ID/Synonym
|name=Eupatorium americanum
|authority=Hill
}} {{Treatment/ID/Synonym
|name=Eupatorium ternifolium
|authority=Elliott
}}
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eutrochium;Eutrochium dubium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Eupatorieae]]</div><div class="higher-taxon"><small>genus</small>[[Eutrochium]]</div><div class="higher-taxon"><small>species</small>[[Eutrochium dubium]]</div></div>
|volume=Volume 21
|mention_page=
|treatment_page=page 475
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>40–120(–170) cm. <b>Stems</b> usually purple-spotted, sometimes uniformly purple, solid, glabrous proximally, glandular-puberulent distally. <b>Leaves</b> mostly in 3s–4s; petioles 7–25 mm, glabrous; blades usually ± 3-nerved, rarely pinnately veined, deltate-ovate or ovate to lance-ovate, 5–16 × 2–8 cm, relatively thick and firm (often rugose), bases usually abruptly contracted to petioles, margins coarsely serrate, abaxial faces densely gland-dotted and sparingly hirsute (at least on midribs and main veins), adaxial faces scabrous, glabrescent. <b>Heads</b> usually in ± convex, sometimes flat-topped, corymbiform arrays. <b>Involucres</b> often purplish, 6.5–9 × 2.5–5 mm. <b>Phyllaries</b> glabrous or sparsely hairy. <b>Florets</b> (4–)5–9(–10); corollas usually dark purple, rarely pinkish or white, 4.5–7 mm. <b>Cypselae</b> 3–4.5 mm. <b>2n</b> = 20.</span><!--

-->{{Treatment/Body
|phenology=Flowering late summer–early fall.
|habitat=Moist habitats, in sandy or gravelly, acid soils, open sun or partial shade
|elevation=0–50+ m
|distribution=N.S.;Conn.;Del.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.
|discussion=<p><i>Eutrochium dubium</i> is restricted to the coastal plain, and inland along major river systems, of eastern North America. Identification of <i>E. dubium</i> has been difficult for field botanists, as evidenced by misidentified herbarium specimens. The most prominent character distinguishing <i>E. dubium</i> from its relatives (especially <i>E. maculatum</i>) is the 3-nerved leaf venation: the proximalmost pair of lateral veins are more prominent and more prolonged than the others. This character is best observed on abaxial leaf faces.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eutrochium dubium
|author=
|authority=(Willdenow ex Poiret) E. E. Lamont
|rank=species
|parent rank=genus
|synonyms=Eupatoriadelphus dubius;Eupatorium americanum;Eupatorium ternifolium
|basionyms=Eupatorium dubium
|family=Asteraceae
|phenology=Flowering late summer–early fall.
|habitat=Moist habitats, in sandy or gravelly, acid soils, open sun or partial shade
|elevation=0–50+ m
|distribution=N.S.;Conn.;Del.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;N.C.;Pa.;R.I.;S.C.;Vt.;Va.
|reference=None
|publication title=Sida
|publication year=2004
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_1191.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eutrochium
|species=Eutrochium dubium
}}<!--

-->[[Category:Treatment]][[Category:Eutrochium]]