View source for Eutrochium

{{Treatment/ID
|accepted_name=Eutrochium
|accepted_authority=Rafinesque
|publications={{Treatment/Publication
|title=New Fl.
|place=4: 78. 1838
|year=1838
}}
|common_names=Joepyeweed;eupatoire
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Eupatoriadelphus
|authority=R. M. King & H. Robinson
}} {{Treatment/ID/Synonym
|name=Eupatorium sect. Verticillatum
|authority=de Candolle
}}
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eutrochium
|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>
|etymology=Greek eu- , well, truly, and trocho- , wheel-like, alluding to whorled leaves
|volume=Volume 21
|mention_page=page 461, 462, 475
|treatment_page=page 474
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 30–350+ cm. <b>Stems</b> (sometimes ± purple, sometimes glaucous, internodes usually shorter than leaves) erect, unbranched. <b>Leaves</b> mostly cauline; mostly whorled (3–7 per node), rarely opposite; petiolate; blades pinnately veined or ± 3-nerved from at or near bases, deltate-ovate, lance-elliptic, lanceolate, lance-ovate, or ovate (bases gradually or abruptly tapered), margins serrate (usually with gland at apex of each tooth, apices acuminate), abaxial faces usually gland-dotted and hirsute, puberulent, pubescent, scabrous, or stipitate-glandular, sometimes glabrate, adaxial faces mostly puberulent to scabrous-hirsute and glabrescent, sometimes glabrate or glabrous. <b>Heads</b> discoid, in (flat-topped or convex to rounded) compound, corymbiform arrays. <b>Involucres</b> cylindric, 2.5–7 mm diam. <b>Phyllaries</b> persistent, 10–22 in 5–6 series, (pale pink to purple, rarely white, tightly appressed) striate or 1-nerved, mostly lance-ovate to lanceolate, unequal (outer 2–3 obtuse, densely pubescent or glabrescent, often gland-dotted, innermost glabrous or glabrescent). <b>Receptacles</b> flat or convex, epaleate. <b>Florets</b> 4–22; corollas usually purplish or pinkish, rarely white, throats funnelform, lobes 5, ovate to deltate; styles: bases enlarged, puberulent, branches ± filiform to clavate (slightly dilated or flattened distally, papillose). <b>Cypselae</b> (dark brown to black or yellowish brown) prismatic, 5-ribbed, usually gland-dotted, sometimes scabrellous on ribs; pappi persistent, of 25–40 (cream to pinkish purple) barbellate bristles in 1 series. <b>x</b> = 10.</span><!--

-->{{Treatment/Body
|distribution=North America.
|discussion=<p>Species 5 (5 in the flora).</p><!--
--><p>Detailed distribution maps for taxa of <i>Eutrochium</i> are available but treated as taxa under <i>Eupatorium</i> (E. E. Lamont 1995).</p>
|tables=
|references={{Treatment/Reference
|id=lamont1995a
|text=Lamont, E. E. 1995. Taxonomy of Eupatorium section Verticillata (Asteraceae). Mem. New York Bot. Gard. 72: 1–66.
}}{{Treatment/Reference
|id=mackenzie1920a
|text=Mackenzie, K. K. 1920. Scientific names applicable to our purple-flowered eupatoriums. Rhodora 22: 157–165.
}}{{Treatment/Reference
|id=wiegand1937a
|text=Wiegand, K. M. and C. A. Weatherby. 1937. The nomenclature of the verticillate eupatoria. Rhodora 39: 297–306.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves usually ± 3-nerved and bases of blades abruptly contracted to petioles; florets (4–)5–9(–10) (near coast from South Carolina to New Hampshire and Nova Scotia)
|[[Eutrochium dubium|Eutrochium dubium]]
|-id=key-0-1
|1
|Leaves either pinnately veined or bases of blades gradually narrowed to petioles or both; florets 4–10 or 8–22
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Heads in ± flat-topped arrays; florets 8–22
|[[Eutrochium maculatum|Eutrochium maculatum]]
|-id=key-0-2
|2
|Heads in convex to rounded arrays; florets 4–10
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Stems usually glandular-pubescent throughout, sometimes densely puberulent and sparingly glandular; abaxial leaf faces ± glandular-pubescent and sparsely hirsute; s Appalachian Mountains of sw Virginia, e Kentucky, e Tennessee, and w NorthCarolina
|[[Eutrochium steelei|Eutrochium steelei]]
|-id=key-0-3
|3
|Stems glabrous proximal to heads; abaxial leaf faces sparingly and minutely gland-dotted; relatively widespread in e North America
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Stems purple at nodes, usually solid, rarely ± hollow near bases
|[[Eutrochium purpureum|Eutrochium purpureum]]
|-id=key-0-4
|4
|Stems purplish throughout (and glaucous), hollow
|[[Eutrochium fistulosum|Eutrochium fistulosum]]
|}
</div></div><!--

-->{{#Taxon:
name=Eutrochium
|author=Eric E. Lamont
|authority=Rafinesque
|rank=genus
|parent rank=tribe
|synonyms=Eupatoriadelphus;Eupatorium sect. Verticillatum
|basionyms=
|family=Asteraceae
|distribution=North America.
|reference=lamont1995a;mackenzie1920a;wiegand1937a
|publication title=New Fl.
|publication year=1838
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_1190.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eutrochium
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Eupatorieae]]