View source for Eupatorium rotundifolium

{{Treatment/ID
|accepted_name=Eupatorium rotundifolium
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 837. 1753
|year=1753
}}
|common_names=Roundleaf thoroughwort
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eupatorium;Eupatorium rotundifolium
|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>[[Eupatorium]]</div><div class="higher-taxon"><small>species</small>[[Eupatorium rotundifolium]]</div></div>
|volume=Volume 21
|mention_page=page 464, 466, 467, 468, 470, 471, 473
|treatment_page=page 472
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 40–100+ cm. <b>Stems</b> (from short rhizomes) single, sparsely branched distally, puberulent. <b>Leaves</b> usually opposite (distal sometimes alternate, lateral buds dormant or producing 1 pair of leaves); sessile or subsessile; blades ± 3-nerved, usually ± deltate to orbiculate, sometimes ovate, 15–50(–70) × 15–40(–60) mm (lengths mostly 1–2 times widths), bases broadly rounded to truncate, margins crenate to serrate, apices acute, faces puberulent to villous, gland-dotted. <b>Heads</b> in corymbiform arrays. <b>Phyllaries</b> 8–10 in 2–3 series, elliptic to oblanceolate, 2–6 × 0.5–1.5 mm, apices acute, abaxial faces puberulent, gland-dotted. <b>Florets</b> 5; corollas 3–4 mm. <b>Cypselae</b> 2–3 mm; pappi of 30–40 bristles 3.5–4 mm.</span><!--

-->{{Treatment/Body
|distribution=Ala.;Ark.;Conn.;D.C.;Del.;Fla.;Ga.;Ind.;Ky.;La.;Mass.;Md.;Miss.;Mo.;N.C.;N.H.;N.J.;N.Y.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.
|discussion=<p>Varieties 3 (3 in the flora).</p><!--
--><p><i>Eupatorium rotundifolium</i> is one of the more variable species of the genus; its apparent propensity to hybridize with other species has led it to be described as a compilospecies and has complicated its delimitation. Hybrids with <i>E. perfoliatum</i> and <i>E. sessilifolium</i> are sufficiently distinctive to be treated here as distinctive entities (<i>E. ×cordigerum</i> and <i>E. godfreyanum</i>, respectively), and the varieties ovatum and scabridum have also been proposed to be of hybrid origin. The boundaries between varieties are indistinct and individual specimens may be difficult to place with confidence.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaf blades 3-nerved from bases, bases subtruncate to broadly cuneate, margins crenate
|[[Eupatorium rotundifolium var. rotundifolium|Eupatorium rotundifolium var. rotundifolium]]
|-id=key-0-1
|1
|Leaf blades 3-nerved distal to bases, bases broadly cuneate to cuneate, margins serrate
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaf blades 30–70 × 30–60 mm, broadest nearmiddles
|[[Eupatorium rotundifolium var. ovatum|Eupatorium rotundifolium var. ovatum]]
|-id=key-0-2
|2
|Leaf blades 20–50 × 15–30 mm, broadest nearbases
|[[Eupatorium rotundifolium var. scabridum|Eupatorium rotundifolium var. scabridum]]
|}
</div></div><!--

-->{{#Taxon:
name=Eupatorium rotundifolium
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=Ala.;Ark.;Conn.;D.C.;Del.;Fla.;Ga.;Ind.;Ky.;La.;Mass.;Md.;Miss.;Mo.;N.C.;N.H.;N.J.;N.Y.;Ohio;Okla.;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1183.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eupatorium
|species=Eupatorium rotundifolium
}}<!--

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[[Category:Treatment]]
[[Category:Eupatorium]]
[[Category:Revised Since Print]]