View source for Eupatorium semiserratum

{{Treatment/ID
|accepted_name=Eupatorium semiserratum
|accepted_authority=de Candolle
|publications={{Treatment/Publication
|title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|place=5: 177. 1836
|year=1836
}}
|common_names=Smallflower thoroughwort
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Eupatorium cuneifolium var. semiserratum
|authority=(de Candolle) Fernald & Griscom
|rank=variety
}}
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eupatorium;Eupatorium semiserratum
|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 semiserratum]]</div></div>
|volume=Volume 21
|mention_page=page 464, 469
|treatment_page=page 473
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 40–100+ cm. <b>Stems</b> (from short rhizomes) single, densely branched distally, puberulent throughout. <b>Leaves</b> usually opposite (distal sometimes alternate, lateral buds dormant or producing 1 pair of leaves); simple, sessile or subsessile; blades ± 3-nerved distal to bases, elliptic to lance-elliptic, (30–)50–70 × 5–25 mm (lengths mostly 2–5 times widths), bases narrowly cuneate, margins usually serrate, apices acute, faces puberulent or villous, densely gland-dotted. <b>Heads</b> in corymbiform arrays. <b>Phyllaries</b> 7–10 in 2–3 series, elliptic, 1–3 × 0.5–1 mm, apices rounded to acute (not mucronate), abaxial faces puberulent, gland-dotted. <b>Florets</b> 5; corollas 2.5–3 mm. <b>Cypselae</b> 1.5–2 mm; pappi of 30–40 bristles 2.5–3 mm. <b>2n</b> = 20.</span><!--

-->{{Treatment/Body
|phenology=Flowering Aug–Sep.
|habitat=Moist to boggy, sandy, peaty soils, margins of pine flatwoods, gum swamps, bayheads, disturbed sites, roadsides
|elevation=10–100+ m
|distribution=Ala.;Ark.;Fla.;Ga.;La.;Miss.;N.C.;S.C.;Tenn.
|discussion=<p><i>Eupatorium semiserratum</i> has been included within <i>E. glaucescens</i> (E. cuneifolium); it is distinguished by its consistently smaller heads and stems that branch only within the capitulescences. It differs from the similar and sometimes sympatric <i>E. lancifolium</i> by its smaller heads, leaves 3-nerved distal to bases (rather than at bases), as well as preference for wetter habitats. It has been proposed that <i>E. rotundifolium </i>var.<i> scabridum</i> (E. pubescens) represents hybrids between <i>E. semiserratum</i> and <i>E. rotundifolium</i>; it also apparently hybridizes with <i>E. hyssopifolium</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eupatorium semiserratum
|authority=de Candolle
|rank=species
|parent rank=genus
|synonyms=Eupatorium cuneifolium var. semiserratum
|basionyms=
|family=Asteraceae
|phenology=Flowering Aug–Sep.
|habitat=Moist to boggy, sandy, peaty soils, margins of pine flatwoods, gum swamps, bayheads, disturbed sites, roadsides
|elevation=10–100+ m
|distribution=Ala.;Ark.;Fla.;Ga.;La.;Miss.;N.C.;S.C.;Tenn.
|reference=None
|publication title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|publication year=1836
|special status=Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1187.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eupatorium
|species=Eupatorium semiserratum
}}<!--

-->[[Category:Treatment]][[Category:Eupatorium]]