View source for Eupatorium semiserratum

{{Treatment/ID
|accepted_name=Eupatorium semiserratum
|accepted_authority=de Candolle in A. P. de Candolle and A. L. P. P. 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-d0_s0" data-properties="whole-organism some measurement;whole-organism duration"><b>Perennials,</b> 40–100+ cm.</span> <span class="statement" id="st-d0_s1" data-properties="stem quantity;stem architecture;stem pubescence"><b>Stems </b>(from short rhizomes) single, densely branched distally, puberulent throughout.</span> <span class="statement" id="st-d0_s2" data-properties=""><b>Leaves </b>usually opposite (distal sometimes alternate, lateral buds dormant or producing 1 pair of leaves);</span> <span class="statement" id="st-d0_s3" data-properties="leaf arrangement;leaf architecture;leaf architecture;leaf architecture">simple, sessile or subsessile;</span> <span class="statement" id="st-d0_s4" data-properties="blade architecture;blade position or shape;blade arrangement or shape;blade atypical length;blade length;blade width;base shape;margin architecture or shape;apex shape;face pubescence;face pubescence">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 glanddotted.</span> <span class="statement" id="st-d0_s5" data-properties="array architecture"><b>Heads </b>in corymbiform arrays.</span> <span class="statement" id="st-d0_s6" data-properties="phyllary quantity;phyllary arrangement or shape;phyllary length;phyllary width;series quantity;apex shape;abaxial face pubescence"><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, glanddotted.</span> <span class="statement" id="st-d0_s7" data-properties="floret quantity"><b>Florets </b>5;</span> <span class="statement" id="st-d0_s8" data-properties="corolla some measurement">corollas 2.5–3 mm.</span> <span class="statement" id="st-d0_s9" data-properties="cypsela some measurement"><b>Cypselae </b>1.5–2 mm;</span> <span class="statement" id="st-d0_s10" data-properties="bristle quantity;bristle some measurement;2n chromosome quantity">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>Eupatorium semiserratum has been included within E. glaucescens (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 E. lancifolium 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 E. rotundifolium var. scabridum (E. pubescens) represents hybrids between E. semiserratum and E. rotundifolium; it also apparently hybridizes with E. hyssopifolium.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Eupatorium semiserratum
|authority=de Candolle in A. P. de Candolle and A. L. P. P. 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://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V21_1187.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eupatorium
|species=Eupatorium semiserratum
|2n chromosome quantity=20
|abaxial face pubescence=puberulent
|apex shape=rounded;acute
|array architecture=corymbiform
|base shape=cuneate
|blade architecture=3-nerved
|blade arrangement or shape=elliptic to lance-elliptic
|blade atypical length=30mm;50mm
|blade length=50mm;70mm
|blade position or shape=distal
|blade width=5mm;25mm
|bristle quantity=30;40
|bristle some measurement=2.5mm;3mm
|corolla some measurement=2.5mm;3mm
|cypsela some measurement=1.5mm;2mm
|face pubescence=villous;puberulent
|floret quantity=5
|leaf architecture=subsessile;sessile;simple
|leaf arrangement=opposite
|margin architecture or shape=serrate
|phyllary arrangement or shape=elliptic
|phyllary length=1mm;3mm
|phyllary quantity=7;10
|phyllary width=0.5mm;1mm
|series quantity=2;3
|stem architecture=branched
|stem pubescence=puberulent
|stem quantity=single
|whole-organism duration=perennial
|whole-organism some measurement=40cm;100cm
}}<!--

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