View source for Eupatorium hyssopifolium

{{Treatment/ID
|accepted_name=Eupatorium hyssopifolium
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 836. 1753
|year=1753
}}
|common_names=Hyssopleaf thoroughwort
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Eupatorieae;Eupatorium;Eupatorium hyssopifolium
|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 hyssopifolium]]</div></div>
|volume=Volume 21
|mention_page=page 464, 470, 473
|treatment_page=page 468
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 50–100+ cm. <b>Stems</b> (from short caudices or rhizomes) single, sparsely branched distally, pubescent throughout. <b>Leaves</b> usually opposite or whorled (distal sometimes alternate, spreading or horizontal); simple, sessile; blades 3-nerved from bases (laterals sometimes weak), lance-linear, lance-oblong, or linear, 20–60 × 2–15 mm (lengths mostly 6–40 times widths), bases cuneate, margins entire, laciniate-serrate, or serrate, apices acute, faces scabrous (at least abaxial). <b>Heads</b> in corymbiform arrays. <b>Phyllaries</b> 8–10 in 2–3 series, elliptic to oblong, 1.5–5 × 1–1.5 mm, apices obtuse to acute (not mucronate), abaxial faces pubescent throughout (more densely distally). <b>Florets</b> 5; corollas 3–3.5 mm. <b>Cypselae</b> 2–3 mm; pappi of 20–30 bristles 3.5–4 mm.</span><!--

-->{{Treatment/Body
|distribution=Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ky.;La.;Mass.;Md.;Miss.;Mo.;N.C.;N.J.;N.Y.;Ohio;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Wis.
|discussion=<p>Varieties 2 (2 in the flora).</p><!--
--><p><i>Eupatorium hyssopifolium</i> includes both diploid and polyploid cytotypes and presents a complex situation taxonomically. The diploids are placed here in <i></i>var.<i> hyssopifolium</i>, which also includes polyploids and is characterized by relatively narrow leaves. Variety laciniatum has broader leaves and molecular data suggest that it arose through hybridization between <i></i>var.<i> hyssopifolium</i> and <i>E. serotinum</i>; the name E. torreyanum has been applied to plants of similar morphology, but these are hybrid derivatives of <i>E. serotinum</i> and <i>E. mohrii</i>. It has also been suggested that <i></i>var.<i> hyssopifolium</i> has hybridized with <i>E. album </i>var.<i> album</i> to form E. saltuense, and with diploids of <i>E. linearifolium</i> to form polyploid populations included here under <i>E. linearifolium</i>. <i>Eupatorium hyssopifolium</i> is characterized by a tendency for the leaves to be whorled, in 3s and 4s, and for axillary buds to produce leaves without expansion of shoots; the combination of whorled leaves and suppressed axillary shoots gives the nodes a somewhat tufted or verticillate appearance.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves mostly linear, 2–5 mm wide, margins usually entire or obscurely serrulate
|[[Eupatorium hyssopifolium var. hyssopifolium|Eupatorium hyssopifolium var. hyssopifolium]]
|-id=key-0-1
|1
|Leaves mostly lance-linear to lanceolate, 5–15 mm wide, margins usually laciniately toothed
|[[Eupatorium hyssopifolium var. laciniatum|Eupatorium hyssopifolium var. laciniatum]]
|}
</div></div><!--

-->{{#Taxon:
name=Eupatorium hyssopifolium
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ky.;La.;Mass.;Md.;Miss.;Mo.;N.C.;N.J.;N.Y.;Ohio;Pa.;R.I.;S.C.;Tenn.;Tex.;Va.;W.Va.;Wis.
|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_1167.xml
|tribe=Asteraceae tribe Eupatorieae
|genus=Eupatorium
|species=Eupatorium hyssopifolium
}}<!--

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