View source for Parthenium hysterophorus

{{Treatment/ID
|accepted_name=Parthenium hysterophorus
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 988. 1753
|year=1753
}}
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ambrosiinae;Parthenium;Parthenium hysterophorus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Heliantheae]]</div><div class="higher-taxon"><small>subtribe</small>[[Asteraceae (tribe Heliantheae) subtribe Ambrosiinae]]</div><div class="higher-taxon"><small>genus</small>[[Parthenium]]</div><div class="higher-taxon"><small>species</small>[[Parthenium hysterophorus]]</div></div>
|volume=Volume 21
|mention_page=page 21
|treatment_page=page 22
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> (10–)30–120+ cm. <b>Leaf</b> blades ovate to elliptic, 30–180+ × 10–50(–90+) mm, (1–)2-pinnately lobed (ultimate lobes lanceolate to linear, 3–50 × 2–15 mm), faces sparsely to densely scabrellous and gland-dotted (seldom with additional erect hairs 1–2 mm). <b>Heads</b> obscurely radiate, borne in open, paniculiform arrays. <b>Peduncles</b> 1–8(–15+) mm. <b>Phyllaries</b>: outer 5(–6), lance-elliptic, 2–4 mm, inner 5(–6) ovate to ± orbiculate, 2.5–4 mm. <b>Pistillate</b> florets 5(–6); corolla laminae reniform or orbiculate to oblong, 0.3–1 mm. <b>Disc</b> florets 12–30[–60]. <b>Cypselae</b> obovoid, 1.5–2(–3.5) mm; pappus-like enations erect, deltate to ovate, 0.5–1 mm (sometimes a third, subulate spur near apex adaxially). <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–Nov.
|habitat=Disturbed sites
|elevation=0–300 m
|distribution=Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ill.;Kans.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Mex.;N.Y.;Ohio;Okla.;Pa.;Tex.;Va.;Mexico;introduced in subtropical;tropical;and warm-temperate New World and Old World.
|discussion=<p>In some places, especially in Old World, <i>Parthenium hysterophorus</i> causes serious contact dermatitis in humans. The plants should be handled with caution.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Parthenium hysterophorus
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|phenology=Flowering Mar–Nov.
|habitat=Disturbed sites
|elevation=0–300 m
|distribution=Ala.;Ark.;Conn.;Del.;D.C.;Fla.;Ill.;Kans.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.Mex.;N.Y.;Ohio;Okla.;Pa.;Tex.;Va.;Mexico;introduced in subtropical;tropical;and warm-temperate New World and Old World.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=Illustrated
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_36.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae
|genus=Parthenium
|species=Parthenium hysterophorus
}}<!--

-->[[Category:Treatment]][[Category:Parthenium]]