View source for Ambrosia trifida

{{Treatment/ID
|accepted_name=Ambrosia trifida
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 987. 1753
|year=1753
}}
|common_names=Giant ragweed;grande herbe à poux
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Ambrosia aptera
|authority=de Candolle
|rank=species
}} {{Treatment/ID/Synonym
|name=Ambrosia trifida var. integrifolia
|authority=(Muhlenberg ex Willdenow) Torrey & A. Gray
|rank=variety
}} {{Treatment/ID/Synonym
|name=Ambrosia trifida var. texana
|authority=Scheele
|rank=variety
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ambrosiinae;Ambrosia;Ambrosia trifida
|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>[[Ambrosia]]</div><div class="higher-taxon"><small>species</small>[[Ambrosia trifida]]</div></div>
|volume=Volume 21
|mention_page=page 11, 15
|treatment_page=page 14
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 30–150(–400+) cm. <b>Stems</b> erect. <b>Leaves</b> mostly opposite; petioles 10–30(–70+) mm; blades rounded-deltate to ovate or elliptic, 40–150(–250+) × 30–70(–200+) mm, usually some blades palmately 3(–5)-lobed, bases truncate to cuneate (sometimes decurrent onto petioles), margins usually toothed, rarely entire, abaxial and adaxial faces ± scabrellous and gland-dotted. <b>Pistillate</b> heads clustered, proximal to staminates; florets 1. <b>Staminate</b> heads: peduncles 1–3+ mm; involucres ± saucer-shaped, 2–4 mm diam., scabrellous (often with 1–3 black nerves); florets 3–25+. <b>Burs</b>: bodies ± pyramidal, 3–5(–7+) mm, glabrous or glabrate, spines 4–5, ± distal, ± acerose, 0.5–1 mm, tips straight (bases ± decurrent as ribs). <b>2n</b> = 24, 48.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jul–Nov.
|habitat=Disturbed sites, waste places, damp soils
|elevation=0–1600 m
|distribution=Alta.;B.C.;Man.;N.B.;N.S.;Ont.;P.E.I.;Que.;Sask.;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico (Chihuahua).
|discussion=<p>The name <i>Ambrosia</i> ×helenae Rouleau applies to hybrids between <i>A. artemisiifolia</i> and <i>A. trifida</i>. Hybrids between <i>A. bidentata</i> and <i>A. trifida</i> have been recorded. <i>Ambrosia trifida</i> may be no longer extant in British Columbia.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Ambrosia trifida
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Ambrosia aptera;Ambrosia trifida var. integrifolia;Ambrosia trifida var. texana
|basionyms=
|family=Asteraceae
|phenology=Flowering Jul–Nov.
|habitat=Disturbed sites, waste places, damp soils
|elevation=0–1600 m
|distribution=Alta.;B.C.;Man.;N.B.;N.S.;Ont.;P.E.I.;Que.;Sask.;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico (Chihuahua).
|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_13.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae
|genus=Ambrosia
|species=Ambrosia trifida
}}<!--

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