View source for Conyza canadensis

{{Treatment/ID
|accepted_name=Conyza canadensis
|accepted_authority=(Linnaeus) Cronquist
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=70: 632. 1943
|year=1943
}}
|common_names=Vergerette du Canada
|basionyms={{Treatment/ID/Basionym
|name=Erigeron canadensis
|authority=Linnaeus
|publication_title=Sp. Pl.
|publication_place=2: 863. 1753 (as canadense)
}}
|synonyms={{Treatment/ID/Synonym
|name=Conyza canadensis var. glabrata
|authority=(A. Gray) Cronquist
}} {{Treatment/ID/Synonym
|name=Conyza canadensis var. pusilla
|authority=(Nuttall) Cronquist
}} {{Treatment/ID/Synonym
|name=Conyza parva
|authority=unknown
}} {{Treatment/ID/Synonym
|name=E. canadensis var. pusillus
|authority=(Nuttall) B. Boivin
}}
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Conyza;Conyza canadensis
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Astereae]]</div><div class="higher-taxon"><small>genus</small>[[Conyza]]</div><div class="higher-taxon"><small>species</small>[[Conyza canadensis]]</div></div>
|volume=Volume 20
|mention_page=page 349
|treatment_page=page 350
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>erect, (3–)50–200(–350+) cm, branched mostly distally. <b>Leaves</b>: faces usually glabrate (proximal margins ± ciliolate, hairs usually stiff, spreading and hispid on nerves, hairs erect); proximal blades oblanceolate to linear, 20–50(–100+) × 4–10(–15+) mm, toothed to entire; distal similar, smaller, entire. <b>Heads</b> usually in paniculiform, sometimes corymbiform arrays. <b>Involucres</b> 3–4 mm. <b>Phyllaries</b> usually glabrous, sometimes sparsely strigose (margins chartaceous to scarious); outer greenish to stramineous, lanceolate to linear, shorter; inner stramineous to reddish, lance-attenuate to linear. <b>Receptacles</b> 1–1.5(–3) mm diam. in fruit. <b>Pistillate</b> florets 20–30(–45+); corollas ± equaling or surpassing styles, laminae 0.3–1 mm. <b>Disc</b> florets 8–30+. <b>Cypselae</b> uniformly pale tan to light gray-brown, 1–1.5 mm, faces sparsely strigillose; pappi of 15–25, white bristles 2–3 mm. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering year round, mostly summer–fall.
|habitat=Disturbed places
|elevation=0–2000 m
|distribution=Alta.;B.C.;Man.;N.S.;Ont.;P.E.I.;Que.;Sask.;Ala.;Ariz.;Ark.;Calif.;Colo.;Conn.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico;Central America;introduced in South America;Europe;Asia;Africa.
|discussion=<p><i>Conyza canadensis</i> is thought to be native to North America and is now widely adventive, e.g., in South America, Europe, Asia, and Africa. Plants with stems glabrous and phyllaries red-tipped are sometimes treated as var. pusilla; similar plants with stems glabrous and phyllaries stramineous (not red-tipped) are sometimes treated as <i></i></i>var.<i><i> glabrata</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Conyza canadensis
|author=
|authority=(Linnaeus) Cronquist
|rank=species
|parent rank=genus
|synonyms=Conyza canadensis var. glabrata;Conyza canadensis var. pusilla;Conyza parva;E. canadensis var. pusillus
|basionyms=Erigeron canadensis
|family=Asteraceae
|phenology=Flowering year round, mostly summer–fall.
|habitat=Disturbed places
|elevation=0–2000 m
|distribution=Alta.;B.C.;Man.;N.S.;Ont.;P.E.I.;Que.;Sask.;Ala.;Ariz.;Ark.;Calif.;Colo.;Conn.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico;Central America;introduced in South America;Europe;Asia;Africa.
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1943
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_806.xml
|tribe=Asteraceae tribe Astereae
|genus=Conyza
|species=Conyza canadensis
}}<!--

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