View source for Bidens cernua

{{Treatment/ID
|accepted_name=Bidens cernua
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 832. 1753
|year=1753
}}
|common_names=Bident penché
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Bidens cernua var. elliptica
|authority=Wiegand
|rank=variety
}} {{Treatment/ID/Synonym
|name=Bidens cernua var. integra
|authority=Wiegand
|rank=variety
}} {{Treatment/ID/Synonym
|name=Bidens cernua var. minima
|authority=(Hudson) Pursh
|rank=variety
}} {{Treatment/ID/Synonym
|name=Bidens cernua var. oligodonta
|authority=Fernald & H. St. John
|rank=variety
}} {{Treatment/ID/Synonym
|name=Bidens cernua var. radiata
|authority=de Candolle
|rank=variety
}} {{Treatment/ID/Synonym
|name=Bidens filamentosa
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Bidens glaucescens
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Bidens gracilenta
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Bidens minima
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Bidens prionophylla
|authority=
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Coreopsidinae;Bidens;Bidens cernua
|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 Coreopsidinae]]</div><div class="higher-taxon"><small>genus</small>[[Bidens]]</div><div class="higher-taxon"><small>species</small>[[Bidens cernua]]</div></div>
|volume=Volume 21
|mention_page=page 206, 208
|treatment_page=page 215
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> (2–)20–100(–400+) cm (stems sometimes rooting at proximal nodes). <b>Leaves</b> (rarely in 3s) sessile; blades lance-ovate or oblanceolate to lanceolate or linear, 40–100(–200+) × (2–)5–25(–45+) mm, bases cuneate to rounded, margins usually coarsely dentate to serrate, sometimes entire, sometimes ciliate, apices acute to acuminate, faces glabrous. <b>Heads</b> (erect or nodding at flowering, usually nodding in fruit) borne singly or in open, ± corymbiform arrays. <b>Peduncles</b> 10–40(–100+) mm. <b>Calyculi</b> of (3–)5–8(–10) spreading to reflexed, oblong to lance-linear, often ± foliaceous bractlets or bracts (3–)8–12(–25+) mm, margins usually ciliate, abaxial faces usually glabrous, bases sometimes hispidulous. <b>Involucres</b> ± hemispheric or broader, (3–)6–10 × (8–)12–20+ mm. <b>Phyllaries</b> 6–8+, ovate or lance-ovate to lanceolate, 2–10 mm. <b>Ray</b> florets usually 6–8, sometimes 0; laminae orange-yellow, 2–15(–18) mm. <b>Disc</b> florets (10–)40–100(–150+); corollas orange-yellow, 3–4 mm. <b>Cypselae</b> blackish or brown, usually ± flattened, sometimes ± 4-angled, ± cuneate, outer (3–)5–6+ mm, inner 4–8 mm, margins (± thickened or winged) retrorsely ciliate, apices ± truncate to convex, faces ± striate, glabrous or tuberculo-strigillose; pappi of (2–)4, ± erect, retrorsely barbed awns (1–)2–4 mm. <b>2n</b> = 24, 48.</span><!--

-->{{Treatment/Body
|phenology=Flowering late (Jul–)Aug–Sep(–Oct).
|habitat=Swamps, marshes, peat and sedge bogs, flood plains
|elevation=0–2300 m
|distribution=Alta.;B.C.;Man.;N.B.;N.W.T.;N.S.;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Europe;Asia.
|discussion=<p><i>Bidens cernua</i> is used medicinally to treat urinary-tract infections.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Bidens cernua
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Bidens cernua var. elliptica;Bidens cernua var. integra;Bidens cernua var. minima;Bidens cernua var. oligodonta;Bidens cernua var. radiata;Bidens filamentosa;Bidens glaucescens;Bidens gracilenta;Bidens minima;Bidens prionophylla
|basionyms=
|family=Asteraceae
|phenology=Flowering late (Jul–)Aug–Sep(–Oct).
|habitat=Swamps, marshes, peat and sedge bogs, flood plains
|elevation=0–2300 m
|distribution=Alta.;B.C.;Man.;N.B.;N.W.T.;N.S.;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Europe;Asia.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_522.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Coreopsidinae
|genus=Bidens
|species=Bidens cernua
}}<!--

-->[[Category:Treatment]][[Category:Bidens]]