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Bidens cernua L.
NODDING BUR-MARIGOLD
Nodding beggartick

Life   Plantae   Dicotyledoneae   Asteraceae   Bidens

Bidens cernua, Nodding Bur-maarigold
© Copyright Sheryl Pollock 2011 · 6
Bidens cernua, Nodding Bur-maarigold

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Bidens cernua
© Les Mehrhoff, 2008-2010 · 6
Bidens cernua
Bidens cernua, Nodding Beggartick backside flower, Howard County, Md ---.
© Copyright source/photographer · 5
Bidens cernua, Nodding Beggartick backside flower, Howard County, Md ---.

Bidens cernua, Nodding Beggartick, Howard County, Md ---.
© Copyright source/photographer · 5
Bidens cernua, Nodding Beggartick, Howard County, Md ---.
Bidens cernua
© Les Mehrhoff, 2008-2010 · 4
Bidens cernua

Bidens cernua
© Les Mehrhoff, 2008-2010 · 4
Bidens cernua
Bidens cernua
© Copyright Malcolm Storey 2011-2118 · 3
Bidens cernua

Bidens cernua
© Copyright Malcolm Storey 2011-2118 · 3
Bidens cernua
Bidens cernua
© Copyright Malcolm Storey 2011-2118 · 3
Bidens cernua

Bidens cernua, seed
© Copyright Seeds USID 2015 · 1
Bidens cernua, seed
Bidens cernua, leaf and flower
© Kay Yatskievych, 2003 · 1
Bidens cernua, leaf and flower

Associates · map
FamilyScientific name @ source (records)
Aphididae  Brachycaudus ( @ AMNH_PBI (8); NCSU_ENT (2)

Uroleucon ( @ NCSU (11)
Erysiphaceae  Erysiphe cichoracearum @ BPI (1)

Sphaerotheca castagnei @ BPI (3)

Sphaerotheca fuliginea @ BPI (1)

Sphaerotheca humuli @ BPI (12)
Mycosphaerellaceae  Cercospora bidentis @ BPI (1)

Cercospora megalopotamica @ BPI (1)

Cercospora umbrata @ BPI (5)
Peronosporaceae  Plasmopara halstedii @ BPI (2)
Protomycetaceae  Protomyces andinus @ BPI (1)

Protomyces gravidus @ BPI (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Bidens cernua L. Nodding Tick-seed
Asteraceae — Aster family
Native
Bidens cernua
White Clay Creek State Park -- Big Pond area
September 2001

Guide to Bidens of Delaware

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Photos copyright David G. Smith

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FNA | Family List | FNA Vol. 21 | Asteraceae | Bidens

17. Bidens cernua Linnaeus, Sp. Pl. 2: 832. 1753.

Bident penché

Bidens cernua var. elliptica Wiegand; B. cernua var. integra Wiegand; B. cernua var. minima (Hudson) Pursh; B. cernua var. oligodonta Fernald & H. St. John; B. cernua var. radiata de Candolle; B. filamentosa Rydberg; B. glaucescens Greene; B. gracilenta Greene; B. minima Hudson; B. prionophylla Greene

Annuals, (2—)20—100(—400+) cm (stems sometimes rooting at proximal nodes). Leaves (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. Heads (erect or nodding at flowering, usually nodding in fruit) borne singly or in open, ± corymbiform arrays. Peduncles 10—40(—100+) mm. Calyculi 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. Involucres ± hemispheric or broader, (3—)6—10 × (8—)12—20+ mm. Phyllaries 6—8+, ovate or lance-ovate to lanceolate, 2—10 mm. Ray florets usually 6—8, sometimes 0; laminae orange-yellow, 2—15(—18) mm. Disc florets (10—)40—100(—150+); corollas orange-yellow, 3—4 mm. Cypselae 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. 2 n = 24, 48.

Flowering late (Jul—)Aug—Sep(—Oct). Swamps, marshes, peat and sedge bogs, flood plains; 0—2300 m; 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.

Bidens cernua is used medicinally to treat urinary-tract infections.

Updated: 2020-10-25 09:29:55 gmt
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