Bidens cernua

Linnaeus

Sp. Pl. 2: 832. 1753.

Common names: Bident penché
Illustrated
Synonyms: Bidens cernua var. elliptica Wiegand Bidens cernua var. integra Wiegand Bidens cernua var. minima (Hudson) Pursh Bidens cernua var. oligodonta Fernald & H. St. John Bidens cernua var. radiata de Candolle Bidens filamentosa Bidens glaucescens Bidens gracilenta Bidens minima Bidens prionophylla
Treatment appears in FNA Volume 21. Treatment on page 215. Mentioned on page 206, 208.

Annuals, (2–) 20–100 (–400+) cm (stems sometimes rooting at proximal nodes). Leaves (rarely in 3s) sessile; blades lanceovate 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 lanceovate 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. 2n = 24, 48.


Phenology: Flowering late (Jul–)Aug–Sep(–Oct).
Habitat: Swamps, marshes, peat and sedge bogs, flood plains
Elevation: 0–2300 m

Distribution

V21-522-distribution-map.gif

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

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

Selected References

None.

Lower Taxa

None.
... more about "Bidens cernua"
not tailed +, rounded +  and obtuse +
dark +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +  and Ronald R. Weedon +
Linnaeus +
ciliate +  and barbellate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
hispidulous +
cuneate +  and rounded +
compound +  and simple +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
oblanceolate;lanceolate or linear +
5mm;25mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
erect +  and spreading or reflexed +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
barbellulate +  and barbellate +
Bident penché +
orange-yellow +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
brown +  and blackish +
cuneate +, 4-angled +  and flattened +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
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 +  and Asia +
0–2300 m +
tuberculo-strigillose +, glabrous +  and striate +
tuberculate +, striate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Swamps, marshes, peat and sedge bogs, flood plains +
discoid +  and radiate +
disciform +  and discoid +
in open , more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
orange-yellow +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
whorled +  and opposite +
deltate +
entire +, usually coarsely dentate +  and serrate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-carpellate +
less flat;slightly navicular +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering late (Jul–)Aug–Sep(–Oct). +
connate +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
Illustrated +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
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 +  and Bidens prionophylla +
Bidens cernua +
species +
toothed +, serrate +, laciniate +  and dentate +
100 cm1,000 mm <br />1 m <br /> (400 cm4,000 mm <br />4 m <br />) +
20 cm200 mm <br />0.2 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +