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 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. 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"
John L. Strother +  and Ronald R. Weedon +
Linnaeus +
Bident penché +
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 +
Swamps, marshes, peat and sedge bogs, flood plains +
Flowering late (Jul–)Aug–Sep(–Oct). +
Illustrated +
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 +