Bidens bipinnata

Linnaeus

Sp. Pl. 2: 832. 1753.

IntroducedIllustrated
Synonyms: Bidens bipinnata var. biternatoides Sherff
Treatment appears in FNA Volume 21. Treatment on page 210. Mentioned on page 207, 211.

Annuals, (15–)30–100(–150+) cm. Leaves: petioles 20–50 mm; blades rounded-deltate to ovate or lanceolate overall, (20–)30–70+ × (20–)30–60+ mm, (1–)2(–3)-pinnatisect, ultimate lobes obovate or lanceolate, 15–45+ × 10–25+ mm, bases truncate to cuneate, ultimate margins entire, sometimes ciliolate, apices rounded to acute or attenuate, faces usually glabrous, sometimes hirtellous. Heads usually borne singly, sometimes in ± corymbiform arrays. Peduncles (10–)20–50(–100) mm. Calyculi of (7–)8(–10) linear bractlets 3–5 mm, ± appressed, margins ciliate, abaxial faces usually glabrous. Involucres ± campanulate, 5–7 × 3–4(–5) mm. Phyllaries 8–12, lanceolate to linear, 4–6 mm. Ray florets 0 or 3–5+; laminae yellowish or whitish, 1–2(–3) mm. Disc florets 10–20(–30+); corollas yellowish to whitish, 2–3 mm. Cypselae red-brown, outer weakly obcompressed, 7–15 mm, inner ± 4-angled, linear to linear-fusiform, 12–18 mm, margins not ciliate, apices ± attenuate, faces 2-grooved, often tuberculate-hispidulous; pappi of (2–)3–4, erect to divergent, retrorsely barbed awns 2–4 mm. 2n = 24, 72.


Phenology: Flowering (Jun–)Aug–Sep(–Oct).
Habitat: Fields, forests, disturbed, wettish sites
Elevation: 10–1800 m

Distribution

V21-512-distribution-map.gif

N.B., Ont., Ala., Ariz., Ark., Conn., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Miss., Mo., Nebr., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va., South America, Europe, Asia, Pacific Islands.

Discussion

Bidens bipinnata is probably native in eastern Asia and introduced in South America, Europe, Asia, and Pacific Islands.

Selected References

None.

Lower Taxa

None.
... more about "Bidens bipinnata"
John L. Strother +  and Ronald R. Weedon +
Linnaeus +
N.B. +, Ont. +, Ala. +, Ariz. +, Ark. +, Conn. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, Nebr. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, South America +, Europe +, Asia +  and Pacific Islands. +
10–1800 m +
Fields, forests, disturbed, wettish sites +
Flowering (Jun–)Aug–Sep(–Oct). +
Introduced +  and Illustrated +
Bidens bipinnata var. biternatoides +
Bidens bipinnata +
species +