Bidens polylepis

S. F. Blake

Proc. Biol. Soc. Wash. 35: 78. 1922.

Endemic
Basionym: Coreopsis involucrata Nuttall J. Acad. Nat. Sci. Philadelphia 7: 74. 1834,
Synonyms: B. polylepis var. retrorsa Sherff
Treatment appears in FNA Volume 21. Treatment on page 214. Mentioned on page 185, 206, 207.

Annuals (biennials), 30–100+ cm. Leaves: petioles 5–30 mm; blades ± deltate to ovate overall, 40–80(–150+) × 25–50(–80+) mm, usually laciniately 1-pinnatisect, ultimate lobes 3(–7), lanceolate to linear, 25–60(–120+) × (3–)6–20(–25) mm, bases cuneate, ultimate margins incised, dentate, or serrate, ciliate, apices acute to attenuate, faces glabrous or hirtellous to scabrellous. Heads borne singly or in 2s or 3s or in open, ± corymbiform arrays. Peduncles 10–20(–50) mm. Calyculi of 12–21+ spreading to reflexed, linear, seldom foliaceous bractlets (6–)8–12(–20+) mm, margins coarsely ciliate, abaxial faces glabrous or scabrellous. Involucres turbinate to hemispheric, 4–5 × 6–10 mm. Phyllaries 6–8+, lance-ovate to lanceolate, 4–7 mm. Ray florets 8; laminae golden yellow, 10–25+ mm. Disc florets (40–)60–100+; corollas yellow, 2.5–3 mm. Cypselae blackish or brown to yellowish, ± flattened, obovate or oblanceolate to cuneate, outer 5–7 mm, inner 7–8 mm (lengths mostly 1.5–2.5 widths), margins (± corky-winged) antrorsely barbed or ciliate, apices ± truncate, faces glabrous or strigillose, sometimes tuberculate; pappi 0, or of 2 divergent, retrorsely barbed awns or ± deltate scales 0.1–0.5(–1.5) mm. 2n = 24.


Phenology: Flowering Aug–Oct.
Habitat: Marshes, bogs, flood plains, disturbed sites
Elevation: 10–1500 m

Distribution

V21-521-distribution-map.gif

Ont., Ala., Ark., Colo., Ill., Ind., Iowa, Kans., La., Md., Mich., Mo., Nebr., N.J., N.Mex., N.C., Okla., Pa., S.C., Tenn., Tex., Va.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Bidens polylepis"
John L. Strother +  and Ronald R. Weedon +
S. F. Blake +
Coreopsis involucrata +
Ont. +, Ala. +, Ark. +, Colo. +, Ill. +, Ind. +, Iowa +, Kans. +, La. +, Md. +, Mich. +, Mo. +, Nebr. +, N.J. +, N.Mex. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +  and Va. +
10–1500 m +
Marshes, bogs, flood plains, disturbed sites +
Flowering Aug–Oct. +
Proc. Biol. Soc. Wash. +
B. polylepis var. retrorsa +
Bidens polylepis +
species +