Bidens aristosa

(Michaux) Britton

Bull Torrey Bot. Club 20: 281. 1893.

IllustratedEndemic
Basionym: Coreopsis aristosa Michaux Fl. Bor.-Amer. 2: 140. 1803
Synonyms: Bidens aristosa var. fritcheyi Fernald Bidens aristosa var. mutica (A. Gray) Gattinger ex Fernald
Treatment appears in FNA Volume 21. Treatment on page 214. Mentioned on page 185, 206, 207.

Annuals, (15–)30–60(–150) cm. Leaves: petioles 10–30 mm; blades lanceolate to lance-linear overall, 30–80(–150) × 10–30(–50) mm, usually laciniately pinnatisect, primary lobes 3–7+, 15–60+ × 2–20 mm, bases cuneate, ultimate margins laciniate to serrate, ciliate, apices acuminate, faces glabrous or sparsely scabrellous. Heads in ± corymbiform arrays. Peduncles (10–)30–80+ mm. Calyculi of 8–12(–16) usually spreading to reflexed, linear, seldom foliaceous bractlets (4–)5–7(–12) mm, margins entire, ciliate, abaxial faces glabrous or ± scabrellous. Involucres ± hemispheric or broader, 6–8(–12) × 10–15 mm. Phyllaries 7–8(–13), lance-ovate to lance-linear, 6–8(–12) mm. Ray florets (5–)8–10+; laminae yellow, 10–25 mm. Disc florets (12–)20–40+; corollas yellowish, 2–3+ mm. Cypselae red-brown to blackish, ± flattened (unequally 3–4-angled), broadly cuneate, outer (4–)5–6 mm, inner 5–7 mm (lengths mostly 1.5–2.5 times widths), margins (± corky-winged) patently to antrorsely barbed, apices truncate to concave, faces weakly striate, sometimes tuberculate, glabrous or sparsely strigillose; pappi 0, or of 2(–4) spreading to divergent, antrorsely or retrorsely barbed awns (0.5–)2–4(–6) mm.


Phenology: Flowering Aug–Oct(–Nov).
Habitat: Marshes, meadows, pine forests, disturbed sites
Elevation: 0–300 m

Distribution

V21-520-distribution-map.gif

Ont., Ala., Ark., D.C., Ill., Ind., Ky., La., Md., Mich., Minn., Mo., N.C., S.C., Tenn., Tex., Va.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Bidens aristosa"
John L. Strother +  and Ronald R. Weedon +
(Michaux) Britton +
Coreopsis aristosa +
Ont. +, Ala. +, Ark. +, D.C. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Mich. +, Minn. +, Mo. +, N.C. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–300 m +
Marshes, meadows, pine forests, disturbed sites +
Flowering Aug–Oct(–Nov). +
Bull Torrey Bot. Club +
Illustrated +  and Endemic +
Bidens aristosa var. fritcheyi +  and Bidens aristosa var. mutica +
Bidens aristosa +
species +