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+, lanceovate 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"
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 +
S. F. Blake +
ciliate +  and barbellate +
cuneate +
Coreopsis involucrata +
compound +  and simple +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
less deltate;ovate +
25mm;50mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 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 +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
brown +  and yellowish +
oblanceolate +  and cuneate +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
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 +
strigillose +, glabrous +  and hirtellous +
tuberculate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Marshes, bogs, flood plains, disturbed sites +
discoid +  and radiate +
disciform +  and discoid +
in open , more or less corymbiform arrays +, in 2s +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
turbinate;hemispheric +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
golden yellow +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
whorled +  and opposite +
deltate +
ciliate +  and barbed +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
2-carpellate +
less flat;slightly navicular +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Aug–Oct. +
connate +  and distinct +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Proc. Biol. Soc. Wash. +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
deltate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
B. polylepis var. retrorsa +
Bidens polylepis +
species +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
lanceolate;linear +
0.6 cm6 mm <br />0.006 m <br /> (2 cm20 mm <br />0.02 m <br />) +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +