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), lanceovate 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 redbrown 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"
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 +
(Michaux) Britton +
ciliate +  and barbellate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2 +  and 4 +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cuneate +
Coreopsis aristosa +
compound +  and simple +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
lanceolate;lance-linear +
10mm;30mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
erect +  and spreading or reflexed +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
barbellulate +  and barbellate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
redbrown +  and blackish +
cuneate +  and flattened +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
Ont. +, Ala. +, Ark. +, D.C. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Mich. +, Minn. +, Mo. +, N.C. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–300 m +
strigillose +  and glabrous +
tuberculate +  and scabrellous +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Marshes, meadows, pine forests, disturbed sites +
discoid +  and radiate +
disciform +  and discoid +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
whorled +  and opposite +
deltate +
barbed +  and entire +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2-carpellate +
less flat;slightly navicular +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering Aug–Oct(–Nov). +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
connate +  and distinct +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Bull Torrey Bot. Club +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
Illustrated +  and Endemic +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Bidens aristosa var. fritcheyi +  and Bidens aristosa var. mutica +
Bidens aristosa +
species +
laciniate to serrate +
60 cm600 mm <br />0.6 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and subshrub +