Bidens eatonii

Fernald

Rhodora 5: 92, plate 45, figs. 11–14. 1903.

Common names: Bident d’Eaton
Endemic
Synonyms: Bidens eatonii var. fallax Fernald Bidens eatonii var. illicita S. F. Blake Bidens eatonii var. interstes (Fassett) Fassett Bidens eatonii var. kennebecensis Fernald Bidens eatonii var. major Fassett Bidens eatonii var. mutabilis Fassett Bidens eatonii var. simulans Fassett
Treatment appears in FNA Volume 21. Treatment on page 218. Mentioned on page 208, 217.

Annuals, (10–) 25–70 (–150) cm. Leaves: petioles (narrowly, if at all, winged) 10–35+ mm; blades lanceovate to lanceolate, (20–) 35–100+ × 5–25+ mm, sometimes with 1–4 lobes near bases, bases cuneate, margins serrate, seldom ciliate, apices attenuate, faces glabrous. Heads borne singly or in 2s or 3s. Peduncles 10–35+ mm. Calyculi of (2–) 3–5 ± erect, oblanceolate to linear, ± foliaceous bractlets or bracts 7–25 (–70+) mm, margins sometimes obscurely ciliate, abaxial faces glabrous. Involucres usually cylindric to campanulate, rarely hemispheric, (4–) 8–10 (–12) × (4–) 7–9 mm. Phyllaries 5–6, oblong to lanceovate, 8–13 mm. Ray-florets usually 0, sometimes 1–3+; laminae yellow-orange, 2–5 (–10) mm. Disc-florets 7–30+; corollas yellowish, 2.5–3.5 mm. Cypselae blackish to purplish or red-brown,± flattened, sometimes 3–4-angled, narrowly oblanceolate, outer 5.5–10 mm, inner 6.5–11 mm, margins barbed or ciliate (proximally antrorsely, distally retrorsely), apices ± truncate, faces ± 1-nerved, glabrous or sparsely setulose, often ± striate and/or tuberculate, pappi of 2–4 (–5) erect to spreading, antrorsely or retrorsely barbed awns 3–4.5 mm. 2n = 48.


Phenology: Flowering Sep–Oct.
Habitat: Borders of estuaries, marshes, tidal flats
Elevation: 0–10 m

Distribution

V21-529-distribution-map.gif

N.B., P.E.I., Que., Conn., Maine, Mass., N.J., N.Y., R.I.

Discussion

Bidens eatonii may be better treated as part of B. tripartita.

Selected References

None.

Lower Taxa

None.
... more about "Bidens eatonii"
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 +
Fernald +
ciliate +  and barbellate +
erect +  and spreading +
2 +  and 4 +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
cuneate +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (10 cm100 mm <br />0.1 m <br />) +
lanceovate;lanceolate +
5mm;25mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
erect +  and spreading or reflexed +
0.7 cm7 mm <br />0.007 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
barbellulate +  and barbellate +
Bident d’Eaton +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
blackish +  and purplish or red-brown +
oblanceolate +, 3-4-angled +  and flattened +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and petiolate +
N.B. +, P.E.I. +, Que. +, Conn. +, Maine +, Mass. +, N.J. +, N.Y. +  and R.I. +
0–10 m +
setulose +  and glabrous +
tuberculate +  and striate +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Borders of estuaries, marshes, tidal flats +
discoid +  and radiate +
disciform +  and discoid +
in 2s +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.65 cm6.5 mm <br />0.0065 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric;usually cylindric;campanulate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
yellow-orange +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and petiolate +
whorled +  and opposite +
deltate +
ciliate +  and barbed +
0.55 cm5.5 mm <br />0.0055 m <br /> (1 cm10 mm <br />0.01 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 /> (3.5 cm35 mm <br />0.035 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering Sep–Oct. +
connate +  and distinct +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
styliferous +  and neuter +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Bidens eatonii var. fallax +, Bidens eatonii var. illicita +, Bidens eatonii var. interstes +, Bidens eatonii var. kennebecensis +, Bidens eatonii var. major +, Bidens eatonii var. mutabilis +  and Bidens eatonii var. simulans +
Bidens eatonii +
species +
toothed +, serrate +, laciniate +  and dentate +
70 cm700 mm <br />0.7 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
25 cm250 mm <br />0.25 m <br /> (70 cm700 mm <br />0.7 m <br />) +
shrub +  and subshrub +