Bidens eatonii


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

Common names: Bident d’Eaton
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 lance-ovate 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 lance-ovate, 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



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


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

Selected References


Lower Taxa

... more about "Bidens eatonii"
John L. Strother +  and Ronald R. Weedon +
Fernald +
Bident d’Eaton +
N.B. +, P.E.I. +, Que. +, Conn. +, Maine +, Mass. +, N.J. +, N.Y. +  and R.I. +
0–10 m +
Borders of estuaries, marshes, tidal flats +
Flowering Sep–Oct. +
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 +