(redirected from: Bidens eatonii var. simulans Fassett)
Family: Asteraceae
Eaton's beggarticks
[Bidens eatonii var. fallax Fern., moreBidens eatonii var. illicita S.F.Blake, Bidens eatonii var. interstes Fassett, Bidens eatonii var. kennebecensis Fern., Bidens eatonii var. major Fassett, Bidens eatonii var. mutabilis Fassett, Bidens eatonii var. simulans Fassett]
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. Flowering Sep-Oct. Borders of estuaries, marshes, tidal flats; 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.
Glabrous annual 2-7 dm; lvs lanceolate, long-acuminate, serrate, often with 1 or 2 prominent lateral lobes, the blade 4-12 cm נ7-20 mm, attenuate into a slender or wing-margined petiole 1-3.5 cm; heads erect, discoid or shortly radiate, subcylindric to narrowly campanulate, the disk 5-12 mm wide, the fls 7-30; outer invol bracts mostly 3-5, foliaceous, narrow, erect and surpassing the disk; achenes flat or compressed-quadrangular, ±striate and with a strong median rib on each face, smooth except for a few scattered appressed hairs, 6-11 נ1-2 mm; pappus of 2-4 retrorsely or antrorsely barbed awns, mostly less than half as long as the achene, sometimes much reduced; 2n=48. Estuaries; Que. to N.Y. Aug., Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.