Bidens trichosperma |
Bidens bidentoides |
|
---|---|---|
crowned beggar-ticks, tall swamp marigold |
delmarva beggarticks |
|
Habit | Annuals (biennials), (15–)30–50(–150+) cm. | Annuals, 10–90+ cm. |
Leaves | petioles 5–20+ mm; blades ± deltate to ovate overall, 40–75(–150) × 10–45(–130) mm, usually laciniately 1–2-pinnatisect, ultimate lobes (3–)5–7+, oblanceolate or lanceolate to linear, (5–)10–30(–80+) × (1–)4–8(–12+) mm, bases cuneate, ultimate margins incised, dentate, serrate, or entire, little, if at all, ciliate, apices acute to attenuate, faces glabrous or ± hirtellous to strigillose. |
petioles 10–25 mm; blades lanceolate to lance-linear, 40–160 × 3–30+ mm, bases cuneate, margins entire or laciniate to serrate or denticulate, minutely, if at all, ciliate, apices acuminate to attenuate, faces glabrous. |
Peduncles | 20–150 mm. |
10–30(–60+) mm. |
Involucres | hemispheric or broader, 4–6(–8) × 6–12 mm. |
narrowly campanulate to cylindric, 9–16 × 5–8(–12) mm. |
Ray florets | (7–)8–9; laminae golden yellow, 10–30 mm. |
usually 0, sometimes 3–5+; laminae yellowish, 2–10 mm. |
Disc florets | 40–60(–80+); corollas yellow, 3–5 mm. |
6–20(–30+); corollas yellowish, 3–6 mm. |
Phyllaries | 6–8(–10), oblong, 3–8 mm. |
4–8+, ± oblong, 9–16 mm. |
Calyculi | of (6–)8(–11), ascending to spreading, spatulate to linear, sometimes ± foliaceous bractlets or bracts 3–10(–18) mm, margins sometimes ciliate, abaxial faces glabrous. |
of 3–5 usually spreading, narrowly lanceolate to oblanceolate, sometimes foliaceous bractlets or bracts 10–30(–60) mm, margins entire, usually ciliate, abaxial faces usually glabrous. |
Heads | usually in open, ± corymbiform arrays. |
usually borne singly, sometimes in open, ± corymbiform arrays. |
Cypselae | blackish or brown, flattened, narrowly cuneate, outer 3–6 mm, inner 5–9 mm (lengths mostly 2.5–4 times widths), margins antrorsely barbed or ciliate, apices ± truncate, faces obscurely 1-nerved, sometimes tuberculate, glabrous or sparsely hispidulous; pappi of 2 erect, ± patently barbed awns or scales (0.4–)1–2.5(–4) mm. |
red-brown, flattened, sometimes weakly 4-angled, narrowly cuneate to linear, outer 6–10 mm, inner 8–13 mm, margins evenly antrorsely strigillose, apices truncate, faces smooth or ± striate, ± evenly antrorsely strigillose; pappi of 2(–4) erect to spreading, antrorsely barbed awns (2–)3–9 mm. |
2n | = 24. |
|
Bidens trichosperma |
Bidens bidentoides |
|
Phenology | Flowering Aug–Oct. | Flowering Sep. |
Habitat | Marshes, estuaries | Borders of streams, estuaries |
Elevation | 0–300 m (0–1000 ft) | 0–10+ m (0–0+ ft) |
Distribution |
AL; AR; CT; DE; FL; GA; IA; IL; IN; KY; MA; MD; MI; MN; MO; MS; NC; NE; NJ; NY; OH; PA; RI; SC; SD; TN; VA; WI; WV; ON; QC
|
DE; MD; NJ; NY; PA |
Discussion | Plants here called Bidens trichosperma have long been known as B. coronata (Linnaeus) Britton (or Britton ex Sherff). Alas, Britton’s B. coronata (1913) is a later homonym of B. coronata Fischer ex Colla (1834) and cannot be used. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 213. | FNA vol. 21, p. 216. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | ||
Synonyms | Coreopsis trichosperma, B. coronata var. brachyodonta, B. coronata var. tenuiloba, B. coronata var. trichosperma | Diodonta bidentoides, B. bidentoides var. mariana, B. mariana |
Name authority | (Michaux) Britton: Bull. Torrey Bot. Club 20: 281. (1893) | (Nuttall) Britton: Bull Torrey Bot. Club 20: 281. (1893) |
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