Bidens aristosa |
Bidens trichosperma |
|
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bearded beggarticks, long-bract beggar-ticks, midwestern beggar-ticks, tickseed sunflower |
crowned beggar-ticks, tall swamp marigold |
|
Habit | Annuals, (15–)30–60(–150) cm. | Annuals (biennials), (15–)30–50(–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. |
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. |
Peduncles | (10–)30–80+ mm. |
20–150 mm. |
Involucres | ± hemispheric or broader, 6–8(–12) × 10–15 mm. |
hemispheric or broader, 4–6(–8) × 6–12 mm. |
Ray florets | (5–)8–10+; laminae yellow, 10–25 mm. |
(7–)8–9; laminae golden yellow, 10–30 mm. |
Disc florets | (12–)20–40+; corollas yellowish, 2–3+ mm. |
40–60(–80+); corollas yellow, 3–5 mm. |
Phyllaries | 7–8(–13), lance-ovate to lance-linear, 6–8(–12) mm. |
6–8(–10), oblong, 3–8 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. |
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. |
Heads | in ± corymbiform arrays. |
usually in open, ± corymbiform arrays. |
Cypselae | red-brown 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. |
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. |
2n | = 24. |
|
Bidens aristosa |
Bidens trichosperma |
|
Phenology | Flowering Aug–Oct(–Nov). | Flowering Aug–Oct. |
Habitat | Marshes, meadows, pine forests, disturbed sites | Marshes, estuaries |
Elevation | 0–300 m (0–1000 ft) | 0–300 m (0–1000 ft) |
Distribution |
AL; AR; DC; IL; IN; KY; LA; MD; MI; MN; MO; NC; SC; TN; TX; VA; ON
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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
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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. 214. | FNA vol. 21, p. 213. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | ||
Synonyms | Coreopsis aristosa, B. aristosa var. fritcheyi, B. aristosa var. mutica | Coreopsis trichosperma, B. coronata var. brachyodonta, B. coronata var. tenuiloba, B. coronata var. trichosperma |
Name authority | (Michaux) Britton: Bull Torrey Bot. Club 20: 281. (1893) | (Michaux) Britton: Bull. Torrey Bot. Club 20: 281. (1893) |
Web links |