Bidens aristosa |
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bearded beggarticks, long-bract beggar-ticks, midwestern beggar-ticks, tickseed sunflower |
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Habit | Annuals, (15–)30–60(–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. |
Peduncles | (10–)30–80+ mm. |
Involucres | ± hemispheric or broader, 6–8(–12) × 10–15 mm. |
Ray florets | (5–)8–10+; laminae yellow, 10–25 mm. |
Disc florets | (12–)20–40+; corollas yellowish, 2–3+ mm. |
Phyllaries | 7–8(–13), lance-ovate to lance-linear, 6–8(–12) 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. |
Heads | in ± 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. |
Bidens aristosa |
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Phenology | Flowering Aug–Oct(–Nov). |
Habitat | Marshes, meadows, pine forests, disturbed sites |
Elevation | 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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Source | FNA vol. 21, p. 214. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | |
Synonyms | Coreopsis aristosa, B. aristosa var. fritcheyi, B. aristosa var. mutica |
Name authority | (Michaux) Britton: Bull Torrey Bot. Club 20: 281. (1893) |
Web links |