Bidens aristosa |
Bidens mitis |
|
---|---|---|
bearded beggarticks, long-bract beggar-ticks, midwestern beggar-ticks, tickseed sunflower |
smallfruit beggarticks |
|
Habit | Annuals, (15–)30–60(–150) cm. | Annuals (sometimes persisting), (10–)30–100+ 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(–30+) mm; blades ± deltate to ovate or lanceolate overall, 30–100 × 10–50+ mm, usually laciniately 1-pinnatisect, ultimate lobes 3(–7), ovate or lanceolate to linear, (5–)25–60(–70+) × (1–)5–10(–12+) mm, bases cuneate, ultimate margins serrate or entire, often ciliolate, apices acute to attenuate, faces glabrous or hirtellous. |
Peduncles | (10–)30–80+ mm. |
20–120 mm. |
Involucres | ± hemispheric or broader, 6–8(–12) × 10–15 mm. |
hemispheric or broader, 5–6 × 5–8 mm. |
Ray florets | (5–)8–10+; laminae yellow, 10–25 mm. |
8–13; laminae golden yellow, 12–25+ mm. |
Disc florets | (12–)20–40+; corollas yellowish, 2–3+ mm. |
25–50+; corollas yellowish, 2.5–3 mm. |
Phyllaries | 7–8(–13), lance-ovate to lance-linear, 6–8(–12) mm. |
(6–)8+, lance-ovate to lanceolate, 4–5 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 7–10 spreading, spatulate to linear, seldom foliaceous (± fleshy) bractlets 5–10 mm, margins usually ciliate, abaxial faces glabrous or hirtellous. |
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 or unequally (3–)4-angled, broadly cuneate, outer 2.5–4, inner 3.5–5 mm (lengths mostly 1.5–2.5 times widths), margins not barbed or ciliate, apices ± truncate, faces sometimes obscurely 1-nerved, sometimes tuberculate, glabrous or hirtellous; pappi 0, or of 2 erect, antrorsely barbed awns or ± deltate scales 0.5(–1) mm. |
2n | = 24. |
|
Bidens aristosa |
Bidens mitis |
|
Phenology | Flowering Aug–Oct(–Nov). | Flowering Sep–Nov. |
Habitat | Marshes, meadows, pine forests, disturbed sites | Marshes, borders of estuaries |
Elevation | 0–300 m (0–1000 ft) | 0–100(–300) m (0–300(–1000) ft) |
Distribution |
AL; AR; DC; IL; IN; KY; LA; MD; MI; MN; MO; NC; SC; TN; TX; VA; ON
|
AL; AR; DE; FL; GA; LA; MD; MO; MS; NC; NJ; SC; TN; TX; VA
|
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 mitis |
Name authority | (Michaux) Britton: Bull Torrey Bot. Club 20: 281. (1893) | (Michaux) Sherff: Bot. Gaz. 81: 43. (1926) |
Web links |