Bidens tripartita |
Bidens leptocephala |
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bident à trois divisions, three-lobed beggar-ticks, three-lobed beggars-ticks, three-part beggarticks, threelobe beggarticks, tickseed |
few-flower beggarticks |
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Habit | Annuals, (5–)20–70(–200) cm. | Annuals, 10–25(–50) cm. |
Leaves | sessile or petioles 5–15(–35+) mm (± winged); blades ± elliptic to ovate or lanceolate, 40–80(–150+) × 15–40(–60+) mm, sometimes laciniately 1-pinnatisect with 1–4+ lobes near bases, bases cuneate, margins entire or dentate to serrate, usually ciliate, apices acute to acuminate, faces glabrous or hirtellous. |
petioles 5–40 mm (usually hispido-ciliate); blades rounded-deltate overall, 15–50+ × 12–40+ mm, 1–2-pinnatisect, ultimate lobes ovate or lanceolate to linear, 3–25+ × (1–)2–3(–15) mm, bases ± cuneate, ultimate margins entire, ciliolate, apices acute to attenuate, faces glabrous or hirtellous. |
Peduncles | 10–40(–80) mm. |
(10–)30–80+ mm. |
Involucres | campanulate to hemispheric or broader, (4–)5–7(–12) × (3–)6–12(–15+) mm. |
± cylindric, 2–3(–4+) × 1.5–2+ mm. |
Ray florets | usually 0, sometimes 1–5; laminae orange yellowish, 4–8 mm. |
0 or 2–3; laminae yellowish or whitish, 1–3 mm. |
Disc florets | (5–)20–60(–150+); corollas pale yellow to orange, (2–)3–4 mm (gradually ampliate, anthers usually pale). |
5–13; corollas yellowish to whitish, 1.5–2 mm. |
Phyllaries | (6–)7–8(–13), elliptic-ovate to lance-ovate, (4–)6–9(–12) mm. |
4–5(–7), oblong to lanceolate, (2–)3–4+ mm. |
Calyculi | of (2–)6–7(–10) ± spreading, oblanceolate or lanceolate to linear, ± foliaceous bractlets or bracts 7–35(–60) mm, margins (entire or serrate) sometimes sparsely ciliate, abaxial faces hispidulous near bases, distally glabrous. |
of 3–4(–6) ± appressed, subulate to filiform bractlets 1–3 mm, margins ciliolate, abaxial faces usually glabrous. |
Heads | borne singly or in 2s or 3s. |
usually borne singly, sometimes in open, ± corymbiform arrays. |
Cypselae | blackish to purplish or brown, ± flattened, sometimes weakly 3(–4)-angled, usually cuneate to linear, outer (3–)6–7(–10) mm, inner (4–)6–9(–11) mm, margins proximally antrorsely to patently, distally retrorsely, barbed, apices ± truncate to concave, faces ± 1-nerved, usually smooth, seldom notably tuberculate, glabrous or sparsely strigillose; pappi 0, or of (1–)3–3(–4+) ± erect to spreading, retrorsely barbed awns (0.2–)2–3(–6) mm. |
outer red-brown, flat or unequally 4-angled, linear, 6–8 mm, margins not ciliate, apices somewhat attenuate, faces obscurely 2-grooved, antrorsely hispidulous toward tips; inner similar, blackish (sometimes with pale tips), ± equally 4-angled, linear-fusiform, 9–14 mm, margins not ciliate, apices attenuate, faces 2-grooved, antrorsely hispidulous (at least distally); pappi of 2(–3), erect, retrorsely barbed awns 1–3 mm. |
2n | = 48. |
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Bidens tripartita |
Bidens leptocephala |
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Phenology | Flowering Aug–Oct. | Flowering Sep. |
Habitat | Marshes and other wet sites | Along streams |
Elevation | 10–1700 m (0–5600 ft) | 900–1800 m (3000–5900 ft) |
Distribution |
AK; AL; CA; CO; CT; DC; DE; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; QC; Europe; Asia; n Africa [Introduced in Pacific Islands, Australia]
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AZ; NM; TX; Mexico (Baja California, Chihuahua)
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Discussion | Plants with cypsela mid-nerves strongly developed (cypselae more or less strongly 4-angled and, often, tuberculate) that are treated below as Bidens connata have been included in B. tripartita, perhaps rightly so. And some botanists have included (or advocated inclusion of) B. eatonii, B. heterodoxa, and/or B. infirma in B. tripartita, as well, perhaps rightly so. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 21, p. 217. | FNA vol. 21, p. 209. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | ||
Synonyms | B. comosa | |
Name authority | Linnaeus: Sp. Pl. 2: 831. (1753) | Sherff: Bot. Gaz. 64: 22. (1917) |
Web links |
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