Bidens tripartita |
Bidens tenuisecta |
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bident à trois divisions, three-lobed beggar-ticks, three-lobed beggars-ticks, three-part beggarticks, threelobe beggarticks, tickseed |
slim-lobe beggarticks, slim-lobed beggar-ticks |
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Habit | Annuals, (5–)20–70(–200) cm. | Annuals, (10–)20–40 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; blades rounded-deltate to ovate overall, 20–50+ × 15–35+ mm, (1–)2–3-pinnatisect, ultimate lobes ± linear, (2–)5–15+ × (0.5–)2–3+ mm, bases ± cuneate, ultimate margins entire, sometimes ciliolate, apices acute to attenuate, faces usually glabrous, sometimes hispidulous. |
Peduncles | 10–40(–80) mm. |
20–30(–80) mm. |
Involucres | campanulate to hemispheric or broader, (4–)5–7(–12) × (3–)6–12(–15+) mm. |
campanulate to hemispheric or broader, (5–)6–7 × 4–8 mm. |
Ray florets | usually 0, sometimes 1–5; laminae orange yellowish, 4–8 mm. |
0 or 3–6; laminae yellow, 4–6 mm. |
Disc florets | (5–)20–60(–150+); corollas pale yellow to orange, (2–)3–4 mm (gradually ampliate, anthers usually pale). |
(5–)12–20(–45); corollas yellow, 2–3 mm. |
Phyllaries | (6–)7–8(–13), elliptic-ovate to lance-ovate, (4–)6–9(–12) mm. |
8, lance-linear, 5–7 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 6–12 ± appressed, linear bractlets 5–7 mm, margins scabro-ciliate, abaxial faces usually pilosulous to hirsutulous, rarely glabrous. |
Heads | borne singly or in 2s or 3s. |
usually borne singly, sometimes in 2s or 3s. |
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 weakly 4-angled, linear, 6–8 mm, margins not ciliate, apices somewhat attenuate, faces obscurely 2-grooved, often tuberculate, glabrous or ± strigillose; inner similar, blackish (sometimes with pale tips), ± equally 4-angled, linear-fusiform, 8–15 mm, margins not ciliate, apices attenuate, faces 2-grooved, glabrous or, toward tips, strigillose; pappi of 2(–3), spreading to divergent, retrorsely barbed awns (1–)1.5–3 mm. |
2n | = 48. |
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Bidens tripartita |
Bidens tenuisecta |
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Phenology | Flowering Aug–Oct. | Flowering (Jul–)Aug–Sep(–Oct). |
Habitat | Marshes and other wet sites | Meadows, along streams |
Elevation | 10–1700 m (0–5600 ft) | 1800–2600 m (5900–8500 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; CO; ID; NM; UT; Mexico (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.) |
Reports of Bidens tenuisecta from Maryland, Massachusetts, and New York may be based on ephemeral introductions. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 217. | FNA vol. 21, p. 210. |
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) | A. Gray: Mem. Amer. Acad. Arts, n. s. 4: 86. (1849) |
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