Bidens tripartita |
Bidens mitis |
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bident à trois divisions, three-lobed beggar-ticks, three-lobed beggars-ticks, three-part beggarticks, threelobe beggarticks, tickseed |
smallfruit beggarticks |
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Habit | Annuals, (5–)20–70(–200) cm. | Annuals (sometimes persisting), (10–)30–100+ 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 5–20(–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 | 10–40(–80) mm. |
20–120 mm. |
Involucres | campanulate to hemispheric or broader, (4–)5–7(–12) × (3–)6–12(–15+) mm. |
hemispheric or broader, 5–6 × 5–8 mm. |
Ray florets | usually 0, sometimes 1–5; laminae orange yellowish, 4–8 mm. |
8–13; laminae golden yellow, 12–25+ mm. |
Disc florets | (5–)20–60(–150+); corollas pale yellow to orange, (2–)3–4 mm (gradually ampliate, anthers usually pale). |
25–50+; corollas yellowish, 2.5–3 mm. |
Phyllaries | (6–)7–8(–13), elliptic-ovate to lance-ovate, (4–)6–9(–12) mm. |
(6–)8+, lance-ovate to lanceolate, 4–5 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 7–10 spreading, spatulate to linear, seldom foliaceous (± fleshy) bractlets 5–10 mm, margins usually ciliate, abaxial faces glabrous or hirtellous. |
Heads | borne singly or in 2s or 3s. |
usually 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. |
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 | = 48. |
= 24. |
Bidens tripartita |
Bidens mitis |
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Phenology | Flowering Aug–Oct. | Flowering Sep–Nov. |
Habitat | Marshes and other wet sites | Marshes, borders of estuaries |
Elevation | 10–1700 m (0–5600 ft) | 0–100(–300) m (0–300(–1000) 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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AL; AR; DE; FL; GA; LA; MD; MO; MS; NC; NJ; SC; TN; TX; VA
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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. 213. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | ||
Synonyms | B. comosa | Coreopsis mitis |
Name authority | Linnaeus: Sp. Pl. 2: 831. (1753) | (Michaux) Sherff: Bot. Gaz. 81: 43. (1926) |
Web links |
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