Bidens tripartita |
Bidens hyperborea |
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bident à trois divisions, three-lobed beggar-ticks, three-lobed beggars-ticks, three-part beggarticks, threelobe beggarticks, tickseed |
bident hyperboréal, estuary beggarticks, northern beggar-ticks |
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Habit | Annuals, (5–)20–70(–200) cm. | Annuals, (5–)10–30(–70+) 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. |
sessile or petioles 5–25 mm (± winged); blades oblanceolate to linear, 15–40(–100+) × (3–)6–10(–15+) mm, bases cuneate, margins entire or ± serrate, sometimes ciliate, apices rounded or obtuse to attenuate, faces glabrous. |
Peduncles | 10–40(–80) mm. |
10–60 mm. |
Involucres | campanulate to hemispheric or broader, (4–)5–7(–12) × (3–)6–12(–15+) mm. |
usually ± campanulate to cylindric, sometimes ± hemispheric, 5–7(–9) × (4–)7–10 mm. |
Ray florets | usually 0, sometimes 1–5; laminae orange yellowish, 4–8 mm. |
0 or 3–7; laminae pale yellow, 4–12 mm. |
Disc florets | (5–)20–60(–150+); corollas pale yellow to orange, (2–)3–4 mm (gradually ampliate, anthers usually pale). |
15–30(–60); corollas yellow (often orange-tipped), 3–4 mm. |
Phyllaries | (6–)7–8(–13), elliptic-ovate to lance-ovate, (4–)6–9(–12) mm. |
6–8(–12), oblong, 6–11 mm (tips usually yellow, as are tips of paleae). |
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 2–3(–9) erect, oblanceolate to lance-linear (± foliaceous) bractlets or bracts (6–)10–20(–75+) mm, margins usually ciliolate, abaxial faces glabrous. |
Heads | borne singly or in 2s or 3s. |
borne singly or 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. |
blackish to olive, flattened, narrowly cuneate, outer 4–9 mm, inner 5–10 mm, margins retrorsely barbed, apices ± truncate to convex, faces ± 1-nerved, ± striate, glabrous; pappi of (2–)3–4 ± erect, retrorsely barbed awns 2–5 mm. |
2n | = 48. |
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Bidens tripartita |
Bidens hyperborea |
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Phenology | Flowering Aug–Oct. | Flowering Aug–Oct. |
Habitat | Marshes and other wet sites | Marshes, borders of estuaries |
Elevation | 10–1700 m (0–5600 ft) | 0–10 m (0–0 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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MA; ME; NH; NY; NB; NS; NU; ON; QC
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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. 216. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens | Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens |
Sibling taxa | ||
Synonyms | B. comosa | B. hyperborea var. arcuans, B. hyperborea var. cathancensis, B. hyperborea var. colpophila, B. hyperborea var. gaspensis, B. hyperborea var. svensonii |
Name authority | Linnaeus: Sp. Pl. 2: 831. (1753) | Greene: Pittonia 4: 257. (1901) |
Web links |
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