Bidens tripartita
Bidens amplissima
bident à trois divisions, three-lobed beggar-ticks, three-lobed beggars-ticks, three-part beggarticks, threelobe beggarticks, tickseed
Vancouver Island beggar-ticks
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 10–50 mm (winged);
blades lance-elliptic to lance-oblong, 80–120(–250) × 30–100 mm (proximal usually with 1–2 lobes near bases), bases cuneate, margins laciniate to serrate, ciliate, apices acuminate, faces glabrous.
10–40(–80) mm.
(10–)30–70+ mm.
campanulate to hemispheric or broader, (4–)5–7(–12) × (3–)6–12(–15+) mm.
± hemispheric or broader, 6–10 × 18–25 mm.
usually 0, sometimes 1–5;
laminae orange yellowish, 4–8 mm.
6–11;
laminae yellow, 4–8 mm.
(5–)20–60(–150+);
corollas pale yellow to orange, (2–)3–4 mm (gradually ampliate, anthers usually pale).
50–100+;
corollas yellow, 2.5–3.5 mm.
(6–)7–8(–13), elliptic-ovate to lance-ovate, (4–)6–9(–12) mm.
13–16+, oblong to lance-ovate, 6–10 mm.
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 8–10 usually spreading, lance-linear to lanceolate, sometimes ± foliaceous bractlets or bracts 10–20(–75) mm, margins entire or incised, ciliate, abaxial faces ± hispid at bases.
borne singly or in 2s or 3s.
in ± corymbiform arrays.
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.
olivaceous green, ± flattened, unequally 3–4-angled, cuneate, outer 5–6 mm, inner 6–7 mm, margins antrorsely to retrorsely barbed, apices truncate to concave, faces weakly striate, glabrous or sparsely puberulent;
pappi 0, or of (1–)3(–4) suberect, retrorsely barbed awns 2–4 mm.
= 48.
Bidens tripartita
Bidens amplissima
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.)
Of conservation concern.
For decades, Bidens amplissima was known only from Vancouver Island; it is now known from southwestern British Columbia and northwestern Washington (F. R. Ganders et al. 2003). Occurrences in southern Manitoba and northwestern Nebraska may represent ephemeral introductions. The restricted natural range of B. amplissima has stimulated interest in it, the addition of it to rare plant lists, and the consideration of need for protected sites where it grows.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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