Bidens pilosa
Bidens heterosperma
bident poilu, cobbler's pegs, common beggar-ticks, hairy beggar-ticks, Spanish needle
Rocky Mountain beggarticks
petioles 10–30(–70) mm;
blades either ovate to lanceolate, 30–70(–120) × 12–18(–45) mm, or 1-pinnately lobed, primary lobes 3–7, ovate to lanceolate [linear], (10–)25–80+ × (5–)10–40+ mm [blades 2(–3)-pinnatisect], bases truncate to cuneate, ultimate margins serrate or entire, usually ciliate, apices acute to attenuate, faces pilosulous to sparsely hirtellous or glabrate.
petioles 3–20 mm;
blades usually rounded-deltate overall, 10–30+ × 5–20+ mm, 1–2-pinnatisect, ultimate lobes linear to filiform, 2–25 × 0.5–1(–2) mm, bases obscurely cuneate, ultimate margins minutely, if at all, ciliate, apices obtuse to acute (sometimes apiculate), faces glabrous or sparsely hirtellous.
10–20(–90) mm.
10–50(–100) mm.
turbinate to campanulate, 5–6 × (6–)7–8 mm.
± cylindric, 3.5–5 × (1–)2–3 mm.
0 or (3–)5–8+;
laminae whitish to pinkish [yellowish], 2–3 or 7–15+ mm.
0 or 1–3+;
laminae yellowish, 1–4 mm.
20–40(–80+);
corollas yellowish, (2–)3–5 mm.
5–9(–13);
corollas yellowish, 1–1.5 mm.
(7–)8–9(–13), lanceolate to oblanceolate, 4–6 mm.
5–6, lance-elliptic to lanceolate, 2.5–4(–5) mm.
(6–)7–9(–13) ± appressed, spatulate to linear bractlets (3–)4–5 mm, margins ciliate, abaxial faces usually hispidulous to puberulent.
of (1–)3(–5), appressed to spreading, linear bractlets (1–)3(–4) mm, margins minutely, if at all, ciliate, abaxial faces usually glabrous, sometimes sparsely hispidulous.
usually borne singly, sometimes in open, ± corymbiform arrays.
usually borne singly.
outer red-brown, ± flat, linear to narrowly cuneate, (3–)4–5+ mm, margins antrorsely hispidulous, apices ± truncate or somewhat attenuate, faces obscurely 2-grooved, sometimes tuberculate-hispidulous;
inner blackish, ± equally 4-angled, linear-fusiform, 7–16 mm, margins antrorsely hispidulous, apices ± attenuate, faces 2-grooved, tuberculate-hispidulous to sparsely strigillose;
pappi 0, or of 2–3(–5), erect to divergent, retrorsely barbed awns (0.5–)2–4 mm.
red-brown to blackish (sometimes with lighter blotches), outer ± obcompressed and linear, 3–5 mm, margins not ciliate, apices ± truncate, faces 2-grooved, usually glabrous;
inner similar, ± equally 4-angled, linear-fusiform, (6–)7–12 mm, apices ± attenuate;
pappi 0, or of 2(–3) spreading to divergent, retrorsely barbed awns 1–2 mm.
= 24, 36, 48, 72.
Bidens pilosa
Bidens heterosperma
R. Ballard (1986) adopted a narrower circumscription of Bidens pilosa than that used here. He used: B. pilosa for plants with outer phyllaries 7–10, ray florets usually 0 (when present, laminae 2–3 mm), disc florets 35–75, pappi of 3(–5) awns 1–3 mm, and 2n = 72; B. alba for plants with outer phyllaries (8–)12(–16), ray florets 5–8 (laminae 5–16 mm), pappi of 2 awns 1–2 mm, and 2n = 48; and B. odorata for plants with outer phyllaries (6–)8(–12), ray florets 5–8 (laminae 3–18 mm), disc florets 12–61, pappi 0, or of 1–2 awns 1–3 mm, and 2n = 24.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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