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bident poilu, cobbler's pegs, common beggar-ticks, hairy beggar-ticks, Spanish needle

Lemmon's beggarticks

Habit Annuals [perennials], (10–)30–60(–180+)[–250] cm. Annuals, (10–)15–25(–30+) cm.
Leaves

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 10–20 mm;

blades either oblanceolate to linear, 5–15+ × 1–2+ mm, or rounded-deltate overall, 10–25(–60+) × 15–25+ mm, (1–)2–3-pinnatisect, ultimate lobes oblanceolate to spatulate or linear, 5–15+ × 0.5–5 mm, bases ± cuneate, ultimate margins entire, sometimes ciliolate, apices obtuse to acute, faces glabrous.

Peduncles

10–20(–90) mm.

10–20(–90) mm.

Involucres

turbinate to campanulate, 5–6 × (6–)7–8 mm.

± campanulate to cylindric, 2–3(–8) × 2(–3)[–4] mm.

Ray florets

0 or (3–)5–8+;

laminae whitish to pinkish [yellowish], 2–3 or 7–15+ mm.

0 or 1(–3+);

laminae whitish, 1–1.5(–3+) mm.

Disc florets

20–40(–80+);

corollas yellowish, (2–)3–5 mm.

(3–)5–9;

corollas whitish to yellowish, 2–2.5 mm.

Phyllaries

(7–)8–9(–13), lanceolate to oblanceolate, 4–6 mm.

(3–)5, oblong to lanceolate orlinear, (2–)3–8 mm.

Calyculi

(6–)7–9(–13) ± appressed, spatulate to linear bractlets (3–)4–5 mm, margins ciliate, abaxial faces usually hispidulous to puberulent.

of (1–)3–4 appressed to spreading, spatulate to linear bractlets or bracts 3–10(–25+) mm (sometimes foliaceous: pinnate, lobes 3–5+, linear), margins ciliolate, abaxial faces usually glabrous, sometimes sparsely hispidulous.

Heads

usually borne singly, sometimes in open, ± corymbiform arrays.

usually borne singly, sometimes in open, ± corymbiform arrays.

Cypselae

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.

outer red-brown (sometimes with lighter blotches), ± equally 4-angled, linear-fusiform, 5–6(–8) mm, margins not ciliate, apices ± attenuate, faces 2-grooved, usually glabrous;

inner similar, 10–14 mm;

pappi of 2–3 erect, retrorsely barbed awns 1–2(–3) mm.

2n

= 24, 36, 48, 72.

Bidens pilosa

Bidens lemmonii

Phenology Flowering year round. Flowering Sep–Oct.
Habitat Disturbed, wettish sites Wettish spots on rocky slopes
Elevation 10–1900 m (0–6200 ft) 1400–2100 m (4600–6900 ft)
Distribution
from FNA
AL; AZ; CA; CT; FL; GA; KY; LA; MA; MD; MO; MS; NC; NM; PA; SC; TX; ON; QC; Mexico; Central America [Introduced, Europe]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; Mexico
[BONAP county map]
Discussion

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.)

Source FNA vol. 21, p. 211. FNA vol. 21, p. 209.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens Asteraceae > tribe Heliantheae > subtribe Coreopsidinae > Bidens
Sibling taxa
B. amplissima, B. aristosa, B. aurea, B. beckii, B. bidentoides, B. bigelovii, B. bipinnata, B. cernua, B. connata, B. discoidea, B. eatonii, B. frondosa, B. heterodoxa, B. heterosperma, B. hyperborea, B. laevis, B. lemmonii, B. leptocephala, B. mitis, B. polylepis, B. tenuisecta, B. trichosperma, B. tripartita, B. vulgata
B. amplissima, B. aristosa, B. aurea, B. beckii, B. bidentoides, B. bigelovii, B. bipinnata, B. cernua, B. connata, B. discoidea, B. eatonii, B. frondosa, B. heterodoxa, B. heterosperma, B. hyperborea, B. laevis, B. leptocephala, B. mitis, B. pilosa, B. polylepis, B. tenuisecta, B. trichosperma, B. tripartita, B. vulgata
Synonyms B. alba, B. alba var. radiata, B. odorata, B. pilosa var. radiata
Name authority Linnaeus: Sp. Pl. 2: 832. (1753) A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 1(2): 297. (1884)
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