Bidens tenuisecta
Bidens amplissima
slim-lobe beggarticks, slim-lobed beggar-ticks
Vancouver Island beggar-ticks
petioles 5–40 mm;
blades rounded-deltate to ovate overall, 20–50+ × 15–35+ mm, (1–)2–3-pinnatisect, ultimate lobes ± linear, (2–)5–15+ × (0.5–)2–3+ mm, bases ± cuneate, ultimate margins entire, sometimes ciliolate, apices acute to attenuate, faces usually glabrous, sometimes hispidulous.
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.
20–30(–80) mm.
(10–)30–70+ mm.
campanulate to hemispheric or broader, (5–)6–7 × 4–8 mm.
± hemispheric or broader, 6–10 × 18–25 mm.
0 or 3–6;
laminae yellow, 4–6 mm.
6–11;
laminae yellow, 4–8 mm.
(5–)12–20(–45);
corollas yellow, 2–3 mm.
50–100+;
corollas yellow, 2.5–3.5 mm.
8, lance-linear, 5–7 mm.
13–16+, oblong to lance-ovate, 6–10 mm.
of 6–12 ± appressed, linear bractlets 5–7 mm, margins scabro-ciliate, abaxial faces usually pilosulous to hirsutulous, rarely 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.
usually borne singly, sometimes in 2s or 3s.
in ± corymbiform arrays.
outer red-brown, flat or weakly 4-angled, linear, 6–8 mm, margins not ciliate, apices somewhat attenuate, faces obscurely 2-grooved, often tuberculate, glabrous or ± strigillose;
inner similar, blackish (sometimes with pale tips), ± equally 4-angled, linear-fusiform, 8–15 mm, margins not ciliate, apices attenuate, faces 2-grooved, glabrous or, toward tips, strigillose;
pappi of 2(–3), spreading to divergent, retrorsely barbed awns (1–)1.5–3 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.
Bidens tenuisecta
Bidens amplissima
Reports of Bidens tenuisecta from Maryland, Massachusetts, and New York may be based on ephemeral introductions.
(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.)
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
BC
WA
Flora NW
