Bidens laevis
Bidens amplissima
bur-marigold, smooth beggar-ticks, smooth beggartick
Vancouver Island beggar-ticks
(sometimes in 3s or 4s) sessile;
blades obovate or elliptic to lanceolate or linear, (20–)50–100(–160+) × (5–)10–25(–40+) mm, bases cuneate to rounded, margins usually coarsely dentate to serrate, sometimes ciliate, apices acute to acuminate, faces glabrous.
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–)20–60 mm.
(10–)30–70+ mm.
turbinate to hemispheric or broader, (4–)6–8(–10+) × 8–12+ mm.
± hemispheric or broader, 6–10 × 18–25 mm.
usually 7–8, rarely 0;
laminae orange-yellow, (10–)15–25(–30) mm.
6–11;
laminae yellow, 4–8 mm.
(25–)60–100(–150+);
corollas yellow to orange-yellow, 3–6.5 mm.
50–100+;
corollas yellow, 2.5–3.5 mm.
8–12, ovate or obovate to lance-oblong, (4–)6–8(–10+) mm (tips often orange to purplish, as are tips of paleae).
13–16+, oblong to lance-ovate, 6–10 mm.
of 5–7(–9+) erect or spreading to reflexed, oblanceolate or lanceolate to linear, often foliaceous bractlets or bracts (6–)10–12(–20+) mm, margins usually ciliate, abaxial faces glabrous or bases hispidulous.
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.
(erect at flowering, sometimes nodding in fruit) borne singly or in open, ± corymbiform arrays.
in ± corymbiform arrays.
blackish, red-brown, or stramineous, obcompressed, flattened or unequally 3–4-angled, ± cuneate, outer 6–8 mm, inner 8–10 mm, margins retrorsely ciliate or barbed, apices ± truncate to convex, faces ± 1-nerved, ± striate, glabrous;
pappi of 2–4 ± erect, retrorsely barbed awns 3–5 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.
= 22, 24.
Bidens laevis
Bidens amplissima
Bidens laevis and B. cernua are similar in gross appearance; specimens of one are sometimes misidentified as the other. Perhaps they represent extremes of a single species.
(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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