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crowned beggar-ticks, tall swamp marigold

delmarva beggarticks

Habit Annuals (biennials), (15–)30–50(–150+) cm. Annuals, 10–90+ cm.
Leaves

petioles 5–20+ mm;

blades ± deltate to ovate overall, 40–75(–150) × 10–45(–130) mm, usually laciniately 1–2-pinnatisect, ultimate lobes (3–)5–7+, oblanceolate or lanceolate to linear, (5–)10–30(–80+) × (1–)4–8(–12+) mm, bases cuneate, ultimate margins incised, dentate, serrate, or entire, little, if at all, ciliate, apices acute to attenuate, faces glabrous or ± hirtellous to strigillose.

petioles 10–25 mm;

blades lanceolate to lance-linear, 40–160 × 3–30+ mm, bases cuneate, margins entire or laciniate to serrate or denticulate, minutely, if at all, ciliate, apices acuminate to attenuate, faces glabrous.

Peduncles

20–150 mm.

10–30(–60+) mm.

Involucres

hemispheric or broader, 4–6(–8) × 6–12 mm.

narrowly campanulate to cylindric, 9–16 × 5–8(–12) mm.

Ray florets

(7–)8–9;

laminae golden yellow, 10–30 mm.

usually 0, sometimes 3–5+;

laminae yellowish, 2–10 mm.

Disc florets

40–60(–80+);

corollas yellow, 3–5 mm.

6–20(–30+);

corollas yellowish, 3–6 mm.

Phyllaries

6–8(–10), oblong, 3–8 mm.

4–8+, ± oblong, 9–16 mm.

Calyculi

of (6–)8(–11), ascending to spreading, spatulate to linear, sometimes ± foliaceous bractlets or bracts 3–10(–18) mm, margins sometimes ciliate, abaxial faces glabrous.

of 3–5 usually spreading, narrowly lanceolate to oblanceolate, sometimes foliaceous bractlets or bracts 10–30(–60) mm, margins entire, usually ciliate, abaxial faces usually glabrous.

Heads

usually in open, ± corymbiform arrays.

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

Cypselae

blackish or brown, flattened, narrowly cuneate, outer 3–6 mm, inner 5–9 mm (lengths mostly 2.5–4 times widths), margins antrorsely barbed or ciliate, apices ± truncate, faces obscurely 1-nerved, sometimes tuberculate, glabrous or sparsely hispidulous;

pappi of 2 erect, ± patently barbed awns or scales (0.4–)1–2.5(–4) mm.

red-brown, flattened, sometimes weakly 4-angled, narrowly cuneate to linear, outer 6–10 mm, inner 8–13 mm, margins evenly antrorsely strigillose, apices truncate, faces smooth or ± striate, ± evenly antrorsely strigillose;

pappi of 2(–4) erect to spreading, antrorsely barbed awns (2–)3–9 mm.

2n

= 24.

Bidens trichosperma

Bidens bidentoides

Phenology Flowering Aug–Oct. Flowering Sep.
Habitat Marshes, estuaries Borders of streams, estuaries
Elevation 0–300 m (0–1000 ft) 0–10+ m (0–0+ ft)
Distribution
from FNA
AL; AR; CT; DE; FL; GA; IA; IL; IN; KY; MA; MD; MI; MN; MO; MS; NC; NE; NJ; NY; OH; PA; RI; SC; SD; TN; VA; WI; WV; ON; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
DE; MD; NJ; NY; PA
[BONAP county map]
Discussion

Plants here called Bidens trichosperma have long been known as B. coronata (Linnaeus) Britton (or Britton ex Sherff). Alas, Britton’s B. coronata (1913) is a later homonym of B. coronata Fischer ex Colla (1834) and cannot be used.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 213. FNA vol. 21, p. 216.
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. pilosa, B. polylepis, B. tenuisecta, B. tripartita, B. vulgata
B. amplissima, B. aristosa, B. aurea, B. beckii, 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. pilosa, B. polylepis, B. tenuisecta, B. trichosperma, B. tripartita, B. vulgata
Synonyms Coreopsis trichosperma, B. coronata var. brachyodonta, B. coronata var. tenuiloba, B. coronata var. trichosperma Diodonta bidentoides, B. bidentoides var. mariana, B. mariana
Name authority (Michaux) Britton: Bull. Torrey Bot. Club 20: 281. (1893) (Nuttall) Britton: Bull Torrey Bot. Club 20: 281. (1893)
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