Bidens mitis

Annuals (sometimes persisting), (10–) 30–100+ cm. Leaves: petioles 5–20 (–30+) mm; blades ± deltate to ovate or lanceolate overall, 30–100 × 10–50+ mm, usually laciniately 1-pinnatisect, ultimate lobes 3 (–7), ovate or lanceolate to linear, (5–) 25–60 (–70+) × (1–) 5–10 (–12+) mm, bases cuneate, ultimate margins serrate or entire, often ciliolate, apices acute to attenuate, faces glabrous or hirtellous. Heads usually in open, ± corymbiform arrays. Peduncles 20–120 mm. Calyculi of 7–10 spreading, spatulate to linear, seldom foliaceous (± fleshy) bractlets 5–10 mm, margins usually ciliate, abaxial faces glabrous or hirtellous. Involucres hemispheric or broader, 5–6 × 5–8 mm. Phyllaries (6–) 8+, lanceovate to lanceolate, 4–5 mm. Ray-florets 8–13; laminae golden yellow, 12–25+ mm. Disc-florets 25–50+; corollas yellowish, 2.5–3 mm. Cypselae blackish or brown, flattened or unequally (3–) 4-angled, broadly cuneate, outer 2.5–4, inner 3.5–5 mm (lengths mostly 1.5–2.5 times widths), margins not barbed or ciliate, apices ± truncate, faces sometimes obscurely 1-nerved, sometimes tuberculate, glabrous or hirtellous; pappi 0, or of 2 erect, antrorsely barbed awns or ± deltate scales 0.5 (–1) mm. 2n = 24.

Phenology: Flowering Sep–Nov.
Habitat: Marshes, borders of estuaries
Elevation: 0–100(–300) m

Ala., Ark., Del., Fla., Ga., La., Md., Miss., Mo., N.J., N.C., S.C., Tenn., Tex., Va.

Discussion

Selected References

None.

Lower Taxa