White henbane

Herbs biennial or perennial, 0.3–0.9 m, not aromatic. Stems branched. Leaves: cauline leaves all petiolate; blade broadly lanceolate to ovate, 4–7.3 × 3–7 cm, base not clasp­ing, margins coarsely toothed to shallowly lobed, lobes pinnate, broadly triangular, 0.5–1.2 cm, apex acute. Flowers: calyx 8–15 × 5–10 mm, lobes tri­angular, apex acute-apiculate; corolla creamy white to pale yellow with greenish yellow, or purple throat greenish, veins pale, 10–15 × 12–18 mm, tube narrow, 6–9 × 3–4 mm, lobes broadly triangular-ovate, 4–6 × 4–8 mm, apex rounded, rarely emarginate, often glandular-hairy abaxially in lower half; stamens 15–20 mm; filaments 13–18 mm; anthers 2 × 1.1 mm; ovary 1.5–2 × 1.5–2 mm; style 15–16 mm. 2n = 34, 68.

Flowering May–Sep. Waste places, roadsides, ballast piles; 0–200 m; introduced; Ont.; Fla., N.J., Pa.; Eurasia; n Africa; introduced also in Australia.

Hyoscyamus albus collections from Pennsylvania are from ballast and waste ground in Philadelphia; the most recent collections date from 1921 (A. F. Rhoads and W. M. Klein 1993). The report of H. albus from Florida is based on a record from ballast in Pensacola by C. T. Mohr (1878).