Jimsonweed, Jimson-weed, Thorn-apple, Thorn Apple: Datura stramonium (Synonyms: Datura stramonium var. stramonium, Datura stramonium var. tatula, Datura tatula) - Corolla 6-9 cm in length. Calyx 3.5-4.5 cm long with winged ribs, somewhat angled towards the base. Stems more or less glabrous green. Leaves 5-15 cm long, 4-10 cm wide, ovate in shape and coarsely toothed to shallowly lobed. Surface generally glabrous green. Seeds black.
Jimson Weed, Sacred Thorn-apple, Sacred Thorn Apple: Datura wrightii (Synonyms: Datura inoxia ssp. quinquecuspida, Datura metel var. quinquecuspida, Datura meteloides) - Corolla 15-20 cm in length. Calyx 8-12 cm long ribbed rather than winged, not angled towards the base. Stems whitish, puberulent. Leaves 7-20 cm long, entire to coarsely lobed. Surface generally puberulent, often felt gray in color. Seeds tan.