2. Nicotiana rustica Linnaeus, Sp. Pl. 1: 180. 1753.
黄花烟草 huang hua yan cao
Herbs annual, 40-60(-120) cm tall, with viscid, glandular hairs. Petiole 5-15 cm; leaf blade ovate, oblong, or lanceolate, 10-30 cm, membranous, glandular hairy, base cordate or rounded. Inflorescences many-flowered, compact to lax panicles. Pedicel 3-7 mm. Calyx cup-shaped, 7-12 mm; lobes deltate, unequal. Corolla greenish yellow, tubular; tube 1.2-2 cm; limb ca. 4 mm in diam.; lobes short, obtuse, apiculate. Stamens unequal. Capsules subglobose, 1-1.6 cm. Seeds brown, oblong, ca. 1 mm. Fl. Jul-Aug.
Cultivated in Gansu, Guangdong, Guizhou, Qinghai, Shanxi, Sichuan, Xinjiang, Yunnan [native to South America]
Used for tobacco and as an insecticide.