Millingtonia Hortensis is a plant belonging to the genus Nicotiana in the Bignoniaceae. Distributed in Cambodia, Laos, Thailand, Myanmar, Indonesia, India, Vietnam, Malaysia, and Yunnan in mainland China, Millingtonia Hortensis grows in areas with an altitude of 500 to 1,200 meters. It mostly grows in dense forests on low hills and has not yet been introduced artificially. Cultivated.

Trees, 8-25 meters high, with rough bark. 2-3 pinnate compound leaves are 40-100 cm long; leaflets are elliptical, ovoid or ovoid-oblong, (2) 5-7 cm long, 1.5-4 cm wide, with acuminate tip, round base, Oblique, entire, glabrous on both sides, 4-5 pairs of lateral veins, petioles up to 1 cm long, and lateral lobules sometimes nearly sessile. The cymes are terminal, 25 cm in diameter.
The inflorescence axis and pedicel of Millingtonia Hortensis are light yellow pilose; bracts and bracteoles fall prematurely; pedicels are thin, about 1 cm long. The calyx is tiny, cup-shaped, 2-4 mm long and wide, shallowly wavy, 5-lobed, and the lobes slightly reflexed.
The corolla of Millingtonia Hortensis is white, the corolla tube is slender, 3-7 cm long, 2-3 mm in diameter at the base, corolla lobes 5, spherical when budding, lobes ovate-lanceolate, 1-2 cm long, the inner surface is along the edge Densely pilose. The stamens are 4, 2 strong, hidden or slightly exposed, and 2 anthers, only one is developed, and the other one is degraded. Flower disk ring-shaped.
The style of Millingtonia Hortensis is slender, the stigma is exposed, and the ovary is long cylindrical, glabrous, with many ovules, and 4 columns. Capsule linear, 30-35 cm long, 1-1.5 cm wide, compressed. The seeds are disc-shaped, tiny, with wings 1.5-3.5 cm long and 1-1.5 cm wide, oblong, with membranous peripheral wings. Millingtonia Hortensis blooms from September to December.