The Allamanda Bail and Allamanda cathartica L. plant is a species of flowering plant in the family Apocynaceae, native to tropical America. It is a shrub or small tree growing to 5–10 m (16–33 ft) tall, with opposite, evergreen leaves 10–20 cm (4–8 in) long and 4–8 cm (1.6–3.1 in) broad. The flowers are yellow, 5–8 cm (2–3 in) diameter, with five petals. The fruit is a follicle 5–8 cm (2–3 in) long and 3–4 cm (1.2–1.6 in) broad, containing numerous seeds.