Description from Flora of China
Nerium indicum Miller; N. odorum Solander.
Stem to 6 m tall. Leaves very narrowly elliptic, 5-21 X 1-3.5 cm, leathery, base cuneate or decurrent on petiole, apex acuminate or acute. Flowers showy, fragrant. Sepals narrowly triangular to narrowly ovate, 3-10 mm. Corolla purplish red, pink, white, salmon, or yellow, tube 1.2-2.2 cm; lobes 1.3-3 cm, single or double. Follicles cylindric, 12-23 cm. Seeds oblong, coma 0.9-1.2 cm. Fl. spring-autumn. 2n = 22.
All parts of the plant are extremely toxic. The seed-oil content is up to 58.5%.
Yunnan, widely cultivated and naturalized in tropical, sub-tropical, and temperate parts [Asia, Europe, North America]