S. Nazimuddin and M. Qaiser. Flora of Pakistan 148: 5-8
Plants evergreen trees to 20 m tall or more; bark grey, rough; lenticellate branches glabrous. Leaves petiolate, petioles 0.5-1 cm long, ending in a thick hooked gland on the upper side; blades 9-20 cm long, 2-5 cm wide, in whorls of (4-)5-7 (-10), coriaceous, glabrous, shining, oblong-lanceolate or obovate, obtuse or shortly acuminate, with 25-60 pairs of lateral veins, margins entire. Inflorescences many flowered, umbellately branched, composed of clusters of capitate cymes, pubescent or tomentose; peduncles 2-5 cm long; pedicels 2-5 mm long; bracts oblong or lanceolate, acute, pubescent. Flowers greenish-white, 6-12 mm long; calyces about 2 mm long, pubescent, peristent, lobes oblong-ovate, obtuse; corollas with cylindric tubes about 6 mm long and ovate lobes 3-5 mm long; disk absent, Follicles 30-60 cm long, 3-5 mm wide, pendulous.
Alstonia scholaris is native from India to Indonesia, tropical Australia and Africa. It is cultivated as an ornamental in Pakistan.
The inner bark of Alstonia scolaris is used as a source of an antim-malarial drug (S. Nazimuddin and M. Qaiser, Flora of Pakistan 148: 8).