Alstonia angustiloba is a tree in the dogbane family Apocynaceae.
Alstonia angustiloba grows as a large tree up to 40m (130feet) tall, with a trunk diameter of up to 60cm (20inches). The bark is greyish or brownish. Its fragrant flowers feature a white, yellow or cream corolla. The fruit is brownish, up to 35cm (14inches) long.
Alstonia angustiloba is native to Thailand, Peninsular Malaysia, Singapore, Sumatra and Java. It is found in a variety of habitats from sea level to 200m (700feet) altitude.