Alstonia angustiloba is a tree in the dogbane family Apocynaceae.
Alstonia angustiloba grows as a large tree up to tall, with a trunk diameter of up to . The bark is greyish or brownish. Its fragrant flowers feature a white, yellow or cream corolla. The fruit is brownish, up to 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 altitude.
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