Alstonia boonei is a very large, deciduous, tropical-forest tree belonging to the Dogbane Family (Apocynaceae).

It is native to tropical West Africa, with a range extending into Ethiopia and Tanzania.

Like many other members of the Apocynaceae (a family rich in toxic and medicinal species), A. boonei contains alkaloids and yields latex.

On the Plateaux Batekes in Congo (Kinshasa) these trees have greatly swollen bases like those of the Bald Cypress and Water Tupelo.

The fruits are pendulous, paired, slender follicles up to 16 centimetres (6.3 in) long, containing seeds bearing a tuft of silky, brown floss at either end to allow dispersal by the wind.