alstonia(n = noun.plant) genus alstonia - genus of evergreen trees or shrubs with white funnel-shaped flowers and milky sap; tropical Africa to southeastern Asia and Polynesia;
is a kind of dicot genus, magnoliopsid genus
is a member of apocynaceae, dogbane family, family apocynaceae
genus of evergreen trees or shrubs with white funnel-shaped flowers and milky sap; tropical Africa to southeast Asia and Polynesia. [WordNet 1.5]