Alstonia

noun

Al·​sto·​nia ȯl-ˈstō-nē-ə 

: a genus of trees or shrubs (family Apocynaceae) found in tropical Asia, Australia, and Polynesia having white funnel-shaped flowers and including several (especially A. constricta) whose bark has been used medicinally for its antiperiodic and antipyretic properties (as in the treatment of malaria)