Alstonia (Alstonia scolaris, A constricta): There are 43 species of alstonia trees. The bark of the tree is used medicinally in the Pacific Rim and India. Constricta, which is native to Australia, is used extensively as an Aboriginal folk remedy for fever, chronic diarrhea, dysentery and rheumatism. Scholaris, found growing mostly in India, Pakistan and the Philippines, is used for the same purposes, [...]