Alstonia macrophylla, the hard alstonia, hard milkwood or big-leaved macrophyllum, is a species of plant in the family Apocynaceae.
It is native to Indonesia (Kalimantan and Sulawesi), Malaysia, the Philippines (Tagalog: batino), Thailand, and Vietnam. It was introduced to Sri Lanka, where it is known as hawari nuga by local Sinhalese people.
Alstonia macrophylla is a tree with a straight trunk and a high, narrow crown. It can grow up to 30 meters tall. The trunk and branches contain a white latex. ...