Alstonia spatulata, also called hard milkwood or Siamese balsa, is a species of tree in the family Apocynaceae. It is found in Cambodia [(Deum Chias ដើមជាស) or (Deum Satba ដើមស័ត្បា), or Deum Chamrong Preah Ream ដើមចំរុងព្រះរាម)], Indonesia, Laos, Malaysia, Papua New Guinea, the Philippines, Singapore, Thailand, and Vietnam.

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