From The Archives of the Rare Fruit Council of Australia::
William F. Whitman of Florida reported many years ago that the 'Bali' salak was monoecious whilst other salaks were dioecious. Since then we have had many conflicting reports, including the story that Mr. Whitman did not see the male trees growing around the perimeter of the salak orchards he visited in Indonesia. However, individual salaks have now fruited in North Queensland, thus proving Mr. Whitman correct in his observations.