Polyosma alangiacea, commonly known as white alder, is a tree in the family Escalloniaceae which is endemic to northeast Queensland.

The natural range of this species is the sub-coastal ranges of northeast Queensland from near Cooktown south to the area around Eungella, west of Mackay.

It grows in well developed rainforest at altitudes from 400 to 1,200 m (1,300 to 3,900 ft), on volcanic soils (derived from basalt or granite).

[4][5] The white alder has been given the status of least concern by Queensland's Department of Environment, Science and Innovation.

[1] As of 31 January 2024[update], it has not been assessed by the International Union for Conservation of Nature (IUCN).