Triunia is a genus of medium to tall shrubs or small trees found as understorey plants in rainforests of eastern Australia.

The members of the genus grow as shrubs to small trees, with simple green obovate to elliptical leaves and new growth covered in reddish hairs.

[5] The four species grow naturally only in eastern Australia between Dorrigo in mid-northern New South Wales and the Wet Tropics rainforests region of north-eastern Queensland.

[3] Two other species are only known to grow about 1,500 km (930 mi) to the north in the uplands and mountains rainforests of the Wet Tropics region of north-eastern Queensland.

[3] In cultivation, all four species grow into garden shrubs with attractive foliage, flowers and fruit, and can tolerate heavy shade to full sun.