It is a shrub with egg-shaped to lance-shaped leaves with the narrower end towards the base, flowers with five sepals, five cream-coloured to white petals and fifteen to seventeen stamens.

Triplarina nowraensis is a shrub that typically grows to a height of up to 3.5 m (11 ft) and has a grey, scaly bark on the branchlets.

[3][4] Triplarina nowraensis was first formally described by Anthony Bean in 1995 and the description was published in the journal Austrobaileya from specimens collected near Flat Rock Dam, Nowra in 1994.

[3] This triplarina grows in moist heath near streams or swampy slopes in the Nowra district.

[3][4] Triplarina nowraensis is classified as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 and the New South Wales Government Biodiversity Conservation Act 2016, and a national recovery plan has been prepared.