Plagianthus regius or lowland ribbonwood is a tree that is endemic to New Zealand.

A profusion of small white or green flowers appear in dense clusters in spring making it easier to distinguish from the similar lacebark genus.

One of the distinctive aspects of this tree is that it is usually deciduous which is unusual for New Zealand, although in the northern areas it can be semi-deciduous.

A subspecies from the Chatham Islands, Plagianthus regius subsp.

[5] The bark of the tree was used in Māori traditional textiles such as in fishing nets.