Trithuria sect. Trithuria is a section within the genus Trithuria native to Australia.
The dehiscent fruit is a apocarpous monomerous follicle, which splits into three parts. The strongly sculptured seed does not have a thick cuticular layer.
The type species is Trithuria submersa
It has three species:
The section name Trithuria is derived from the Greek words ÃÂÃÂõùàtreis meaning "three", and øàÃÂùàthyris meaning "window". It references the dehiscence of the fruit.
Its species occur in Australia (Southwest Western Australia, Tasmania, and Southeast mainland Australia).
Trithuria sect. Trithuria split from Trithuria sect. Hydatella about 16 million years ago in the Early Miocene.