Tersonia is a genus of flowering plants in the family Gyrostemonaceae.
It is endemic to Western Australia.
They all have a syncarps.
The genus name of Tersonia is in honour of Joséphine Louise Moquin-Tandon, born de Terson (1819âÂÂ1890), wife of the French botanist Alfred Moquin-Tandon (Moq), the author of this genus. It was first described and published in Prodr. Vol.13 (Issue 2) on page 40 in 1849.