Psiloxylon mauritianum (known locally as "Bois Bigaignon") is a species of flowering plant, the sole species of genus Psiloxylon. It is endemic to the Mascarene Islands (Mauritius and Réunion) in the Indian Ocean. It is a white-barked evergreen tree, bearing essential oils. It was formerly placed alone in family Psiloxylaceae, but is now considered a basal member of the family Myrtaceae.