Pisonia, Sp. Pl.: 1026. 1753 sec. Bittrich & Kühn 1993
- Type: Pisonia aculeata
- =Timeroyea in Mém. Acad. Imp. Sci. Lyon, Sect. Sci., sér. 2, 10: 247. 1860 syn. sec. Kew WCVP (2019)
The genus includes shrubs, trees and woody climbers characterised by stout spines on the stems and coriaceous fruits with stipitate glands. Its distribution is pantropical with a center of diversity in the Neotropics. Molecular phylogenetic studies (i.e. Douglas & Manos 2007; León de la Luz & Levin 2012) support the monophyly of Pisonia, although the genus was poorly sampled in both studies. Pisonia has not been monographed and the number of species is uncertain; some treatments considered 40 species (e.g. Spellenberg 2001; DeFilipps & Maina, 2003; González 2007) whereas others (e.g. Spellenberg 2003) considered a range between 10-50 species; in the literature there are a lot of accepted and unresolved names.