Protorhus is a small genus of Afrotropical trees in the family Anacardiaceae. It is dioecious, with male and female flowers on separate plants.[1]
Protorhus is placed in tribe Rhoeae, subfamily Anacardioideae of the family Anacardiaceae. The genus Abrahamia with 19 Madagascan taxa was separated from Protorhus in 2004.(Pell 2004)