Bridson (Baill.) 1987 - Bridson DM (1987) Studies in African Rubiaceae: Vanguerieae: A New Circumscription of Pyrostria and a New Subgenus, Canthium subgen. Bullockia. Kew Bulletin 42(3): 611-639. doi: 10.2307/4110068.
There is no corrections for Pyrostria phyllanthoidea yet.