H.J. Beentje 
Flora of tropical East Africa – Balanitaceae (2003) [PDF ebook] 

Prepared at the Royal Botanic Gardens, Kew, in close collaboration with the East African Herbarium and in liaison with the University of Dar es Salaam, the University of Nairobi and the Makerere University, this series is designed to the highest academic standards and is a useful reference for anyone concerned with the identification and utilizatio