Bibliography for Tropical Africa :
- EXELL, A. & WILD, H. (1983). Flora Zambesiaca: Mozambique, Federation of Rhodesia and Nyasaland, Bechuanaland Protectorate. London Kew
Bibliography other :
- (2004). The families and genra of vascular plants. VII Lamiales. Kaadereit J.W. & K. Kubinzky : 39-44
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