References
- Agnew A. D.Q. Upland Kenya Wild Flowers. Oxford University Press. 1974; 165
- De Wilde. Flora of Tropical East Africa, R. M. Polhill. Crown Agents For Overseas Governments and Administrators, London 1975; 28–30
- Jaroszewski J. W., Jensen B. Acta Scand. Serv. B. 1985; 39: 867–875