1. Baker, J. G. (1894). Diagnoses Africanae II. Bull. Misc. Inform., Kew 1894: 66 – 74.
2. ____ & Rendle, A. B. (1905). Convolvulaceae. In: W. T. Thiselton-Dyer (ed.), Flora of Tropical Africa 4 (2): 62 – 206. Lovell Reeve, London.
3. Balfour, I. B. (1883). Diagnoses Plantarum Novarum III. Proc. Roy. Soc. Edinburgh 12: 83.
4. ____ (1887). Botany of Socotra. Trans. Roy Soc. Edinburgh 31: 58, 194.
5. Beard, J. S. (1965). Descriptive catalogue of West Australian plants. Society for growing Australian plants, Sydney.