1. Baker, J. G., 1894: Botany of the Hadramaut expedition. Kew Bull.1894, 330.
2. ?, 1895: Plantarum novarum in Herbario Horti regii conservatorum, Dec. xx. Kew Bull.1895, 181.
3. Balfour, I. B., 1888: Botany of Socotra, Trans. Roy. Soc. Edinb.31, 43.
4. El Hadidi, M. N., 1966 a: The genusFagonia L. in Egypt. Candollea21, 13?54.
5. ?, 1966 b: Anatomical features of the stem in Egyptian species ofFagonia L. Candollea21, 357?364.