B.  Jonsell, ?Lepidium L. (Cruciferae) in tropical Africa?, Bot. Not, vol. 128, pp. 20 - 46, 1975.

H.  Runemark, ?A revision of Parapholis and Monerma in the Mediterranean?, Bot. Not, vol. 115, no. 1, pp. 1 - 17, 1962.