Two new North African genera related to Limoniastrum (Plumbaginaceae)

Two new genera are described to include six taxa commonly considered member s of Limoniastrum Heist. ex Fabr. Saharanthus M.B. Crespo & M.D. Lledo nom, nov. is proposed on the basis of the illegitimate Lerrouxia Caball., for a woody species from western Sahara, also known as Caballeroa Font Quer. Cer atolimon M.B. Crespo & M.D. Lledo gen, nov. is proposed for a group of five taxa (four species and one additional variety) of dwarf shrubs with horned spikelets, which show a disjunct distribution on the edges of the Sahara D esert. This latter name applies to most species formerly placed in the ille gitimate Bubania. Types are indicated for all taxa, and identification keys are also presented. (C) 2000 The Linnean Society of London.