62 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XVIII. 



More than ^ of the flora of Aden is identical with plants of the 

 Indo-African desert. About half this number is spread over the whole 

 region, whilst the rest is confined to a smaller area. It is, of course, 

 impossible to draw accurate lines between the desert and the steppe- 

 region. The transition from one botanical area to another is never a 

 sudden one, and the same species may be common to both regions. 

 Thus, we might have included under the foregoing groups some plants 

 which now we are going to give in the following as being characteristic 

 of the desert-flora : — 



Species. 



1. Cocculus leteba 



2. Dinlotaxis pendula 



3. Diptervgium glaucum 



4. Meerua crasslfolia 



5. Cad.iba farinosa .. 



6. CapparN galeata .. 



