Fig. 363. South-west African desert. Welwitschia mirabilis on a sandy stony plain to 

 the north of Tsoaaub, Uamara-land. From a photograph by A. Schenck. 



FlG. 364. South-west African desert. River bed of the Khusub near Gagngam, Nama Land. 

 Left hand : Acacia giraffae. In the centre : Euclea pseudebenus. To the right : Acacia spinosa. 

 From a photograph by A. Schenck. 



To face p. 628.] 



