CANNON 



PLATE IB 



Fig. 41. Habit of Salsola sp. (below), and Echinopsilon muricatus, from the M'Zab Valley, GHardaia. 





Fig. 42. Ghardaia to Ouargla. View overlooking the hamada about 28ktn. from Ghardaia. The relatively 



abundant vegetation is associated with a light cover of sand over the area shown. The leading 



species are Aristida, Deverra, and Haioxylon. 



