CANNON 



PLATE 20 













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Fig. 46. Vegetation on edge of the Oued M'Zab, about 63km. east of Ghardaia, showing 

 habitat of Rhantherium adpressum in foreground. 



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Fig. 47. Sandy flood-plain ol the Oucd M Z.ab, about bJi km. Ironi Uhardaia. Ketama, Lieniita 

 and Ephedra are the leading plants in this place. 



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Fig. 48. Habit of Ephedra alata in habitat shown in figure 47. This specimen was 1.5m. high. 



