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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 of the Oued M'Zab, about 63 km. from Ghardaia. Retama, Genista 

 and Ephedra are the leading plants in this place. 







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



