cannon 



PLATE 34 





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Fig 78. Root-habit of Fagonia growing on edge of a wash. Biskra. 



Fig. 79. Large lateral root of Hal- 

 oxylon, with numerous deciduous 

 rootlets, no longer functional. 



Fig. 80. Shoot-habit, taken from above, of Fagonia from the flood-plain of a small oued near Biskra 



