CANNON 







Fig. 75. Detail of square No. 2, near area shown in fig. 74. Ferula and Haloxylon are the leading species. 



Fig. 76. Root-habit of Haloxylon scoparium, 

 from a w£ish near Biskra. 



Fig. 77. Young shoots and mature roots o( Ferula vesceritensis. 



North of Biskra. 



