CANNON 



PLATE 2 



Fig. 4. 



Shoot-habit of Acanthyllis tragacanthoides. 

 Laghouat. 



ig. 5. Shoot-habit of Zollikoferia spinosa. 

 Laghouat. 



'mf&Kg&Mz 



Fig. 7. Zollikoferia spinosa in habitat, plain (hamada). Laghouat. 



