ILLUSTRATIONS. 



Page. 

 PLATE I. Fig. 1. Sicilian sumac (Rhus coriaria) , upper surface. Fig. 2. 



Sicilian sumac (Rhus coriaria) , lower surface 28 



II. Fig. 1. Lentiscus (Pistada lentiscus), upper surface. Fig. 2. 



Lentiscus (Pistada lentiscus), lower surface 30 



III. Fig. 1. Tamarisk (Tamarix africana), showing papillae of epider- 

 mis. Fig. 2. Smooth sumac (Rhus glabra), upper surface 30 



117 (4) 



