275 



- ves. 



yu.^.c. 



Fig. 19. 



Transverse section through leaf of Rhagodia Gaudichaudiana. 



ves.. Vesicles ; chlor., Chlorenchyma ; s.v., Secondary 



vein ; w.s.c, Water storage cell. x 186. 



epidermis consists of small uncutinised cells ; the stomates are relatively numerous. 

 They are small, undifferentiated, guard cells on the same general level as the 

 rest of the epidermis. The epidermal hairs are of the same general type as in 

 Atriplex vesica/riiim, but they differ from those of the latter in retaining their 

 stalk cell when mature. Each hair consists of a basal epidermal cell with a 

 large nucleus, a short stalk cell with thickened walls, and a large balloon-like 

 terminal vesicle. The function of the latter is probably that of water storage. 



Kochia sedifolia. (Figs. 20 and 21.) 



The "bluebush," Kochia sedifolia, forms rounded bushes about 2 to 3 feet 

 high. The leaves are approximately cylindrical and about one centimetre in 

 length. Kochia sedifolia is a distinctly succulent type (fig. 20). The epidermis 

 is uncutinised. Below the epidermis lies a ring of palisade parenchyma usually 

 two cells thick. The central tissue is composed of large, irregular, water-storing 

 cells free from chloroplasts, but often containing crystals of calcium oxalate. 



