262 



segments, are shori and have undulating walls (straight-walled, 

 however, above the veins and at the base of each hair). Upon 

 the rest of the leaf-blade the epidermal cells are large and 

 straight-walled; this also applies to the leaf-stalk, only its 



Fig. 13. Saxifraga groenlandica. 



A (2/i), Leaf-form. B, Epidermis of the upper side of the leaf-stalk. C, Epidermis of the 



lower surface of the leaf, near the midrib. D, Epidermis of the lower surface, just above 



the midrib. E, Longitudinal section of leaf. (A, B. C, D and E ™Vi). 



epidermal cells, above the veins, are somewhat narrower than 

 those upon the leaf-blade. Glandular hairs are found in numbers 

 upon the leaf-segments, and are fewer in number upon the rest 

 of the leaf-blade and along the margin of the leaf-stalk. The 

 upper side of the leaf-stalk is very slightly hairy. The stomata 

 are numerous and evenly distributed upon the leaf-segments; 



