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culent, and appears, although not very decidedly so (e. g. on 

 account of the numerous stomata upon the upper surface) to 

 be somewhat xerophytic. The hydathode occurs at the apex of 

 the leaf, upon the upper surface (Fig. 19); the epilhema is 



Fig. 20. Saxifraga flagellaris. 



The epidermis of the leaf: A, Upper surface. B, The epidermis of the hydathode. C, 



Upper surface. D, Lower surface, {^'-ii). 



convex. There is no secretion of lime. The veins are without 

 stereom, and surrounded by a colourless sheath (Fig. 19). 



The fleshy leaves of the bulbils contain much starch. The 

 form of their blade is nearly like that of the foliage-leaves, but 



18* 



