STEM APPENDAGES. 



1C9 



leaf. When the leaves are smooth they are called gla- 

 brous, and if not, they are called pubescent woolly, or 

 hairy, according to the degree of roughness. When the 

 leaves are merely smooth they are called glabrous, but if 

 they have a polished surface, then they are called shin- 

 ing. When the leaves are covered with a whitish bloom, 



FIG. 35, PORTION OP VINE WITH TENDRHi. 



or waxy substance that readily rubs off, they are called 

 glaucous. 



There is also a great difference in the texture of 

 leaves ; some are very thick and tough, while others are 

 brittle. But the thinness or thickness of the leaf does 

 not indicate the strength, for some that are quite thin 

 are very strong and enduring. 



Other characteristics of vine leaves might be men- 

 tioned, but enough have already been given to show that 



