﻿VIRESCENCE OF OXALIS STRICT A. 



103 



latter point there are so many of them as to form a small 

 fringe. These hairs are appressed and identical with the 

 appressed hairs on other portions of the plant. Less numer- 

 ous are the very short, more or less pear-shaped, unicellular 

 hairs Very unfrequently a thin-walled, one- or several- 

 celled hair is met with. These hairs are identical with those 

 which may be observed, with the naked eye, on the stem, etc., 



4 BACK OF VIRESCENT PETAL, X ^00. 



and which often give a woolly appearance to some portions 

 of the plant. Stomata are quite frequent. Numerous 

 crystals of calcium oxalate can be seen. The cells, which are 

 longer than broad, possess smooth cell walls. The ridges, so 

 marked in the cells of the epidermal layers of the petal, are 

 entirely absent. The interior surface of the sepal shows as a 

 rule no hairs, though occasionally one of either of the three 



