MODIFICATIONS OF THE FLORAL ORGANS. 

 Fig. 88. 



191 



This pistil is covered by an urceolate glumaceous bag marked u, 



called a perigynium. There is one style st, with three stigmas 



at its summit. 



Fig. 89. 



Fig. 89, is a representation of a common, though exceed- 

 ingly interesting aquatic plant, the Callitriche verna, (*a^of 

 beautiful, and SpiJ hair, in allusion to its capillary and tufted 

 stems.) The lower leaves of the stem are immersed and linear, 

 the upper floating and spatulate. The flowers are polygamous, 

 unisexual and hermaphrodite flowers growing together on the 

 same plant. They are without either calyx and corolla, have 



