HIPPURIS. 



Calyx, a 2-lobed rim, crowning the germen. 



Corolla, none. 



Stamen. Filament single, upright, fixed within the outer lobe 



of the calyx. Anthera roundish, compressed. 

 PiSTrLLUM. Germen oblong, beneath. Style single, upright, 



awl-shaped, longer than the stamen, fixed to the inner lobe 



of the calyx. Sligma acute. 

 Pericarpium, none. 

 Seed, single, roundish, naked. 



N. B. Mr. Curtis describes the stamen as standing upon the 

 top of the germen ; and says, that at the close of summer, he has 

 found flowers without a stamen ; and Scopoli has observed, that 

 such flowers are sometimes intermixed with the others. 



CALLITR1CHE. 



Calyx, none. 



Corolla. Petals 2, bowed inwards, channelled, opposite to 



each other. 

 Stamen. Filament single, long, bowed. Anthera simple. 

 Pistilla. Germen nearly round. Styles 2, hair-like, bowed. 



Stigmata acute. 

 Pericarpium. Capsula roundish, compressed ; with 4 angles, 



and 2 cells. 

 Seeds solitary, oblong. 



N. B. Seeds 4, naked with a membranaceous border on the 

 outer edge. — In the Callitriche verna, the stamen and pistilla 

 are found in separate flowers, but growing on the same plant. 

 But sometimes, even in this species, flowers are found which 

 contain both the stamen and pistilla. 



