I.] 



LEGUMINOS^E. 



This very large and important Order requires illustra- 

 tion by two Types ; one to represent the genera with 

 irregular flowers and imbricate petals, the other those with 

 regular flowers and valvate petals. The former only are 

 represented in Britain. They are grouped under the 

 Tribe PapilionacecB the Pea-flower Tribe, of which we 

 may take as 



Type Garden Pea (Pisum sativiim}. 



A weak climbing annual herb, with alternate stipulate 

 compound leaves ending in tendrils, and irregular (papil- 

 ionaceous) flowers. 



OBSERVE the relation of the petals of the irregular 

 corolla to each other. There is a large upper petal which 



FIG. 98 Embryo of Pea with the 

 cotyledons laid open, showing 

 the curved plumule and radicle. 



O.B. 



FIG. 99. Seed of same before 

 removal of the testa, show- 

 ing the hilum and ridge 

 above indicating the position 

 of the radicle inside. 



L 



