I.] 



LEGUMINOS^E. 



147 



encloses the stamens. From a fancied resemblance to a 

 butterfly, this form of corolla has been called papilio- 

 naceous. In the Tribe Caesalpinieae, not represented in 

 Britain, the upper petal is inside in the bud. 



FIG. 102. Petals of Bean : a standard (pexillutti), bb wiags (alai), 

 c coherent petals of keel (farina). 



FIG. 103. Diadelphous stamens of Pea. 



FIG. 104. Monadelphous stamens of Broom. 



Observe, also, the spinose branches, rudimentary 

 leaves, and bipartite calyx of Common Furze (Ulex euro- 



L 2 



