XV] 



LEGUM1NOSJE 



149 



five free petals and ten stamens, so that these organs are 

 perigynous, since they do not spring from the axis. 



Fig. 44. Papilionaceous flowers. A, complete flower of Broom; B, 

 flower of Robinia dissected to show the ovary, the ovary enclosed in the 

 staminal tube, and the standard, wings and keel. 



From the base of the calyx-tube arises one carpel, 

 which ripens into the well-known pod or legume, which 

 gives the name to the order Leguminosce. 



The petals are strikingly characteristic in both form 

 and arrangement : they are never alike in shape or size 

 in the plants here concerned, and their manner of folding 

 in the bud (cestivation) is constantly as follows. 



There is one large posterior, or upper, petal which 



