CALYCIFLORiE 199 



of the standard is linear. The pod is long, cylindrical, 

 two-valved, with septa between the seeds. 



The flowers are in bloom from July to September. 

 The plant is a herbaceous perennial. It is 6 in. to 

 2 ft. in height. 



The flowers in structure and mode of pollination 

 resemble those of the Common Bird's Foot Trefoil. 

 The keel is united both above and below with only 

 a small opening at the apex. The anthers are 

 mature before the stigma, and shed pollen into the 

 tip of the keel. The anther-stalks of the longer 

 inner five out of the ten stamens, which are in two 

 groups, are thickened below the anthers, and form a 

 sort of piston mechanism. All the anthers are at one 

 time of the same length, but those of the five longer 

 stamens are then withered. When these latter have 

 shed all their pollen the inner keep the mass of 

 pollen in place. When the wings are depressed, so is 

 the keel. An insect doing this causes the pollen to 

 be forced out in a little mass at the tip. The style 

 becomes covered with pollen. The stigma, how- 

 ever, is only receptive when rubbed, and this is done 

 by the insect, so that there are equal chances of 

 cross- and self-pollination. The insect in pressing 

 its proboscis into the flower covers itself with pollen, 

 and bears this away to another flower. When it 

 leaves, the flower returns to its former position owing 

 to the elasticity of the parts and the hinging of the 

 keel and the alse. The flower contains honey, and 

 the stamens are united, except one. 



