Alfalfa in Kansas. 



201 



Fid. 175. Keel petal of alfalfa 



flower, spread open, showing the 



pockets for the wing petal projec- 

 tions. 



FIG. 176. Wing petal of al- 

 falfa, showing projection which fits 

 into pocket in keel petal, locking it 

 shut. 



FIG. 177. Pistil of alfalfa flower, surrounded by the ring of ten stamens. Nine of 

 these are joined together; one is free. At the top of each stamen is an anther, which 

 contains the pollen. 



