38 



THE BOOK OF ALFALFA 



seeds of Yellow trefoil are shorter and rounder than 

 those of alfalfa, the largest seeds of trefoil measuring 

 0.0629 inch wide by 0.0897 inch long ; whereas the larg- 

 est alfalfa seeds measure 0.0653 inch wide by o.i 153 inch 

 long; so that the largest alfalfa seeds are a trifle wider 

 and more than a third again as long as the largest trefoil 



Yellow Trefoil : Black Medic : Hop Clover {Medicago lupulinoj 



seeds. The smallest seeds of Yellow trefoil are usually 

 plumper and shorter than those of alfalfa (0.05 11 inch 

 wide by 0.0291 inch long, as compared with 0.0496 inch 

 wide by 0.0751 inch long in alfalfa) ; nevertheless, among 

 both the small and the large seeds, so far as the criterion 

 of size goes, individuals occur that equally well belong to 

 either species, and the average differences in size are 



