38 



THE BOOK OF ALFALFA 



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

 seeds. The smallest seeds of Yellow trefoil are usually 

 plumper and shorter than those of alfalfa (0.05 ii inch 

 wide hj 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 



Yellow Trefoil: Bkck Medic: Hop Clover. {Medicago lupulind) 



not so great as the differences found on comparing the 

 largest and the smallest seeds of the two species, the 

 average for the trefoil being 0.0574 inch by 0.0799 inch, 

 and for alfalfa 0,0582 inch by 0.0944 inch. So it will be 

 seen at once that while trefoil seeds as a rule are smaller, 



