DESCRIPTION OF PLATES, 



Plate I. Frontispiece. Fig. 1. — Plant of liairless Orel clover, almost mature. Fig. 2.— 

 Mature plant of American red clover. 



A portion of the pknt from which figure 1 was made has been deposited in the 

 United States Ni-tional Herbarium (No. 409983) as a type specimen of Trifolium 

 fratense Y&v. foliosum. Formalin material from the same plant is preseived in the 

 Laboratory of Plant Life History. ♦ 



Plate IL Fig. 1. — Stems, stipules, and bases of petioles of American and of hairless Orel 

 clover ill times natural size). Fig. 2. — Young plants of hairless Orel clover and 

 American red clover, showing smooth and hairy types (five-eighths natural size). 



The photographs from which Plates I and H were made are of seventeen-months- 

 old plants of the second crop, grown on the farm of the Minnesota Experiment 

 Station, at St. Anthony Park. 



Plate IH. Fig. 1. — Large plats used in clover experiments. North Dakota Agricultural 

 College, Agricultural College, N. Dak. (Negative by O. O. Churchill.) Fig. 2.— Small 

 plats used in experimental work, Ontario Agricultural College and Experiment Station, 

 Guelph, Ontario. (Photograph furnished by Prof. C. A. Zavitz.) 



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