CONTEXTS. 



Page. 



Origin and introduction of tho soy boan 7 



Variability ^ 



Classification ^ 



Key to the varieties 1 1 



Descriptions of the variotios 12 



Black-seeded group: 



Buckshot 1 - 



Nuttall 14 



Kingston 1^ 



Ebony 1^ 



Flat King 16 



Riceland 16 



Brown-seeded group: 



Ogemaw 1 ' 



Eda 18 



Baird ^ 18 



Brownie 1" 



Mottled-seeded group: 



• Hankow 19 



Meyer 20 



Green-seeded group: 



Samarow 20 



Guelph 20 



Greenish-yellow-seeded group: 



Yosho 21 



Haberlandt 22 



Tokyo 22 



Yellow-seeded group: 



Ito San 23 



Manhattan 24 



Butterball 24 



Amherst 25 



HoUybrook ^ ■ 25 



Mammoth 26 



List of synonyms 27 



Distribution numbers 27 



Description of plates 30 



5 



