PLATE 1 6 

 Early flowering stage of Chinese colza: 



A. — Usual form, showing somewhat enlarged stem base and stem-clasping leaves. 

 Almost 5 months old. Grown in greenhouse. Planted September 27, 1916. 



B: — Plant without enlarged stem base. Almost 5 months old. Grown in green- 

 house. Planted February 20, 1917. The rule is 5 cm. in length. 



C. — Usual form, showing glaucous leaves. Two months old. Grown in field at 

 Arlington, Va. Planted about May 1, 1916. 



