256 



TOBACCO LEAF. 



FIG. 72. DEVELOPMENT OF YOUNG BROOM RAPE. Three-fourths 



natural size. 



a, A plant which Is just beginning to put out the stalk bud and the fibrous roots; 

 6, a later stage when the closely placed fibrous roots form conspicuous pronr 

 inences which conceal most of the surface; c, two parasites at a still later 

 stage, the right one turned so as to show the bud, now of considerable size; 

 d, a still later stage, with a short stem and bracts; e, a well-grown young par- 

 asite as it pushes through the ground at the surface, its long, fibrous roots not 

 yet attached to those of the host plant; /, a young plant which was grown in 

 packed soil, with several lateral buds which would have produced branches. 



