42.8 



THE STRUCTURE OF ECONOMIC PLANTS 



"A single segment of a fruiting branch consists of an internode, a 

 leaf with stipules, the flower bud, and two axillary buds one of which 

 remains dormant and becomes the axillary bud of the fruiting branch 

 while the other continues the secondary axis. The fruiting branch 

 of cotton is made up of a series of these segments which gives to the 

 entire structure a jointed appearance. (Fig- 2.2.1, A.^ . . . The 

 first evidence of the development of a fruiting branch is a primordium 



D 



fa oT 



fd 



y 



b\ 

 b'i 



\d 



\d 



op Hi 



'» " 



a' 





b^i 



6^'L 





G 



^cndodcnnis 

 ^ptricyde 

 IM phloem 

 (HO cambium 



■ •^•i/fem 



Q] parenchyma 



Fig. ■Li.'). Diagrams illustrating vascular transition : A, transection at root level; B and 

 C, lower hypocotyl ; D and E. middle hypocotyl ; F-l, upper hypocotyl ; /, cotyledonary 

 node. (After Spieth.) 



