430 THE STRUCTURE OF ECONOMIC PLANTS 



"In addition to the bud that continues the growth, there are buds 

 in the axils of the leaves of the fruiting branches, and if these develop 

 they may produce vegetative branches of the usual form. In other 

 cases the axillary buds of the fruiting branch may produce very short 

 vegetative branches, and these may give rise in turn to very short 

 fruiting branches, so that one joint of a fruiting branch may appear 

 to bear two or three bolls in an exceptionally fertile plant. Careful 

 examination will show that only one boll is borne directly on the 

 joint and that the others come from branches of the short axillary." 



- -ax 2 



—pe 1 



stip 1 



-ax b 2 

 -ped 1 



Fig. 12.1. A, portion of fruiting branch showing parts of two sympodia. The termi- 

 nation of axis I is the flower whose pedicel is shown, together with leaf and stipules : ax i, 

 ■L, axes I and r; ax b z, axillary bud developed from axis i; pe i, petiole; ped i, pedicel of 

 flower; stip i, stipule : B, outline of transection of terminal bud of fruiting branch showing 

 three sympodia and terminal of fourth axis (axillary fruiting branches not shown): fi i, 

 i, 3 ; /, I, 2., 3 ; st i ; and t, flowers, leaves, stipule, and terminal for respective sympodia : 

 C, lower level on sympodia i and i with greater enlargement: ab, axillary bud of axis 3, 

 ax 3. (After Gore.) 



King (14) points out that 



"The axillary buds and branches on the fertile branches of Egyptian 

 cotton differ in morphology and behavior from those on upland cotton. 

 In the Pima variety of Egyptian cotton rudimentary axillary branches 

 begin development with the advent of minute triangular buds in the 

 axil of each leaf, but ordinarily this development is cut short by the 

 shedding or drying up of the buds, which maintain active growth 

 for only a few days. In upland varieties the axillary buds usually 

 remain dormant, but they can be stimulated to growth at any time 

 later in the season." 



