THE DIFFERENTIATION OF FLOWER-BUDS 47 



in one of the stamens of the innermost cycle. Each of the 

 main bundles of the inner c^'cle alternates with a carpel and 

 its terminations are in the stamens of the middle and outer 

 cycle, the petal, and the lobes of the calyx. Large branches 



l\JB-\- 



FiG. 21. — Diagram illustrating distribution of bundles in the torus and 

 pedical apex. Note the separation of carpellary and toral sys- 

 tems, the region of anastomosis below the carpels, and ending of 

 bundles, {i v c) inner vascular cylinder, (o) bundles supplying ovule, 

 (p c b) placental carpellary bundle, (c) carpel, (s c h) net work of 

 secondary carpellary bundles, {d c h) dorsal inner primary toral 

 bundles, (c h) secondary cortical bundles, (s) bundles to sepal, 

 {sti sti stz) bundles to first, second and third cycles of stamens, 

 (p) bundle to petal, (p dotted) pit region. 



from all of these main bundles also extend outward into the 

 cortex, where they are subdivided into many smaller fibers 

 which anastomose to form a close network in the cortex. 

 None of these bundles extends into the pith. (See Fig. 21.) 



