CUCURBITA 



603 



Fig. 314. The transition region: A, dissected siphonostele with four transition bundles, 

 each with a tangential band of metaxylem terminated at either end by protoxylem ; the 

 outer phloem masses are joined across rays by connective phloem, and inner phloem is contin- 

 uous with outer phloem ; B, complete endarch bundles in region just above peg. One of 

 anastomosed end bundles is branching. (Photomicrographs by Whiting.) 



