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TEXTBOOK OF BOTANY 



ever, and it is sometimes done, as for example with chrys- 

 anthemums, in order to have two or more kinds of flowers 

 on the same plant. With a few exceptions, monocotyledons 

 have not been grafted successfully. . 



243. Methods of Grafting (Figs. 136, 137). The im- 

 portant fact in the actual work of grafting is that only like 

 tissues will grow into union with one another ; that is, bast 

 will unite with bast, wood with wood, and cambium with 



FIG. 136. Various methods of grafting : A and B, two forms of 

 cleft grafts; C, a whip graft. After Gaucher. 



cambium. So, in making a graft, one must match the tissues 

 of the scion with the corresponding tissues of the stock. 

 Especially must cambium be matched with cambium. It is 

 also important that a close joint be made and that the place 

 of union of stock and scion be protected, usually by grafting- 

 wax, until the wounded tissues have healed. Of the many 

 methods of grafting that have been devised, only a few of 

 the commoner ones will be mentioned. In a cleft graft the 

 stock is split, and the scion, trimmed to a wedge shape, is 

 inserted in the split. This method is largely used in the 

 grafting of fruit trees, when the graft is made some distance 



