Breeding experiments whicli show tliat hybridisation and mutation etc. 2^1 



-yu stands for a rubrinervis bud, i. e. one which is roughly quadrangular 

 in shape, bearing long muricate hairs, and rather short sepal tips, but 

 without the red hypanthium and sepal ridges of rubricalyx, hence a 

 relatively green bud. The numbers added in several cases refer to the 

 numbers in the bud-colour series of the coloured plate mentioned 

 above. Similarly, gr in table III refers to a grandiflora type of 

 "bud, i. e. one which is rounded in shape, and glabrous or bearing 

 only a soft, short type of pubescence. 



Fig. 16. Dwarf type in bloom. 



It must first be explained that there is no sharp alternation 

 between these two types of buds. As already mentioned (p. 233), the F| 

 buds are intermediate in shape and pubescence; but in the F2 every 

 conceivable intergrade between the parent types exists (i). This con- 



(>) This fact is made still more obvious by such cases as the following: In plant 

 No. IV. 4 of cult. 66, the main stem bore buds which were stout, somewhat rounded. 



