David Starr Jordan 



desired qualities of the two species have been com- 

 bined and other valuable new qualities incidentally 

 developed as regeneration and selection proceeded. 



In hybridizing callas, the yellow ones with the 

 white, to form a hardy yellow race, some of the re- 

 sultant plants have pale flowers, some light yellow, 

 and those chosen are made deep yellow by selec- 

 tion from second and later generations. Both 

 parent plants in this case have leaves blotched with 

 white, and this is found in all the descendants. 



Hybridizing the wild flower, Erysimum arkan- 

 sanum, which is yellow, with a native wild white 

 species, resulted in the first generation a perfect 

 blend of yellow and white; with a second gener- 

 ation the species separate completely, about five 

 per cent of those examined being yellow, the 

 other ninety-five per cent white ; white dominant. 

 With a hybrid Tfialictrum, seed pods are devel- 

 oped more abundantly than with either parent, 

 but the seeds are not produced. 



We may expect variations in form, size, color, 

 quality, fragrance, vigor or any other characteristic. 



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