BY THE SELECTION OF SOMATIC VARIATIONS. 57 



not possessed by any of the parents; for example, there is no evidence 

 that a yellow element of variegation was present in any of the parent 

 species. In leaf-shape also, many new types have arisen. Hybridi- 

 zation and rather intense and artificial cultivation have been associated 

 with the development of such diversity from plants comparatively 

 simple. 



Considering the various types of Coleus as a whole, we may note 

 that the wide range of variability which they exhibit is in large measure 

 realized in the bud variations that have appeared from the single 

 types here reported. The green, green-yellow, yellow-red blotched, 

 and green-solid red are extreme forms that are in degree and quality 

 counterparts of the extremes seen in the different varieties. In the 

 development of the laciniate character of the leaf-shape in which the 

 leaves on a single plant fluctuate from entire to extremely laciniate, 

 the counterparts of cut-leaved quercifolia and salicifolia types are 

 in large degree realized. 



In seed progeny and in bud variations the single strain of Coleus 

 investigated has in the 3 years of observation shown the same types of 

 variation that have developed in the entire series of cultivated varie- 

 ties derived by both seminal and vegetative variations. 



