A Mosaic Leaf 



When a purple-leaved plum is hybridized with a 

 green-leaved plum, the hybrids of the first generation have 

 green leaves, but purple leaves reappear among the varying hybrids 

 oj the second generation. Occasionally, however, a cross between 

 purple-leaved and green-leaved varieties, where the varieties 

 lie near the limits oj affinity, results in a condition 

 that might be described as a mosaic, the leaves par- 

 taking oj the characteristics oj both ancestral 

 strains. This picture illustrates such a case. 



