Gates, Tetraploid Mutants and Chromosome Mechanisms. 



shows the comparative dimensions of the flowers. To this are 

 added measurements of two typical flowers from 0. yigas Sweden, 

 to be described shortly. 



One of the typical plants above described (No. I, 10) showed 

 an interesting peculiarity in the absence of an absciss layer between 



Fig. 2. 0. gigas Italy, cult. 227 / 12 . I. 5. 



the hypanthium and ovary, so that all the faded flowers remained 

 permanently attached to the plant, even weeks after blooming. 

 Plant No. I, 5, showed the same feature partly developed (cf. fig. 2) 

 and it appeared slightly in No. I, 11. It seems that in all the 

 giant races of Oenothera the flowers tend to remain attached longer 

 than in other forms. 



