NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 



The size of these cultures is given in table VI. 



Table VI. 



Among the mutants the rubrinervis, both cana, one lata and 

 some nanella have flowered. The individuals of pallescens and 

 Lamarckiana, which did not flower, were examined in June and 

 July as large rosettes. Most of the flowering specimens were observed 

 during the months of August and September. 



The percentage figures of these tables vary from 23 to 43, the 

 means for the 3 families being 33, 35 and 37 per cent, and the total 

 mean being 35 per cent. On account of the evident weakness of 

 the individuals of the pallescens type, as compared with their 

 Lamarckiana-Wke sisters, these figures may be assumed to show 

 that the splitting into two main types took place in about equal 

 parts. The splitting is constantly repeated from the pallescens 

 specimens, but the progeny of the Lamarckiana type retain this 

 type uniformly. 



I have made only one cross in these families, and that in order 

 to ascertain the properties of the pollen of the pallescens indi- 

 viduals. I placed this pollen on the stigma of some flowers of 

 Lamarckiana in 1913 and got from the seeds a uniform generation 

 of 60 flowering individuals, all of which proved to be Lamarckiana. 

 I conclude from this fact that the pollen of the pallescens plants 

 does not transmit the characters of the race, exactly as in 0. scin- 

 tillans and 0. cana. 



0. Lamarckiana lata mut. Lactaca (fig. 5, C).— In the summer 

 of 1913 I found, in a race of 0. lata which had been fertilized in the 

 previous generations (1905 and 1907) by 0. Lamarckiana, a weak 

 plant which seemed to be new to me, but showed evident signs of 

 affinity with the inconstant types of 0. cana and 0. pallescens as 



