88 



NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 



Table II. 



In each case the self-fertilized seeds of only one cana were 

 studied, besides those of the mutants, and also tjiose of only one 

 atavist of the Lamarckiana type. The progeny of the latter proved 

 to be uniform and like the parent, about one-half of the plants 

 being studied in the flowering condition and the remainder in the 

 stage of large rosettes of radical leaves in July. The lata mutant 

 has flowered, as have the majority of the dwarfs. Two mutants 

 of a new type arose, which will have to be described in another 

 paper. They resembled 0. rubrinervis, but lacked the characteristic 

 brittleness of the stems of this form. 



The second generation of mutant no. 3 has been the most 

 vigorous one of all my annual cultures of 0. cana. It was grown, 

 moreover, under exceptionally favorable conditions. For this 

 reason it has been chosen for making a series of crosses, which will 

 be dealt with at the end of this article. The fact that, in this case, 

 the percentage figures come so much nearer to equality of the two 

 types than in the other cases is probably owing to this striking vigor 

 of the race. The means are 25 per cent cana for no. 1 and no. 2, but 

 53 per cent cana for no. 3. The proportion of mutants among the 

 seedlings of the cana individuals is 18 in 350, or about 5 per cent. 



0. cana from lata nos. 4 and 5.— As previously mentioned, the 

 progeny of two further mutants of the same origin have been 

 studied. The offspring of one of them embraced only 15 individuals, 

 of which 13 have flowered. There were 3 cana, 2 mutants (one 

 oblonga and one of the same new type as in no. 2), the 10 remaining 

 plants being externally like 0. Lamarckiana. The second original 

 mutant yielded only 1 1 offspring, among which 7 were cana, one 



