102 



NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 



mens of 0. cana from the crosses of 0. lata and 0. nanella must 

 evidently be considered as mutants, that is, as having arisen from 

 the fertilization of mutated sexual cells, since we have seen that 

 such mutations occur from time to time, especially among the 

 seeds of 0. lata. 



Table X. 



Crosses of 0. cana with 0. Lamarckiana and its mutants. 



Apart from the appearance of plants of the cana type, the results 

 of the crosses are, in every case, such as would be expected if 0. 

 Lamarckiana had been used instead of 0. cana. In this respect 

 they simply confirm the conclusions given in my book. 



Let us now consider in its detaiis the analogy of 0. cana with 

 the allied forms of 0. scintillans and 0. lata. Two cases offer 

 themselves for this consideration. The first one is afforded by 

 the crosses with 0. biennis. Apart from stray mutants, these produce 

 two types, one of which combines the visible marks of both parents, 

 whereas the other wholly lacks the characters of the mother, but 

 is simply like the hybrid of 0. Lamarckiana and 0. biennis, as 

 described in my book. In the first group the combination is such 

 as to make the characters of the mother the most striking in the 

 hybrids, whereas those of the father, 0. biennis, have only a less 

 influence on the general type. 



Table XI. 



0. cana x 0. biennis compared with 0. lata and 0. scintillans 



