NEW DIMORPHIC MUTANTS OF THE OENOTHERAS. 



101 



and afterwards give the necessary details concerning the several 

 cultures. 



The main purpose of these crosses was to decide the question 

 whether the special characters of 0. cana are handed down by the 

 ovules only, as in 0. scintillans and 0. lata, or by the pollen also. 

 Table IX gives the result of the crosses with wild species other 

 than Lamarckiana. Here a splitting occurs into laeta and velutina 

 or into densa and laxa, exactly analogous to that produced by 

 0. Lamarckiana itself. The only exception is the pollen of 0. biennis, 

 which does not split; it gives with 0. cana the same type as with 

 the parent species. The result was very striking on the beds. No 

 specimens of the cana type occurred in the cases where this mutant 

 had been the father, whereas such individuals abounded in the 

 results of the reciprocal crosses. 



Table IX. 



Crosses of 0. cana with other species. 



In this table, 0. syrticola Bartlett is the 0. muricata L. of my 

 Gruppenweise Artbildung, anclO. atrovirens Bartlett has been described 

 in that book as 0. cruciata Nutt. The other names are still the 

 same as in my book. 



With the same purpose crosses were made with 0. Lamarckiana 

 and some of its derivatives. 



The main result is the same. In all the crosses of both tables the 

 characters of 0. cana are handed down through the ovules to a large 

 part of the progeny, but not through the pollen. The behavior is 

 exactly the same as in 0. scintillans and 0. lata. The two speci- 



