2 54 



BOTANICAL GAZETTE 



[OCTOBER 



more slender than in 0. Lamar ckiana; the anthers are thin, provided 

 with a good supply of pollen on stout specimens, but often deficient 

 in this production on the weaker ones, especially in annual cultures. 



0. Lamqrckiana mut. cana. — ^Among the cana mutants from 

 0. Lamarckiana only one specimen has been self-fertilized. It 

 arose in 1913 in the fourth guarded generation from a plant intro- 

 duced into my garden in 1905 from the original field near Hilver- 

 sum. It was only recognized at the end of July, when it opened its 

 first flowers. It yielded few seeds, which gave rise to 19 seedlings 

 only, all of which flowered in 1914. Of these, 13 exactly dupHcated 

 the type of O. Lamarckiana, 5 were cana, and one was a mutant 

 nanella. These figures point to a percentage of 26 per cent cana. 



0. cana from lata no. i. — From the first mutant of 1906- 

 1907, previously described, I have derived a pedigree family in 

 order to try its constancy and got the following result: 

 1 906-1 907 Mutant Mutant 



191 2 Second generation 



16 per cent cana ^Lamarckiana 



igi3 Third generation 24-34 per cent cana Lamarckiana Lamarckiana 



The size of these cultures is given in table I. 



TABLE I 



The offspring of two cana individuals of the second generation 

 have been studied separately, as well as those of one specimen of 

 the Lamarckiana type. The plants have been under observation 

 through their whole lifetime, so far as space allowed, the nimibers 

 of the flowering individuals being given in the column next to that 

 of the totals. The cana were all of the same type; the Lamarckiana 

 exactly repeated the marks of the original species. Three of the 

 dwarfs have flowered. They all had the marks of ordinary 0. La- 



