Oenothera Ohlonga. 347 



them to differ from the other mutants in the matter of 

 constancy. I will describe the ancestry of the three plants 

 separately. 



The first arose from the laevifolia-i^xmly, whose 

 pedigree has been given on p. 273, in the following way : 



1895-1896 O. oblonga 



I 

 1894 O. rubrinervis 



I 

 1893 O. rubrinervis y 5th gen., X O. natiella, 4th gen. 



Similar intermediate 

 generations 



1889 O. rubrinervis O. fianella 



1888 O. Lamarckiafia 



I 

 1886-1887 O. laevifolia from Hilversum 



The first three generations in this pedigree as well 

 as the rubrinervis of 1893 have already been referred 

 to on p. 273. The 0. nanella w^as biennial in 1889, but 

 since then has been annual. In the summer of 1893 I 

 pollinated some castrated flowers of O. rubrinervis with 

 the pollen of 0. nanella; in 1894 I obtained from these 

 seeds some ordinary rubrinervis plants, which were fer- 

 tilized with their own pollen and produced mainly O. 

 rubrinervis. But amongst them were four oblonga (p. 

 341 ) of which I managed to bring one safely through the 

 winter as a rosette. It flowered in 1896 in a parchment 

 bag; 16 seedlings were raised from it and were subse- 

 quently transplanted into pots ; they were all oblonga. 



The second oblong a-muidLni arose likewise from the 

 laevifolia-fsimWy. It arose from a self- fertilized La- 

 marckiana plant, in the main line of descent in 1894, a 

 plant which had itself therefore arisen partly from laevi- 

 folia and partly from Lamarckiana stock, but which, at 



