446 The Systematic Value of the New Species. 



young buds. On the other hand it faciHtates self-fertili- 

 zation by rendering it superfluous to do more than exclude 

 the visits of insects. A very different state of things 

 obtains in Oen. Lamarckiana. Here castration can be 

 easily and safely effected even in large buds ; but in self- 

 fertilization the pollen has to be actually transferred. In 

 this respect all the new species except 0. lata and O. 



Fig- 99- Ripe fruits shortly before drying, half natural size. 

 L, Oenothera Lamarckiana; R, O. rubrinervis ; A, O. albida. 



hrevistylis and the sterile forms behave exactly like 0. 

 Lamarckiana and not like O. biennis. The necessity of 

 fertilizing, year after year, with my own hand every 

 single flower from which I wanted to save seed has 

 given me sufficient experience on this point. 



In the description of the species (§§ 10-23) I made 

 occasional reference to atavistic phenomena. For ex- 



