218 



The Pedigree Fain Hies. 



niarckiana was introduced from America into our gar- 

 dens, from which it has subsequently escaped. At any 

 rate this was the case in the locahty in which I found it. 

 This was close to Hilversum and afforded peculiarly 

 favorable circumstances for the most minute investiga- 

 tion. I visited the place during the summers of the years 

 1886-1888 almost every week, and, since that date at least 

 once or twice nearly every year. The plant grev.' in a 



Fig. 42. Oenothera Lamarckiana. A flower nearly natural 

 size. One of the petals has been removed to show the 

 eight stamens with the pistil and its stigma. 



disused potato-field to wdiich it had spread from a neigh- 

 boring park. It began to spread in about the year 1875. 

 and during the 10 years 1875-1885 it extended over about 

 half the field. In the succeeding years it multiplied still 



rOenothera Lamarckiana dans les Pays-Bas, in Nedcrlandsch Kruid- 

 kundig Archief, T. VI, 4, 1895 ; also the later sections of this Part. 



