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MUTATIONS OF OENOTHERA SUAVEOLENS OESF. 



From the mutant of 1914 I had a second generation of two identical 

 specimens in 1915, but they yielded no fertile seeds after self- 

 fertilization. 



Crosses of Oe. suaveolens with its nearest allies 



With the exception of Oe. Lamarckiana and Oe. grandiflora, the 

 species of Onagra, when crossed with one another, give, as a rule, 

 uniform and constant hybrids. For this reason I have made some 

 crosses of Oe. suaveolens, in order to ascertain whether this species 

 would behave in the same manner. The result was, that more or 

 less clearly intermediate hybrids were obtained, which gave a uni- 

 form progeny in the second generation, as far as investigated. 



I shall limit myself here to the crosses with Oe. biennis L., Oe. 

 syrticola Bartl., which is the Oe. muricata L. of my book on "Grup- 

 penweise Artbildung" and Oe. biennis Chicago, a form described 

 in that book, very different in all respects from the Oe. biennis of 

 Linnaeus. 



The following crosses were studied: 



Besides these I studied two double reciprocal crosses, viz.: 



As already indicated the main result was that these hybrids 

 were uniform and constant in their progeny. No lutescens and no 

 other deviating forms occurred among them with the exception of 

 some specimens of Oe. lutescens in Oe. suaveolens x biennis, to be 

 described below. 



Oe. biennis L. x suaveolens. — This hybrid has been described 



