I9IS-] 



PURE SPECIES OF OENOTHERA. 



237 



between these species grown by the writer in 19 13 gave data on 

 seed germination in the earth as presented in Table I. 



TABLE I. 

 Fj Hybrids of Reciprocal Crosses between O. biennis and O. muricata. 



It is probable from my experience with other species crosses 

 that the viability of the seeds of these F^^ hybrids is really high and 

 that the relatively low percentages recorded above are due to de- 



TABLE H. 



F, Hybrids of Reciprocal Crosses between O. biennis and O. muricata, In- 

 cluding Certain Double Reciprocals, Sesquireciprocals, and 

 Iterative Hybrids. 



layed germinations. But the figures for germination in the earth 

 of F, hybrids and of double reciprocals, sesquireciprocals, and iter- 



