4 



BOTANICAL GAZETTE 



[JANUARY 



deeper yellow. The stigm 

 open early in the bud. T] 



surrounded by the anthers which 



velutina 



from 



the European O. biennis, although the leaves are narrower and darker 



I cultivated this strain during three succeeding generations. 



green 



mutant 



Mutations 



from 



iana seed of 1889 which was sown in 1895. In 1906 I had the fourth 



from 



cross. 



periments 



article arose as a mutant in 1901. It was artificially fertilized. My 



crosses were made with specimens of the 



of its progeny. 



I will now describe the crosses from 

 Oenothera scintillans X strigosa. 



made in July 



specimens. It yielded a small lot of seed 



which was sown the next spring. From 



most 



during the summer. The laeta and velutina agreed with the descrip- 

 tion given above; the lata was a mutant. The scintillans were inter- 

 hybrids, which had the habit and leaves of the mother 



mediate hybrids, which had 



parent, or nearly so, but small flowers with the anthers surrounding 



stigm 



I fertilized all three forms 



with their own pollen and intend to sow the seed next year. 



Oenothera lata X strigosa.— This cross was effected in 1905, both 

 parents being annual specimens. I used different plants of lata and 

 sowed the seed of one cross in 1906, of another cross in 1907, and a 

 third lot in 1908. I got the following results: 



Year 



Number of 

 specimens 



1906 



!907 



1908 



Total 



41 



47 



270 



358 



Percentage laeta 



36 



49 

 27 



Percentage 

 velutina 



59 

 40 



34 



Percentage lata 



5 

 11 



38 



40 



33 



27 



Lamarck iana. I 



from 



from 



1 



most 



