1909] 



DE VRIES— TRIPLE HYBRIDS 



7 



specimens 



acters. 



The lata specimens also were cultivated from seed of 1906 in both 



succeeding years. Their flowers were as large as those of both 



parents and intermediate in the tinge of the yellow, the Hookeri 



being paler yellow than the Lamarckiana and its lata. The anthers 



did not reach the stigma, which was often hand-shaped. The spike 



was much denser than that of Hookeri but thinner than that of the 



mother. Stem, veins, and calyx were reddish; and leaves were 



narrower than in O. lata. In all these and in other characters the 



plants were strikingly lata, but with the addition of the differentiating 



marks of the Hookeri. 



The self-fertilized seed of the lata plants of the first generation 

 gave a mixed progeny, consisting of velutina and lata, both resembling 

 the types of the first year. No laeta specimens were produced. 

 numbers were the following : 



The 



Year 



J 9°7 



1908 , 



Total 



Number of 

 seedlings 



53 

 134 



Percentage 

 velutina 



85 

 81 



Percentage 

 lata 



is 



19 



187 



82 



18 



From the experiments described the following table may be 



compiled : 



Triple hybrids and their succeeding generations 



Mother 



Father 



First generation 

 Percentage 



O. scintillansXO. strigosa 



O. lata 



XO. strigosa 



O. lata 



XO. bien. Chicago 



O. lata 



XO. Hookeri 



49 

 29 



21 



40 



33 

 27 



35 

 34 



3 1 



47 

 42 



laeta 



velutina 



scintillans 



laeta 

 velutina 



lata 



laeta 



velutina 



lata 



laeta 



velutina 



Second 

 generation 



Third 

 generation 



80 laeta 

 158 velutina 



11 lata 



j 70 laeta 

 196 velutina 90 velutina 



208 laeta 



120 velutina 

 82 per cent, 

 velutina 

 18 per cent, 

 lata 



< 



