12 ' BOTANICAL GAZETTE [january 



second, from 



indi 



viduals of all these crosses reached, in September, a height of more 



m 



of their evolution, like the velutina of the controlling cross. 



O. blandinaXO. Cockerelli. — Seeds of only one cross of 1913 

 were tried, both parents being annuals. One part was sown in 

 1914, another in 191 5; size of the cultures, 60+80= 140 specimens, 

 of which 25 and 21 flowered. One of the latter was the lata mutant 

 previously mentioned. In June 19 14, there was not the least doubt 

 concerning the identity of all the 60 specimens with O. (canaX 

 Cockerelli) velutina, but in 19 15 those young plants which had not 

 been planted out in order to flower were a little too crowded. 

 I therefore pulled out those which were indubitably velutina, and 

 planted all the dubious ones on a separate bed, giving them just 

 as much space as in ordinary cultures. About one-half of these 

 (11 plants) flowered in September, but all of them displayed, at 

 that time, the characters of 0. (Lamar ckianaXCockerelli) velutina, 

 so as to leave no room for doubt. No laeta has appeared among 

 the offspring of this cross. 



0. HookeriXO. blandina. — Only one Hookeri was crossed in 

 1 9 13 with one specimen of blandina of my race. The seeds gave 

 60 offspring in 1914 and 85 in 191 5, of which 25 and 10 flowered. 

 In the crosses of O. Lamarckiana and its derivatives with this 

 Californian species, the velutina have almost the features of 0. 

 Hookeri itself, showing only a small influence of the other parent. 

 I compared my hybrids in both years with first generation hybrids, 

 using for the comparison both the reciprocal crosses of O. cana of 

 1913 in one year and the hybrids of a cross 0. HookeriX Lamarck- 

 iana of 1909 in the next year. Although the specimens, which were 

 not allowed to flower, made stems of only a few centimeters, or 



0. Hookeri was strongly pronounced in them. All of them 

 long narrow leaves of velutina , and no laeta occurred in tl 

 culture of 145 plants. 



Resuming these details, we see that 565 hybrids of O. i 

 with splitting species have been studied, and that all of th 



type of 



the 



crosses of 0. Lamarckiana and of 0. cana. 



t 



