1920] 



Babcock-ColUns : Crepis capillaris X C. tectorum 



193 



Z 3 Fi (18.42 Poi X p2 P51) capillaris X tectorum 



Three heads from which pollen had been washed with a jet of water 

 were then pollinated with tectorum pollen and covered with a bag. 

 These heads prodnced forty-two achenes which were smaller even than 

 the average capillaris achenes. Of twenty-four placed in the germi- 

 nator, thirteen sprouted and the twelve surviving divided themselves 

 in the cotyledon stage into three groups. Six appeared like tectorum 

 seedlings, five like capillaris, and one was intermediate. These all died 

 at the end of the cotyledon stage. 



Z 5 Fi (18.58 P^ X p2 Pio) capillaris X tectorum 

 Achenes from this cross were planted at two different times. 



Of 



the four placed first in the germinator, only two sprouted, both having 

 large ^ec^ontm-like cotyledons. The plumule leaves started on one 



