1924] 



Collms : Inheritance in Crepis capillaris (L.) Wallr. 



251 



VARIATIONS IN CREPIS CAPILLARIS 



Observations upon cultures grown from the achenes obtained from 

 localities in many different regions have resulted in the discovery 

 of a number of variations. Those which have been studied sufficiently 

 to show their method of inheritance are described below. In assign- 

 ing symbols to serve as genetic representatives of particular char- 

 acters, the system in general use has been followed, namely, the use 

 of the initial letter (or letters) of the name given to the character, 

 small letters indicating a recessive, and capital letters a dominant 

 condition. 



BALD (b) 



On AugiTSt 17, 1918, a single plant (I9.I8P03) in a culture of 47 

 plants gro\^^l from achenes sent from Copenhagen was found to be 

 devoid of glandular pubescence on the involucre and peduncle. This 

 variation has been named 'bald.' The second instance of this variation 

 was in the same race but appeared only after two generations of 

 inbreeding. Bald plants later appeared in cultures from other locali- 

 ties as follows: Sweden, England, France, Chile, and the Azores. It 

 was of importance to know whether the same or different genes were 

 responsible for the appearance of 'bald' in cultures from such widely 

 separated sources. This could be determined by crossing the different 

 races. If a single gene w^ere involved, then bald F^ plants should 

 result, while if, on the other hand, glandular plants resulted in the 

 Fj, this variation appearing in the different stocks would be the 

 similar expression of different genes. As is shown in table 1, the 

 same gene is present in each case. 



TABLE 1 

 The Fi Eesults of Crossing Different Geographical Eaces of Bald 



