48 



The Journal of Heredity 



Hguled. In 1916 the rows grown 

 adjacent to this selection of Garton 

 784 consisted of other pure Hne selec- 

 tions of the same variety. 



It was pointed out above that all 

 homozygous and heterogygous false 

 wild Garton 784 as well as cultivated 

 Garton 784 had black seeds and the 

 leaves were non-liguled. If false wild 

 oats arose in this instance because of 

 natural crossing between the Garton 

 784 selection and other cultivated 

 forms, segregation with respect to seed 

 color would be expected. Moreover, 

 segregation with respect to the ligule 

 character would also be expected 

 provided the natural cross was between 

 liguled and non-liguled forms. 



Natural crossing occasionally occurs 

 in oats as has been pointed out by 

 Tschermak (1901), Fruwirth (1909), 

 and Pridham (1916). A few years ago 

 Professor A. C. Arny of University 

 Farm, St. Paul, Minnesota, called the 



writer's attention to what apparently 

 was a natural cross between a fatua 

 and a sativa oat. The particular 

 individual plant row showed segrega- 

 tion typical of an F^ generation of a 

 fatua-sativa cross. It is possible that 

 once the mutation has occurred which 

 produces false wild oats, their further 

 dissemination is facilitated by natural 

 crossing. There is also the possibility 

 of confusing segregates of a fatua-sativa 

 natural cross with false wild oats as 

 described in this paper. 



Fruwith, C, 1909. 



CONCLUSION 



False wild oats were discovered in 

 three very different varieties of culti- 

 vated oats namely, Victory, Garton 

 784, and Aurora. In view of the 

 evidence presented the origin of these 

 aberrant forms may be attributed more 

 logically to mutations than to natural 

 crossing. 



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