STERILITIES OF WILD AND CULTIVATED POTATOES. 



25 



bilities and cross-incompatibilities in this strain of Solanum chacoense. 

 (See PL Vm, fig. 2.) 



Table 5. — ResuUsof hand pollinations in Solanum fendleri, all sel/ed, in 1921 and 1922. 



Of the 24 plants of Solanum fendleri grown from seed and listed in 

 Table 5, all but two produced seed balls to controlled self-pollinations. 

 For the two plants that failed only 1 and 2 flowers, respectively, were 

 selfed, so the failures for this may be due to experimental error. It 

 appears that this strain of S. fendleri is highly if not completely 

 sell-compatible. 



Table 6. — Results of hand ■pollinations in Solanum jamesii, in 1921 and 1922. 



Selfed. 



Crosses Between Different Plants Within the Species. 



> One small seed ball started to develop, but fell oft when about one-eighth of an inch in diameter. It 

 contained no seeds. Later in the season this plant produced normally developed seed balls, both 

 naturally fertilized and inbred, under paper sacks. 



