64 Heterostylism in Oxalis 



Longs by Shorts or Shorts by Longs, with the exception of the one 

 case already noted, give only Longs and Shorts in a total offspring 

 of 322. 



Mids by Shorts and Shorts by Mids throw all three forms in 

 numbers not explicable at present. 



There is no case of the third non-parental type occurring occa- 

 sionally as in Oxalis. 



The self-fertilizations have mostly failed, chiefly owing to the 

 lateness of the season when they were attempted. 



Parents 



Darwin's numbers for self- and illegitimate-fertilizations are added. 



Parents 

 Female Male Longs Mids Shorts 



There seems little doubt that in Lythrum and in Oxalis, as in the 

 dimorphic Primula, the Long-styled form is the recessive, and can only 

 give Longs. 



1. Reciprocals have always given like results. That is, there is no 

 evidence that the (/ and $ gametes carry different characters. 



2. Long-styled plants selfed give Longs only. Long is the pure 

 recessive, as in Primula. 



3. There are certainly two differently constituted Mid-styled 

 Oxalis, giving different ratios with the same Short. One gives no 

 Longs at all, and the other gives Longs in equality with the Mids. 

 Self-fertilizations can give Longs as well as Mids, and once in Oxalis 

 all three forms have appeared. There is no comparative evidence 

 on the result of self-fertilizing the two different types of Mid-styled 

 plant. 



