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THE AMEBIC AN NATURALIST [Vol. XLIX 



Fig. 9. Branches of mut. deUUs {left; No. 89-3-21-1) and mut. Ulonga 

 (right; No. 89-3-21-85) showing aissimiiarity in both foliage and fruits. The 



longest fruits in the subgenus Onagra. Exceptional fruits 

 are 70 mm. long ; the average length of six hand-pollinated 

 fruits was 62 mm. By way of comparison, it may be 

 stated that the length of the average fruit of f. typica is 

 about 33 mm., and that the longest is 38 mm. None of 

 the immediate allies of (Enothera biennis have longer 

 fruits than those of 0. Reynoldsii f. typica, although 

 there are allies of 0. muricata in which the fruits average 

 as long or longer. There is no species, however, in which 

 the fruit length of mut. bilonga is even approached. Here 

 we have an apparent case of progressive mutation, which 

 will be tested out as soon as possible. Mut. bilonga has 

 not thus far been carried into a second generation. Both 

 it and the two other dwarfs are completely self-fertile, 



