486 On the Latent Capacity for Mutation. 



curred, forming structures which looked hke fine double 

 flowers. 



A leaf was sometimes fused longitudinally with the 

 stem, with the result that that part of the stem, to which 

 the leaf was attached, was checked in its growth and bent 

 in a most remarkable fashion. I observed a case of the 

 concrescence of an axillary shoot with the main stem 

 in 1899. 





Fig. 1 10. Oenothera ruhrinervis. A flower with two bracts; 

 the lower one, the larger of the two, on the fruit pedicel, 

 the upper on the fruit itself. The bract, in the axil of 

 which the flower arose, is not shown. 



Rarer partial variations in the flowers. A leafed and 

 stalked fruit occurred in the tricotylous culture of the 

 O, riibrinervis-isimily (Fig. 110). The stalk was 7 milli- 

 meters long and bore a leaf (a) whose median axis coin- 

 cided with that of the bract in whose axil the flower 

 arose. This leaf, which was situated on the side of the 

 main bract was 7 cm. long and 1.5 cm. broad. The 



