OENOTHERA MUTANTS WITH DIMINUTIVE CHROMOSOMES 50/ 
cone directly beneath, the petals are pushed into a sort of trough 
(whose convexity must appear upon the stigma surface of the petals) 
extending in the same direction as the line marking the union of two 
neighboring sepals. 
Markings of this sort, though less pronounced and often more 
irregular in appearance, are found in the newly-opened flowers of 
many forms, but they usually disappear shortly after the petals are 
Fig. 2. 0. plicatula; flower taken from plant shown in Text-fig. i. Photo- 
graphed September 19, 6:40 A. M., 1909. Showing "crimped" petals. 
released. The crimps or ridges in the petals of 0. plicatula persisted 
as shown in text figure 2 until the flowers faded. The flowers shown in 
text figures 2 and 3 were photographed in the early morning of the 
same day. 
While 0. plicatula could not be mistaken for 0. rubrinervis under 
any circumstances, a type grown at Cold Spring Harbor which 
may have been identical with de Vries's rubrinervis, had crimped petals 
