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BARTLETT— MUTATION IN OENOTHERA 



91 



lings of Lexington A, B, and E; one (no. 7) was of a darker green 

 color than the type, the leaves -^vere somewhat narrower, and the 

 petiole and midrib below the middle of the blade were particularly 

 broad and white; two (nos. i and 2) had almost orbicular leaves, 

 and constituted the most striking deviation from the expected form 



Fig. 4. — Ft progeny of Oenothera pralincola, Lexington C: the same plants 

 shown in fig. 3, but a month older. 



that the writer had ever observed in a seedling of Oenothera. In 

 tig. 3 the two upper plants are the round-leaved variations, nos. 

 I and 2; the two lower are typical 0. pratincola, nos. 3 and 4. In 

 tig. 4 the same 4 plants are shown when a month older. The reader 

 will observe that the orbicular seedling leaves of nos. i and 2 have 



