1915] BARTLETT—MUTATION IN OENOTHERA gI 
lings of Lexington A, B, and E; one (no. 7) was of a darker green 
color than the type, the leaves were somewhat narrower, and the 
petiole and midrib below the middle of the blade were particularly 
broad and white; two (nos. 1 and 2) had almost orbicular leaves, 
and constituted the most striking deviation from the expected form 
4.—F, progeny of Oenothera pratincola, Lexington C: the same plants 
older 
Fic, 
shown in fig. 3, but a month 
that the writer had ever observed in a seedling of Oenothera. In 
fig. 3 the two upper plants are the round-leaved variations, nos. 
I wd 2; the two lower are typical O. pratincola, nos. 3 and 4. In 
fig. 4 the same 4 plants are shown when a month older. The reader 
will observe that the orbicular seedling leaves of nos. 1 and 2 have 
