86 BOTANICAL GAZETTE [FEBRUARY 
O. pratincola, the mutations were brought to maturity and have 
yielded a second generation. This species, therefore, has been 
systematically examined for variations, with the results recorded 
in this paper. 
The Oenothera population at Lexington, Kentucky 
During a brief visit in October 1912, the writer was able to 
find only two species of Oenothera X Onagra at Lexington, Ky. They 
are both new and are referred to below under the names O. pratin- 
cola and O. numismatica. If any other species occur within two 
or three miles of the city, they must be very scarce. Of course, 
in October many plants were through blooming and not in such 
condition that any differences among them would show to the best 
advantage. Nevertheless, it is believed that no common species 
could have been overlooked. Nine seed collections were made | 
from individual plants, which showed as great a range of variation 
as possible. These plants, and the strains descended from them, 
have been designated by letters from A to I. Eight of the strains 
proved to be taxonomically identical and are referred to as O. 
pratincola. Lexington A, B, and C were collected in a pasture near 
Town Creek, 2 miles west of Lexington, where they grew within 
200-300 feet of each other. Lexington E, F, G, H, and I were 
collected at random in vacant lots and within a mile of the city on 
the west. Lexington D is the only strain of the 9 which is referred 
to O. numismatica. The parent plant grew by a roadside about 2 
miles east of Lexington. In addition to the seed collections, many 
rosettes were collected which flowered in Washington in 1913. 
Thirteen plants from the same general region as plants E to I 
proved on flowering to be typical O. pratincola, as were also 26 plants 
from the edge of a field near the reservoir east of the city. It thus 
appears that O. pratincola constitutes the bulk of the Oenothera 
population at Lexington. O. numismatica is much scarcer; it did 
not occur at all among the rosettes which were collected, and was 
seen in flower only east of Lexington. 
The salient characters of the two evening primroses obtained 
at Lexington are the following: 
