86 BOTANICAL GAZETTE [febeuary 



0. 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 OenotheraX Onagra at Lexington, Ky . They 

 are both new and are referred to below under the names 0. pratin- 

 cola and 0. 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 befet 

 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 0. 

 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 0. 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 19 13. 

 Thirteen plants from the same general region as plants E to I 

 proved on flowering to be typical 0. 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. 0. 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 : 



