1915] BARTLETT—MUTATION IN OENOTHERA 89 
FIG. 2.—Oenothera numismatica, sp. nov.: upper part of main stem of Lexington 
D-29; leaves from middle of stem; lateral branches from just below the terminal 
spike; characteristic foliage of such a lateral branch; in contrast with fig. 1, note 
the denser shorter spikes, which are only in flower a short time, the much closer 
branching, and the characteristic suborbicular leaves of the uppermost lateral 
branches; x 
cole 
