I9I5] 



BARTLETT— MUTATION IN OENOTHERA 



Fig. 2. — Oenothera nnmismalica, sp. nov.: upper part of main stem of Lexington 

 D-29; leaves from middle of stem; lateral branches from just below the terminal 

 spilie; characteristic foliage of such a lateral branch; in contrast with fig. i, note 

 the denser shorter spikes, which are only in flower a short time, the much closer 

 branching, and the characteristic suborbicular leaves of tlie uppermost lateral 

 branches; XJ. 



