iQisl BARTLETT— MUTATION IN OENOTHERA 119 



of mistaking mut. nummitlaria for the parent t^-pe or for one of the 

 other mutations is negligible. The orbicular seedling leaves are 

 too striking a characteristic to be overlooked. 



~ /Ocrt 



Fig. 15. — F3 progeny of Lexington C, Oenothera pratincola (pan 6 of the pro;;eny 

 of C-91); one plant of mut. nummularia is sliown, C-91-4; the other plants are ty[iical. 



The unlikeness of mut. nummularia and O. pratincola X O. 

 numismatica 



Before mut. nummularia had been found in F^ progenies from 

 guarded seed, it seemed possible that it might be an Fi hybrid of 

 0. pratincola with some other wild species, of which a few pollen 



