Fig. 15. Lamarckiana. 



Fig. 17. Lamarckiana. 



Fig. 19. Oblonga. 



Fig. 16. Gigas. 



Fig. 18. Gigas. 





Fig. '20. Lata. 



Oenothera Lamarckiana and Some of its Mutants 



Fig. 15, late in season; 16, at mid-season; 17-20, in rosette stage (wintering-over stage). 



From cultures and photographs by Professor B. M. Davis. 



