Fici. 15. Lamarckiana. 



Fli.. 17. Lamarrkiana. 



Fig. 19. Oblonga. 



Fig. 16. Gigas 



Fig. 18. Gigas. 



Fig. 20. Lata. 



Oenothera L.\MABCKrANA ksd Some of its Mutants 



Fig. 15, late in .scitson; 10, at niicl-sfii.son; n-iO, in rosette stage (winteriug-over stage). 



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



