PLATE 19. 



2 1 



Oenothera paniflora. 1, seedling two months after germination; 2, leaf of young rosette; 

 3. stem-leaf; 4, bud and bract; 5, flower with petals removed; 6, flower and 

 bract; 7, petal; 8, capsule and full-grown bract (from seeds from Maine). 



