ON THE VARIATIONS OF THE EVENING PRIMROSE 357" 





a. 



B. 



e. 



D. 



19. 



15 



7 



8 



22 



20. 



15 



6 



9 



20 



21. 



15 



5 



8 



20 



22. 



15 



4 



9 



20 



23. 



14 



11 



10 



20 



24. 



14 



7 



9 



24 



25. 



14 



6 



9 



22 



2(5. 



14 



6 



9 



19 



27. 



14 



6 



8 



18 



28. 



14 



5 



■ 9 



22 



29. 



14 



3 



10 



20 



30. 



13 



8 



9 



20 



31. 



13 



7 



9 



20 



32. 



13 



5 



i) 



20 



33. 



13 







7 



20 



34. 



12 



3 



7 



20 



35. 



10 



3 



7 



17 



Length of petal, b. L 



ength of at' 



y\e (projecting fi 



A. 



c. Length of filament, d. Length of tube in millimetres. 



These examples have been picked from different plants and 

 mostly at random. It cannot be said that the variation is dis- 

 continuous. 



The great variation in the length of the pistil appears in buds 

 on the point of opening, which either show nothing of the stigma, 

 or show a greater or less part projecting beyond the petals. In 

 one case the stigma projected 4 millim. out of a bud the petals of 

 which measured 15 (diameter of conical part of bud 6, length of 



ovary 



Mr 



samples of four plants growing wild near London. The first, from 

 Uxbridge, may be referred to the var. Lamarckiana, the fully open 

 flower showing the following measurements :— 



44 26 19 44 



One of the buds, ready to open, shows the stigma projecting 

 beyond the petals ; whilst another, in the same condition, lias the 

 stigma completely enveloped by the petals. 



The second, from Acton, resembles the typical CE. biennis as 

 growing in England, but the pistil is much longer, so that the 

 flower would fall under the definition of the Lamarckiana group 



of De Vries : — 



19 16 11 20 



The leaves are very smooth, with pale pink midribs. 



The third and fourth, from a brickfield between Acton and 

 Willesden (collected by Mr. A. Ley dell), I also regard as typical 

 CE. biennis ; their flowers gave the following measurements 



21 11 11 27 



22 13 13 27 



There is no pink in the leaves. 



The typical CE. biennis, as growing wild in and around 

 London, is generally characterized by its long flower-spike with 



