— 122 — 



Numerous intermediate forms occur between those two 

 extreme forms. — In the $ flowers the style is long, the 

 stamens are short, the anthers occur in the same shape as 

 in the ? flowers, but they do not dehisce, and get rotten 

 (the base of the anthers gets rotten first, then the upper 

 part) Both forms of flowers bear fruit. — Visitors are 

 Mcdachius (pollen eating and trying to suck), a small bee 

 (sucking) and Forficula (devouring the anthers). 



Convolvulus arvensis, L. In the downs in Blanken- 

 berghe we observed 4 different forms of flowers of this 

 plant : 1° The ordinary form so as it was described by 

 Hermann Muller. — 2° A form with large flowers 

 (35 mm. in diameter). Around the yellowish central part 

 of the flower is marked a broad red streak ; the corolla is 

 elsewhere pale pink. Those colours are most lovely. — 

 3° A form with smaller flowers (25 mm. in diameter) the 

 same colours as in the latter form. The base of the erect- 

 standing part of each stamen is beset with two curved 

 appendages (fig. 3) (one of them can be very small, 

 sometimes wholly fail). May be that these appendages are 

 pollen-collecting organs, or help to make the honey more 

 inaccessible. In the ordinary form the small stiff" projec- 

 tions, which beset the edges of the filaments of the 

 stamens, stop the slits between them ; in this form those 

 projection s are much reduced, and the filaments, which 

 have got a little twisted, stop the slits. — No visitors 

 seen. — 4° A form agreeing with the ordinary form, but 

 female : the stamens are short ; the anthers get rotten (in 

 the same way as in the female form of C. Soldanelld). 



Cirsium arvense Scop. Gynodioeceous, in Blankeü- 

 berghe and Ghent. 



Cirsium lanceolatum, Scop. Gynodioeceous in Rlan- 

 kenberghe. 



