112 HETEROSTYLED DIMORPHIC PLANTS. Chap. IlL 



pollen in the same manner from other long-styled 

 plants, and were thus illegitimately fertilised. They 

 produced 14 seeds, or only 4-66 per flower-head. 



Two flower-heads on short-styled plants receiyed 

 pollen in like manner from long-styled flowers, and 

 were thus legitimately fertilised. They produced 8 

 seeds, or 4 per flower-head. 



Fig. 7. 



Upper figure, the long-styled form ; lower figure, the short-styled. 

 Some of the anthers have dehisced, others have not. 



Polygonum fagopyrum. (From H. Muller.) 



Four heads on short-styled plants similarly received 

 pollen from other short-styled plants, and were thus 

 illegitimately fertilised. They produced 9 seeds, or 

 2 • 25 per flower-head. 



The results from fertilising the flower-heads in the 

 above imperfect manner cannot be fully trusted ; but 

 I may state that the four legitimately fertilised flower- 



