112 HETEROSTYLBD DIMORPHIC PLANTS. Chap. III. 



were thus legitimately fertilised. They produced 8 

 seeds, or 4 per flower-head. 



Four heads on short-styled plants similarly received 

 pollen from other short-styled plants, and were thus 



Fig. 7. 



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

 Some of the anthers have dehisced, others have not. 



Polygonum fagopyeum. (From H. MuUer.) 



illegitimately fertilised. They produced 9 seeds, or 2.25 

 per fiower-head. 



The result from fertilising the flower-heads in the 

 above imperfect manner cannot be fully trusted; but 

 I may state that the four legitimately fertilised flower- 

 heads yielded on an average 7.50 seeds per head; 

 whereas the seven illegitimately fertilised heads 

 yielded less than half the number, or on an average 

 only 3.28 seeds. The legitimately crossed seeds from 

 the long-styled flowers were finer than those from the 



