I 



92 HETEROSTYLED DIMORPHIC PLANTS. Chap. III. 



the eight good capsules contained on an average 8 good 

 seeds each. Judging from the number of seeds per 

 capsule, the fertility of the two legitimate to that of 

 the two illegitimate unions is as 100 to 20. 



The numerous flowers on the eleven long-styled 

 plants under the net, which were not fertilised, produced 

 only three capsules, including 8, 4, and 1 good seeds. 

 Whether these three capsules were the product of acci- 

 dental legitimate fertilisation, owing to the branches 

 of the plants of the two forms interlocking, I will not 

 pretend to decide. The single long-styled plant which 

 was left uncovered, and grew close by the uncovered 

 short-styled plant, produced five good pods; but it was 

 a poor and small plant. 



The flowers borne on the thirteen short-styled plants 

 under the net, which were not fertilised, produced 

 twelve capsules, containing on an average 5.6 seeds. 

 As some of these capsules were very fine, and as five 

 were borne on one twig, I suspect that some minute 

 insect had accidentally got under the net and had 

 brought pollen from the other form to the flowers which 

 produced this little group of capsules. The one un- 

 covered short-styled plant which grew close to the un- 

 covered long-styled plant yielded twelve capsules. 



From these facts we have some reason to believe, as 

 in the case of L. grandiflorum, that the short-styled 

 plants are in a slight degree more fertile with their 

 own pollen than are the long-styled plants. Anyhow 

 we have the clearest evidence that the stigmas of each 

 form require for full fertility that pollen from the sta- 

 mens of corresponding height belonging to the opposite 

 form should be brought to them. 



Hildebrand, in the paper lately referred to, confirms 

 my results. He placed a short-styled plant in his 

 house, and fertilised about 20 flowers with their own 





