CHAP. V. HETEROSTYLED DIMORPHIC PLANTS. 215 



pear to have lost, though only in a very slight degree, 

 their full fertility. 



We will now turn to the short-styled form : from a 

 plant of this kind, fertilised with its own-form pollen, 

 I raised, during February 1862, eight seedlings, seven 

 of which were short-styled and one long-styled. They 

 grew slowly, and never attained to the full stature of 

 ordinary plants ; some of them flowered precociously, 

 and others late in the season. Four flowers on these 

 short-styled seedlings and four on the one long-styled 

 seedling were illegitimately fertilised with their own- 

 form pollen and produced only three capsules, con- 

 taining on an average 23 '6 seeds, with a maximum 

 of 29 ; but we cannot judge of their fertility from so 

 few capsules; and I have greater doubts about the 

 normal standard for this union than about any other ; 

 but I believe that rather above 25 seeds would be a 

 fair estimate. "Eight flowers on these same short-styled 

 plants, and the one long-styled illegitimate plant 

 were reciprocally and legitimately crossed ; they pro- 

 duced five capsules, which contained an average of 

 28 '6 seeds, with a maximum of 36. A reciprocal 

 cross between legitimate plants of the two forms 

 would have yielded an average of at least 57 seeds, 

 with a possible maximum of 74 seeds ; so that these 

 illegitimate plants were sterile when legitimately 

 crossed. 



I succeeded in raising from the above seven short- 

 styled illegitimate plants, fertilised with their own- 

 form pollen, only six plants grandchildren of the 

 first union. These, like their parents, were of low 

 stature, and had so poor a constitution that four died 

 before flowering. With ordinary plants it has been 

 a rare event with me to have more than a single plant 

 lie out of a large lot. The two grandchildren which 

 15 



