154 HETEROSTYLED TRIMORPHIC PLANTS. CHAP. IV. 



This gives an average of 21 5 seeds per capsule. As 

 we know that the long-styled form, when standing 

 near plants of the other two forms and fertilised by 

 insects, produces on an average 93 seeds per capsule, 

 we see that this form, fertilised by its own two pollens, 

 yields only between one-fourth and one-fifth of the full 

 number of seed. I have spoken as if the plant had re- 

 ceived both its own kinds of pollen, and this is, of 

 course, possible ; but, from the enclosed position of the 

 shortest stamens, it is much more probable that the 

 stigma received exclusively pollen from the mid- 

 length stamens; and this, as may be seen in com- 

 partment V. in Table 23, is the more fertile of the two 

 self-unions. 



TABLE 24. Mid-styled Form. 



Legitimate union. 



12 flowers fertilised by the mid- 

 length stamens of the long-styled. 

 These stamens equal in length the 

 pistil of the mid-styled. 



Product of good seed in each cap- 

 sule. 



133 122 



149 50 



147 151 



109 119 



133 138 



144 



92 per cent, of the flowers (pro- 

 bably 100 per cent.) yielded cap- 

 sules. Each capsule contained, on 

 an average, 127 -3 seeds. 



II. 

 Legitimate union. 



12 flowers fertilised by the mid- 

 length stamens of the short-styled. 

 These stamens equal in length the 

 pistil of the mid-styled. 



Product of good seed in each cap- 

 sule. 



112 109 



130 143 



143 124 



100 145 



33 12 



141 



104 



100 per cent, of the flowers yielded 

 capsules. Each capsule contained, 

 on an average, 108'0 seeds; or, ex- 

 cluding capsules with less than 20 

 seed?, the average is 116*7 seeds. 



