

20 



HETEROSTYLED DIMORPHIC PLANTS. Chap. I. 



planted during the previous autumn into a large bed 

 in my garden, and all were treated alike; the result 

 was: 





Table 3. 









Number 



of 

 Plants. 



Number 



of 

 Umbels. 



Weight 



of Seed in 



^ 



grains. 



Short-styled cowslips . . 

 Long-styled cowslips . . 



47 



58 



173 



208 



745 

 692 



These figures give us the following proportions: 







Table 4. 





Number 



of 

 Plants. 



Weight of 



Seed in 



grains. 



Number 



of 

 Umbels. 



Weight 

 of Seed in 





grains. 





100 

 100 



1585 

 1093 



100 

 100 



430 

 332 



The season was much more favourable this year than 

 the last; the plants also now grew in good soil, instead 

 of in a shady wood, or struggling with other plants in 

 the open field; consequently, the actual produce of 

 seed was considerably larger. Nevertheless we have 

 the same relative result; for the short-styled plants 

 produced more seed than the long-styled in- nearly the 

 proportion of three to two; but if we take the fairest 

 standard of comparison, namely, the product of seeds 

 from an equal number of umbels, the excess is, as in 

 the former case, nearly as four to three. 



Looking to these trials made during two successive 

 years on a large number of plants, we may safely con- 

 clude that the short-styled form is more productive 

 than the long-styled form, and the same result holds 

 good with some other species of Primula. Consequently 

























