130 HETEROSTYLED DIMORPHIC PLANTS. Chap. III. 



for the grains from the projecting stamens of the short- 

 styled form, if smooth, would have been liable to be 

 blown away by the wind, and would thus have been 

 lost; but the little points on their surfaces cause them 

 to cohere, and at the same time favour their adhesion 

 to the hairy bodies of insects, which merely brush 

 against the anthers of these stamens whilst visiting 



Fig. 9. 



Short-styled form. Long-styled form. 



Outlines of flowers from dried specimens. Pollen- grains, magnified 



180 times, by Fritz Miiller. 



Fab a me a [sp. ?]. 



the flowers. On the other hand, the smooth grains 

 of the long-styled flowers are safely included within 

 the tube of the corolla, so that they cannot be blown 

 away, but are almost sure to adhere to the proboscis of 

 an entering insect, which is necessarily pressed close 

 against the enclosed anthers. 



It may be remembered that in the long-styled form 



