312 
DARWINISM 
CHAP. 
(2) Some flowers have irritable stamens which, when their 
bases are touched by an insect, spring up and dust it with 
pollen. This occurs in our common berberry. 
Long-styled form. M id-styled form. Short-styled form. 
Fm. 29. — Lythrum salicaria (Purple loosestrife). 
