Page:Darwinism by Alfred Wallace 1889.djvu/334

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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.

FIG. 29.—Lythrum salicaria (Purple loosestrife).
FIG. 29.—Lythrum salicaria (Purple loosestrife).