Left: Trigger hair of Dionaea muscipula (Venus flytrap). Right: Enlarged view of mucilage-covered tip of Drosera capensis (Cape sundew). Each of these two different structures produces an electrical signal that triggers leaf movements, an apomorphy uniting Dionaea and Drosera with the Droseraceae.
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copyright: S. E. Williams, BSA
license: http://images.botany.org/index.html#license