It also seems that the pitcher plant mechanism is found in several different genus. In addition, there are also closing trap plants and just plain sticky dissolve it where it lands plants. The area of carnivorous plants is also one where we don't have a very complete historical record yet but since several different methods (and combination of methods) seem to cross genus I would guess that the differences go back quite a ways.
AbE:
If you get a chance, look at Bladderworts. They seem to incorporate many of the transitional features, a hair like trigger that causes a physical reaction in the plant and a fluid container where the actual dissolving and absorption happens.
Just remember I am old and the little I know was simply absorbed by hanging around biologists for a couple decades.
Edited by jar, : add bladderworts stuff
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