1.THE TROPICAL PITCHER PLANT
The main thing that distinguishes the tropical pitcher plant, genus Nepenthes, from other carnivorous vegetables is its scale, the "pitchers" of this plant can reach over a foot in height, ideal for capturing and digesting not only insects, but small lizards, amphibians, and even mammals. (The doomed animals are attracted by the plant's sweet scent, and once they fall into the pitcher digestion can take as long as two months!) There are about 150 Nepenthes species scattered around the eastern hemisphere; the pitchers of some are used as drinking cups by monkeys (which are too large to find themselves on the wrong end of the food chain).
2.THE COBRA LILY
So named because it looks like a cobra about to strike, the cobra lily, Darlingtonia californica, is a rare plant native to the cold-water bogs of Oregon and northern California. This plant is truly diabolical: not only does it lure insects into its pitcher with its sweet smell, but its closed pitchers have numerous, see-through false exits that exhaust its desperate victims as they try to escape. Oddly enough, naturalists have yet to identify the natural pollinator of the cobra lily; clearly, some type of insect gathers this flower's pollen and lives to see another day, but it's unknown precisely which.
3.THE TRIGGER PLANT
Despite its aggressive-sounding name, it's unclear if the trigger plant (genus Stylidium) is genuinely carnivorous, or simply trying to protect itself from pesky insects. Some species of trigger plants are equipped with trichomes, or sticky hairs, which capture small bugs that have nothing to do with the pollination process and the leaves of these plants secrete digestive enzymes that slowly dissolve their unfortunate victims. Pending further research, though, we don't know if trigger plants actually derive any nutrition from their small, wriggling prey, or are simply dispensing with unwanted visitors.
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