Drosera, Dionaea, Aldrovanda, Nepenthes, Drosophyllum, and Triphyophyllum are all closely related.
The closest relatives of Nepenthes are sticky-leaved carnivores and plants that evolved to become non-carnivores.
The Drosera phylogeny goes so far back in the dim past that we cannot tell how they diverged from their closest relatives.
Drosera has a type of chromosome that is very uncommon in nature. That plus the usual suspects of chromosomal dynamics helped create this very diverse genus.
Drosera hybrids happen in the wild and contribute to the evolution of new species.
Many Drosera species kill their own pollen if it lands on their stigma. This is actually quite common among flowering plants.
In the Lamiales there is a progression of trap types from sticky traps to the most complicated of carnivore traps.
The Utricularia phylogeny shows the itinerary a world traveller.
The next time you eat a kiwi fruit, you will be eating the fruit of a close relative of the Ericales carnivores.
Cephalotus is the only species in its family. It's closest relative is Oxalis.
Fanciful phylogeny from 1986.