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Which four carnivorous plant families are closely related within Caryophyllales?

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Caryophyllales Pink carnation flowers (*Dianthus caryophyllus*).

Within the order Caryophyllales, the four closely related carnivorous plant families are:

Dioncophyllaceae
Drosophyllaceae
Droseraceae
Nepenthaceae

These families are considered closely related, suggesting a single evolutionary origin of carnivory within the order. Despite this shared ancestry, they have developed a diverse array of insect-capture mechanisms, such as pitfall or pitcher traps and various forms of sticky flypaper traps.1