There are currently about seven hundred described "truly
carnivorous" plants, with about 250 others speculated of carnivory
or near carnivory.
There are flypaper traps (sundews, drosophyllum, byblis,
triphyophyllum, pinguicula, ibicella lutea, etc.) which trap their
prey through sticky mucilage. Several hundred species belong to
this category.
Snap traps, (aldrovanda, dionaea, utricularia) trap their prey
through bladders or folding leaves. This comprises of about 227
species.
Passive traps makes up the ramainder. This includes catopsis,
brocchinia, sarracenia, cephalotus, heliamphora, nepenthes,
darlingtonia, and genlisea.
Over all, about 18 genus.