A wet site:
This luxuriant clump of plants is a
little atypical. Venus Flytraps grow in conditions that are much
dryer than most carnivorous plant horticulturists would believe.
However, this clump of plants was growing in a very wet site, with
sprigs of wet Sphagnum here and there.
The expanded petioles on these plants
were much wider and leafier than usual. (I can't write that sentence
without editorializing--don't forget that the part of the leaf
on Venus Flytraps commonly called the
"petiole" is really an expanded leaf base...) Take a closer look.