the final carnivore with a pitfall-like trap is the bromeliad "brocchinia reducta". like most relatives of the pineapple, the tightly packed, waxy leaf bases of the strap-like leaves of this species form an urn. in most bromeliads, water collects readily in this urn and may provide habitats for frogs, insects and, more useful for the plant, diazotrophic (nitrogen-fixing) bacteria. in "brocchinia", the urn is a specialised insect trap, with a loose, waxy lining and a population of digestive bacteria.