It's a Utricularia, one of the Bladderworts. Mine (different species though) are only just starting to come out now, but they're growing 'wild'. They're fascinating little plants.
It's a U. Sandersonii. Easy grower. It took quite a while for it to take off for some reason. Maybe the cooler house temps during this winter is the reason. Room temp was 66 to 69 F.
More than likely, it was probably waiting for it to warm up a bit more.