Thanks to a new friend for showing me this plant growing in northern NJ. Here goes the Droseraceae (Sundews, Venus Fly Trap, Aldrovanda) The first one is Aldrovanda vesiculosa (Waterwheel Plant). This is a fully aquatic, monotypic genus. The weird thing is how much this plant looks like Utricularia (Bladderworts). This is an Old World plant that I was shown at a site in northern New Jersey. Seems that folks have spread this one around pretty good. You can see in the first pic how it resembles Utricularia. The second pic gives you an idea of the trap, which is submerged, as the whole plant (except the flower) is aquatic. These traps are similar in function to the closely related Venus Fly Trap and may get about the size of your pinky nail. The Utrics trap is also aquatic but functions like a vacuum sucking prey in rather than a snap trap.
Thanks Rich, wasn't sure if it was cool to name drop and give you props for showing me your spot. But since you dropped to info, I can thank you publicly for sharing. I hope you are making plans to get out in the field this spring, we should go out together to get some more nice photos. Be Well, Jason