Small plants growing in bogs/fens or water. No visible leaves. Bright yellow flower. Floating plant. Bladders scattered amongst roots.
Similar species: Horned Bladderwort (Utricularia cornuta) - rooted in mud in bogs or fens; roots not visible. Flat-leaved Bladderwort (Utricularia intermedia) - also floating, bladders on separate stalks.
The flower stalk is short, standing up only a few inches above the water.
The whole plant. Common Bladderworts float in the water, with an extensive network of roots in the water.
Here the bladders are visible, scattered amongst the roots. These are how Common Bladderwort obtains its nutrients. The bladders are filled with air. When a tiny animal bventures too close it triggers a trapdoor which springs open and sucks the animal inside, where it is then digested.