Bladderworts have finely divided underwater leaves which bear tiny bladders that entrap minute water life. The 2-lipped flowers grow singly or in a small cluster at the top of the stalk.
There are 8 species in our area. Horned bladderwort can be distinguished by the conspicuous spur (horn) projecting downward from the base of the flower.
The stalk of the plant is erect, not floating or creeping.
Horned bladderwort is found in fens, margins of ponds and lakes, marshy shores and wet sandy to peaty shorelines.
The wetland area that I was canoeing in had carpets of these yellow flowers.
Plants can be up to 35 cm high
Some have flowers just above the surface.