Butterwort
Butterwort, a marsh plant that catches insects as its food. The common butterwort, or bog violet, grows as high as six inches (15 cm). At its base there is a rosette, or tuft, of oval leaves about two inches (5 cm) long. Their upper surfaces secrete a sticky digestive fluid. When an insect sticks to the leaf, the margins of the leaf roll inward and the prey is digested. The butterwort has a single violet flower one-half inch (13 mm) long that blooms at the end of a central stalk.
The common butterwort is Pinguicula vulgaris of the bladderwort family, Lentibulariaceae.