There are about 80 species of butterwort. These plants trap insects on their sticky leaves. The leaves then digest the insects. Many butterworts have different leaves in winter that do not eat insects. The Common butterwort lives in marshes, bogs, and swamps around the world. Its purple flowers have given it the name marsh violet or bog violet.
- "Pinguicula vulgaris". Encyclopedia of Life, available from: http://eol.org/pages/577827/details Pinguicula
- 'Titan'. Available from: http://www.cascadecarnivores.com/product_info.php?products_id=166
- “Pinguicula vulgaris.” Wikipedia, The Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Pinguicula_vulgaris
- “Pinguicula.” Wikipedia, The Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Pinguicula