the flypaper trap utilizes sticky mucilage or glue. the leaf of flypaper traps is studded with mucilage-secreting glands, which may be short (like those of the butterworts), or long and mobile (like those of many sundews). flypapers have evolved independently at least five times. there is evidence that some clades of flypaper traps have evolved from morphologically more complex traps such as pitchers.