(1)any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals
(2)タヌキモ属の多くの水性食虫植物の総称で、そのうちある種のものは微小な水性生物を罠にかけるために葉が小さな壺形の嚢に変わっている