Insectivorous, annual or perennial, aquatic herbs, rooted in
substrate, or rootless, often free-floating. Leaves simple, entire, alternate or
arranged in rosettes, covered with glandular hairs or bearing bladders.
Digestive processes occur in in the bladders (Utricularia). Trap, a hollow bag, borne at end of stalk, with small
entrance near or opposite the stalk. Entrance carries projecting bristles.
Inflorescence raceme or spike of irregular flowers. Calyx 2-5 lobed, 2-lipped
corolla, lower lip spurred. Stamens 2, borne on petals. Ovary superior, 2
united carpels and a single locule, with 1 to numerous ovules. Stigma 2 lobes.
Fruit a capsule, indehiscent or opens by valves.