Description from Flora of China Herbs, perennial or annual,
carnivorous, terrestrial, epiphytic, or aquatic. Roots present
or absent. Stems often (Utricularia) modified into rhizoids,
stolons, or rhizomes, rarely developed. Traps (bladders) on
rhizoids, stolons, or leaves present in Utricularia but absent
in Pinguicula. Stipules absent. Leaves alternate or in a basal
rosette, simple or variously divided. Inflorescences usually
racemes or reduced to a solitary flower; peduncle erect to
twining. Flowers ± zygomorphic. Calyx 2-5-lobed or -parted;
lobes imbricate, persistent. Corolla gamopetalous, tube short,
limb 2-lipped or equally 5-lobed; lower lip entire or 2- or
3(-6)-lobed, lobes imbricate; upper lip entire or 2- or 3-lobed;
spur subulate, cylindric, conic, or saccate. Stamens 2, inserted
at base of corolla tube, included; filaments linear, short,
curved or straight; anthers dorsifixed, ellipsoid; thecae 2,
divaricate, confluent or (in Utricularia) sometimes distinct and
± separated by a connective; stamin