Small
aquatic plants with a single flower on a scape or a few-flowered raceme terminal
on a scape or peduncle; calyx 2-lipped; corolla deeply 2-lipped, the lower lip
larger and 3-lobed with a bearded palate and a nectiferous spur at the base;
stamens 2, anther sacs grow together into one; style short or none, stigma 1-or
2-lipped; leaves sometimes none, when present either in a basal rosette or along
floating stems; when leaves are submersed they are dissected and produce
numerous small bladders which entrap small creatures.