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Bottom-rooting, rhizomatous, aquatic or subaquatic herbs. Lvs alternate, 3-foliolate, entire, ± obovate; basal lvs not in rosettes; petioles easily distinguishable from stem. Fls in racemes produced on a leafless, emergent scape, on short pedicels, not ephemeral. Corolla white, prominently fimbriate. Stamens almost = corolla tube, inserted near its base. Ovary superior; style exserted. Capsule 2-valved.
Cal deeply cleft; cor salverform, its lobes and throat densely and coarsely hairy within; ovary about 1/3 inferior; fr tardily dehiscent by 2 valves; glabrous, rather fleshy herbs from coarse rhizomes; lvs all basal, emergent, trifoliolate, the long petiole with a conspicuously expanded sheathing base; fls heterostylic, in a bracteate raceme terminating a shortly emergent, naked scape. Monospecific.
