Synonyms: Bulliarda capensis (homotypic); Crassula levynsiae; Crassula natans f. amphibia; Crassula natans f. filiformis; Crassula natans f. fluitans; Crassula natans f. obovata; Crassula natans natans; Crassula natans var. natans; Helophytum filiforme; Helophytum filiforme var. parvulum; Helophytum fluitans; Helophytum fluitans var. intermedium; Helophytum fluitans var. obovatum; Helophytum natans; Helophytum natans var. amphibia; Helophytum natans var. filiformis; Helophytum natans var. fluitans; Helophytum natans var. obovatum; Helophytum reflexum; Tillaea capensis; Tillaea filiformis (homotypic); Tillaea filiformis var. parvula (homotypic); Tillaea fluitans; Tillaea fluitans var. intermedia (homotypic); Tillaea fluitans var. obovata (homotypic); Tillaea reflexa (homotypic)