A South African plant genus of the family Iridaceae; contains bufadienolide cardiac glycosides which cause diarrhea, dysentery, tympany, stiff gait and sudden death. Includes H. flaccida (H. aurantica, H. breynia, H. collina), H. glauca (H. natalensis), H. miniata, H. mossii, H. ochroleuca (H. lucasi), H. pallida, H. pura. Called also native tulip, Cape tulip, Natal yellow tulip.




