Based on the morphological observation and anatomical study,we revealed the developmental characteristics of bulbil,which is the vegetative propagule of Banxia(Pinellia ternata).The bulbil of P.ternata was formed in the lower part of petiole.In young leaves,it was started from the parenchyma cells that located in the adaxial part near the outer ring of three-ring vascular bundle.Dedifferentiation cells divided continuously to form the primodia of bulbil.The primodia differentiated to form the shoot apical meristem(SAM) on the top and to form the infant bulbil after it grew enough to protrude the surface of petiole.There was not root formation for developing bulbil.Bulbil growth stopped because of leaf senescence naturally.Our results indicated that bulbil of P.ternata was vegetative progagule that resembles the adventitious bud.The development of bulbil in P.ternata was different from the formation of bulbils in other kinds of plant species.