Abstract: The micromorphology of basileaf and pollen of 6 species in Pinellia were observed under scanning electron microscpoe(SEM). Observation results show that the surface of basileaves is covered with reticulate,spot stain or filamentous stripes.The shape of tridermal cell is polyangular.The density of stomatal apparatus is (0.67-1.3)×10^2 /mm^2,and its size varies.The density of stomatal elliptic or long elliptic,and subsphaeroidal respectively.Aperture is alone apertune in polar with foramen or none.Exine sculpture is spinous process.Enzyme zymogram with A to F band was observed byexaming peroxidase(POX) in culbs of Chinese Pinellia species.There are 6,4,4 and 3 bands in P.cordata,P.pedatisecta,P.ziguiensis and P.ternata respectively.

Key words: Pinellia Morphology Micromorphology Enzyme analysis, Taxonomic sigificance