Abstract: The pollen morphology of 6 species of Aponogetonaceae was examined with light microscope(LM), scanning electron microscope(SEM) and transmission electron microscope(TEM). Our results provide the following insights:(1) Pollen of Aponogetonaceae is distal-monosulcate, boat-shaped, usually with shallow-reticulate to reticulate sculpturing, but that of Aponogeton junceus Lehm. ex Schlechtd. is spinulate.(2) The exine is composed of three layers, e. g. tectum, columellae and foot layer.(3) Some characters, such as the aperture, spinulae and structure of exine in Aponogetonaceae are identical with Hydrocharitaceae and Butomaceae, but reticulate sculpturing shows connection with Najadales. Therefore, Aponogetonaceae had better be treated as an order itself.

Key words: Aponogetonaceae, pollen morphology