Abstract: The pollen grains of 27 native and introduced species belonging to 18 genera of Bignoniaceae were examined by light and scanning electron microscopes. Some of which were reported or examined by scanning electron microscope for the first time. Thought, the Bignoniaceae are conspicuously, their apertures can be divided into 3(-4) colpate, 3(-4)colporate, 3-porate, stephanocolpate types. The exine sculptures include foveo-late, rugulate, reticulate (fine and coarse reticulations) and spinulate, or psilate. Most pollen grains exist as monads but a few are tetrad. In the genus of Radermachera, the pollen aperture and sculpture are different between R.sinica and R.yunnanensis. The pollen of R.sinica is 3-porate and sculpture are different between R.sinica colpate and foveolate sculpture. In the family of Bignoniaceae, the pollen morphology is valuable both in generic delimitation and in the study of systematic relationships, especially aperture and the exine sculpture.

Key words: Bignoniaceae