Abstract:Pollen morphology in five species of Manglietia is similar. Pollen grains are large with the longest axis more than 45μm. Foveolate sculpture is observed on exine surface in all the five species except Manglietiamoto and M. pachyphylla which have slightly coarse exine. The exine of all species can be distinguished by itstectum, baculum and foot-layer. The perforation in tectum is clear. The colpus membrane consists of a thin foot-layer and intine, while the sexine elements (tectum and baculum) are reduced gradually．Spherical granules are frequently observed in baculum with small intraexinous spaces， which is at initial developmental stage． This study supports that genus Manglietia is the most primitive group in Magnoliaceae.
