Abstract: Abstract：Pollen morphology of 15 wild lily species from Shaanxi，Sichuan，Gansu and Yunnan in the west of China were examined by the scanning electron microscopy. The results showed that：（1）The pollen grain of all the lilies are ellipsoidal or long ellipsoidal with single germinal furrow except Lilium amoenum，however，the differences of exine ornamentation are significant；（2）L. brownie，L. brownii var. viridulum，L. sargentiae，L. regale，L. leucanthum，L. leucanthum var. centifolium，L. sulphureum，L. davidii and L. lancifolium clustered in the first group and L. bakerianum，L. pumilum，L. nepalense，L. duchartrei and L. danidii var. unicolor belonged to the second group while L. amoenum formed a distinct group using clustering analysis which is accordance with the morphological classification；（3）L. amoenum is obvious different from the others due to its tetrads，therefore L. amoenum is probable to form a subgroup belonging to Sect. Lophophorum based on the comprehensive consideration of morphology，distribution and phytopalynology.

Key words: wild lily, Lilium amoenum, tetrad, pollen morphology, scanning electron microscopy