Abstract: Pollen grains of 6 species and 1 variety of Hemerocallis were examined by LM and SEM. Pollen morphology is more or less different for each species. It shows interspecific pollen morphology of Hemerocallis in Nor-thwest is significant for classification. By making a study of them, 6 species and 1 variety can be divided naturally into two groups. The first group consists of Hemerecallis minor Mill., H. esculenta Koidz. and H. ci-trina Baroni. The second one includes H. plicala Stapf, H. fulva (L.) L., H. fulva var. kwanso Regel and H. lilio-asphodelus L. emend. Hyland.#br#There is the difference for pollen morphology of H. minor and H. lilio-asphodelus. Evidence shows it is improper that H. minor was designated as a variety of H. lilio-asphodelus.