Abstract: The morphological description of Aster longipetiolatus C.C.Chang was inadequate in the original literature when compared with the specimen which we collected from its type locality,and there was a lack of cytological reports.The detailed morphological and cytological description of A.longipetiolatus were carried out,and the new evidences of plant taxonomical revision would be provided.The results showed that:（1）There were some newly-discovered characteristics for A.longipetiolatus.For example,the receptacle was convex,phyllaries3-or 4-seriate,ray floret staminodes,lamina pilosulose and achenes 5-ribbed;（2） Its cytology evidence revealed that the chromosome number was 2n=18 and the karyotype formulae was 2n=2x=16m+2sm,belonged to the type 1A.