Abstract: A new variety of Ligusticum L. (Umbelliferae), L. sinense var. hupehense collected from Hubei province, is described in this paper.. Cytological investigation shows that the new plant is a diploid, with the karyotypic formula 2n=22=14m+ 8sm. The parameters of chromosomes and the idiogram are given. The comparison of ARC (arm ratio curve) diagram between the new variety andL. sinense is also given.

Key words: Ligusticum sinense var. hupehense, Karyotype, ARC (arm ratio curve)