Abstract: A new Taxon of Bupleurum is discovered at Heilongjiang Province based on the wild investigation and morphological, anatomical, cytological and plant chemical studies. They grow with Bupleurum scorzonerifolium Willd, in the meadow steppe, bushwood and mongolica oak forest communities. But they are different from B. scorzonerifolium, such as the roots are black, no fibers at root crowns and the leaves more or less broad; there are some wood fiber groups in the root and no palisade parenchyma under lower epidermis of the leaf; the chromosome number is 2n=26 or 20 and showing bimodality; there are more saponins and less volatile oil. They are similar to the traditional Chinese medicinal drug B. chinense and have broad distribution and large amount. So they are a kind new of plant resource of Bupleurum in Heilongjiang Province. Their taxonomic name will be determined after more studies.

Key words: Bupleurum L., karyotype, new resources