Reduction of Notopterygium to Hansenia (Umbelliferae)

Abstract

Morphological analysis, including detailed fruit structure investigation, confirms a hypothesis re- cently proposed on the basis of a phylogenetic analysis of DNA sequence data, on a close relation- ship between the mainly Siberian genus Hansenia and the endemic Chinese genus Notopterygium. Therefore the species of Notopterygium are transferred to the previously unispecific Hansenia and five new nomenclatural combinations are validated. As a result, Hansenia comprises six species, distributed from the mountains of S Siberia acrossMongolia and N China to the SW Chinese prov- inces of Sichuan and Yunnan.