Isodonxiaoluzhiensis (Lamiaceae, Nepetoideae), a new species from Yunnan, southwest China.

Isodonxiaoluzhiensis , a new species of the tribe Ocimeae in family Lamiaceae, is described and illustrated. The new species is known only from the type locality, Xiaoluzhi village in Luzhijang dry-hot valley of Yimen County, central Yunnan, southwest China. It is characterized by having a procumbent habit, gracile stems and branches, relatively small leaves and flowers, and the phenology of flowering in winter. The morphological comparisons with its putative closest relatives ( I.adenanthus and I.hsiwenii ) are also presented.