Ombrocharis dulcis is a rare and endemic species in Hunan, which belongs to Ombrocharis, a monotypic genus of Labiatae. Since the type specimens were collected by H. HandelMazzetti from Yunshan, Wugang City, Hunan Province in August 1918 and published as a new genus and species in 1936, O. dulcis has not been collected for long time. Recently, this species has been rediscovered in Ningyuan County, Tongdao County, Daoxian County and Xinning County of Hunan Province. The rediscovery of which is over nearly one hundred years. The description of O. dulcis is revised based on the recent collections and photos. We redefine that the calyx pattern is 3/2 and the corolla color is white.