Oreocharis caotierui, a new species of Gesneriaceae from southern Hunan, China

Oreocharis caotierui , a new species, is described and illustrated from southern Hunan, China. It is similar to O. argyreia and O. xiangguiensis , but differs from the latter two in the following features: the corolla tube is significantly widened above the middle; the stamens are divided into two groups, one on each sides of the pistil and the lower two clearly protruding outside the corolla; the staminodes are 1.0–1.3 cm long. Following the IUCN Red List Criteria, O. caotierui is assessed as ‘Vulnerable' (VU) D1.