The newly refined genus Petrocodon Hance(Gesneriaceae), mainly distributed from South China to Southwest China, is comprised of 34 species and one variety. A new species, Petrocodon tenuitubus W. H. Chen, F. Wen & Y. M. Shui, distributed in the limestone region from Maguan County, Yunnan Province, China, is illustrated and described here. The new species is similar to P. lui, P. hispidus and P. jasminiflorus, but it can be easily distinguished from P. lui and P. hispidus by its slender and curved corolla tube, three linear to lanceolate bracts and bracteoles, and one disc-shaped stigma. And it also can be easily distinguished from P. jasminiflorus by its ovate to orbicular leaves, ovate corolla lobes with obtuse apex, bracts and bracteoles 3, and staminodes 1. The discovery of this new species has certain significance for promoting the excavation of the resources of the Gesneriaceae in limestone area of China. The holotype and paratype specimens are deposited in Herbarium of Kunming Institute of Botany, Chinese Academy of Sciences(KUN); isotype specimens is deposited in Herbarium of Guangxi Institute of Botany(IBK).
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