<italic>Petrocosmea chrysotricha</italic> sp. nov. (<italic>Petrocosmea</italic>, Gesneriaceae), a species previously mistaken for <italic>P. begoniifolia</italic> on marlstone cliffs in Yunnan, China.

<italic>Petrocosmea chrysotricha</italic> M.Q.Han, H. Jiang & Yan Liu, a new species from Yunnan, China, is described and illustrated. <italic>Petrocosmea chrysotricha</italic> was found growing with <italic>P</italic>. <italic>melanophthalma</italic> on damp marlstone cliffs in evergreen broad‐leaved forest on Mopan Shan. The new species has been grown for decades by Gesneriad enthusiasts under the name <italic>P. begoniifolia</italic> for decades and it is indeed similar to <italic>P</italic>. <italic>begoniifolia</italic> in its oblique campanulate corolla tube, but differs by having filaments covered with golden lanate indumentum in the middle part and by having primrose yellow flowers at the beginning if anthesis, then turning white. [ABSTRACT FROM AUTHOR]