Primulina papillosa (Gesneriaceae), a new species from limestone areas of Guangxi, China

Primulina papillosa Z.B. Xin, W.C. Chou & F. Wen, a new species from limestone areas of Guangxi, China, is described and illustrated. It resembles P. linearifolia (W.T. Wang) Yin Z. Wang and P. pseudolinearifolia W.B. Xu & K.F. Chung, but can be easily distinguished by some combined characters, especially its leaf blades densely papillose-hispid. We found only one population at the type locality with no more than 200 individuals so that this new species is provisionally assessed as Critically Endangered (CR) using IUCN criteria.