Primulina zhoui and P. Huangii (Gesneriaceae), two new species from limestone areas in Guangxi, China

Primulina zhoui and Primulina huangii, two new species of Gesneriaceae from the limestone area in Guangxi, China are described and illustrated. Primulina zhoui is similar to Primulina multifida B. Pan & K.F. Chung, but differs from the latter in its bracts, calyx lobes, corolla, adaxial lip and disc. Primulina huangii closely resembles Primulina bipinnatifida (W.T. Wang) Y.Z. Wang & J.M. Li, but differs from the latter in its bracts, pedicel, corolla, corolla tube, adaxial lip and pistil.