Primulina dichroantha (Gesneriaceae), a New Species from a Karst Cave from Guangxi, China

Primulina dichroantha F. Wen, Y.G. Wei & S.B. Zhou (Gesneriaceae), a new species growing in karst caves in a limestone hill in Guangxi, China, is described and illustrated. It is morphologically similar to P. renifolia and P. mollifolia, but can be distinguished by a 10–30 mm long pedicel, 1.2–1.6 cm long corolla with a white adaxial lip and bluish-purple abaxial lip, three glabrous staminodes, sparsely glandular-puberulent style, and spherical stigma.