Primulina acutiloba (Gesneriaceae), a new species from Northwest Guangxi, China

A new species of Gesneriaceae, Primulina acutiloba C. Xiong, J. X. Fu & F. Wen, from the limestone karsts of Northwest Guangxi, China, is described and illustrated. Morphologically, it resembles Pri. pingguoensis H. S. Ma & B. Pan and Pri. pseudoeburnea (D. Fang & W. T. Wang) Mich. Möller & A. Weber in corolla shape and coloration, particularly in the presence of purple stripes extending from the throat to the lobes.

However, it can be readily distinguished by a combination of characters, including the shape of the leaf blades, bracts, and calyx lobes, the length of the peduncle and pistil, and the height of the disc. Currently, only a single population is known from the type locality, comprising approximately 60–80 mature individuals. Following the IUCN Red List Categories and Criteria, the species is provisionally assessed as Endangered (EN C 2 b).