Hemiboea angustifolia (Gesneriaceae), a new species endemic to a tropical limestone area of Guangxi, China

Hemiboea angustifolia, a new species of Gesneriaceae from Guangxi, China, is described and illustrated. The new species is morphologically similar to H. cavaleriei var. paucinervis and H. longgangensis, both found in southwestern Guangxi, China. A description of H. angustifolia, together with illustrations, a distribution map, habitat description, conservation assessment and a diagnostic comparison with H. longgangensis, H. cavaleriei var. cavalerieri and H. cavaleriei var. paucinervis are presented.