Petrocodon dahuaensis , a new species from a limestone area of Guangxi, China, is described and illustrated. The new species is similar to P. asterostriatus but differs in its leaf blade, cordate to subrounded, margin crenate to serrate; bracts, bracteoles, and calyx smaller; corolla purple, base straight to slightly inflated; filaments purple; and style densely glandular-puberulent. Molecular evidence also supports its close relationship with P. asterostriatus . According to the IUCN Red List Categories and Criteria, the provisional conservation status of P. dahuaensis is assessed as Data Deficient (DD).