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Background  The limestone karsts of Southeast Asia and South China are a major biodiversity hotspot of global terrestrial biomes. With more than 130 described species,  Paraboea  has become one of the most characteristic plant groups in the Southeast Asian limestone flora. During the course of extensive field work on the limestone formations of southern and southwestern China, three unknown species of  Paraboea  were collected.    Results  Molecular phylogenetic analyses based on nuclear ITS and chloroplast  trnL - F  sequences strongly confirm the placements of the three new species in  Paraboea  sensu Puglisi et al. (Taxon 65:277–292. 10.12705/652.5,  2016 ). Moreover, these three novelties can be distinguished from known  Paraboea  species with distinct morphological characters, further supporting their recognition as new species.    Conclusions  With the support of detailed morphological studies and molecular phylogenetic analyses,  Paraboea dushanensis ,  P. sinovietnamica  and  P. xiangguiensis  are recognized as three species new to science.    Electronic supplementary material  The online version of this article (10.1186/s40529-017-0207-5) contains supplementary material, which is available to authorized users.

Three new species of Paraboea (Gesneriaceae) from limestone karsts of China based on morphological and molecular evidence