Qiu, Z.-J., Wang, X.-L., Liu, Z.-Y., Yang, J.-F. & Zhang, S.-Z. (2012)

Cytological and phylogenetic study of Petrocosmea hexiensis (Gesneriaceae), a new species from Chongqing, China

. Phytotaxa 74 (1): 30–38. https://doi.org/10.11646/phytotaxa.74.1.2