Reversal versus specialization in floral morphological evolution in Petrocosmea (Gesneriaceae)
Chao-Qun Li, Tian-Feng Lü, Meng-Qi Han, Yang Dong, Peng-Wei Li, Yan Liu, and Yin-Zheng Wang
J Syst Evol . 2020, (2): 145 -158 .  DOI: 10.1111/jse.12541