Chao Chien-Ti, Huang Bing-Hong, Chang Jui-Tse, Liao Pei-Chun
School of Life Science, National Taiwan Normal University, No. 88, Tingchou Rd. 4 section, Wenshan District, Taipei City 116, Taiwan National Taiwan Normal University Taipei City Taiwan.
PhytoKeys. 2020 Feb 24;140:33-45. doi: 10.3897/phytokeys.140.48578. eCollection 2020.
The genus comprises eight species distributed from 50 to 2000 m in Taiwan. Amongst them, and are very similar on the basis of morphological and plastid DNA sequence information. Therefore, a comprehensive study of the taxonomic status of is necessary. We reviewed the herbarium sheets, related literature and protologues and compared morphologies of these two species, as well as their phylogenetic relationships. All evidence, including the diagnostic characters between and , suggest that they belonged to a single species rather than two. As a result, is treated as a synonym of .