Plant Diversity ›› 2021, Vol. 43 ›› Issue (01): 54-62.DOI: 10.1016/j.pld.2020.06.004

• Articles • Previous Articles    

Molecular and morphological evidence for a new species of Isodon (Lamiaceae) from southern China

Ya-Ping Chena, Cun-Zhong Huangb, Yue Zhaoa,c, Chun-Lei Xianga   

  1. a CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China;
    b Natural Resources Bureau of Guidong County, Chenzhou 423000, Hunan, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-04-14 Revised:2020-06-22 Published:2021-03-25
  • Contact: Chun-Lei Xiang
  • Supported by:
    We would like to thank the staff of the following herbaria for their valuable help in research facilities: BM, CDBI, E, HIB, IBK, IBSC, K, KUN, KYO, LE, MW, NAS, PE, SZ, TI. Thanks are also given to Ms. Ling Wang from the Kunming Institute of Botany for her line drawing of the new species and Dr. Bryan T. Drew from the University of Nebraska for improving the English. Our manuscript also benefitted greatly from the constructive comments of two anonymous reviewers. This work was supported by the National Natural Science Foundation of China (Grant no. 31670197) and the CAS “Light of West China” Program, the Special Funds for the Young Scholars of Taxonomy of the Chinese Academy of Sciences (Grant no. ZSBR-006), the “Ten Thousand Talents Program of Yunnan” (YNWR-QNBJ-2018-279), and the “Yunnan Fundamental Research Projects” (2019FI009).

Abstract: Isodon brevipedunculatus, a new species from southern China, is described and illustrated. The phylogenetic position of the new species within the genus was analyzed based on two nuclear ribosomal DNA regions and an ingroup sampling of about 80% of Asian species of Isodon. The results show that I. brevipedunculatus is recovered in a clade that consists of species mainly with glandular mericarps and that are distributed in the Sino-Japanese region. Combining molecular and geographical evidence, our study reveals that I. brevipedunculatus is most closely related to Isodon amethystoides and Isodon bifidocalyx, but differs from the former in lamina shape, number of flowers per cyme, and peduncle length, and from the latter in lamina indumentum, calyx morphology, and corolla length.

Key words: Himalaya-Hengduan Mountains region, Isodoninae, Mericarp, Sino-Japanese region