Plant Diversity ›› 2016, Vol. 38 ›› Issue (06): 312-321.DOI: 10.1016/j.pld.2016.11.010

• Articles • Previous Articles    

Wuacanthus (Acanthaceae), a new Chinese endemic genus segregated from Justicia (Acanthaceae)

Yunfei Denga, Chunming Gaob, Nianhe Xiaa, Hua Pengc   

  1. a. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, People's Republic of China;
    b. Shandong Provincial Engineering and Technology Research Center for Wild Plant Resources Development and Application of Yellow River Delta, Faculty of Life Science, Binzhou University, Binzhou, 256603, Shandong, People's Republic of China;
    c. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, People's Republic of China
  • Received:2016-09-30 Revised:2016-11-25 Published:2021-11-05
  • Contact: Yunfei Deng
  • Supported by:
    This study was supported by the National Natural Science Foundation of China (grant nos. 30670124, 31270247, 31470302, 31400184, 31670191, 31110103911) and Science and Technology Basic Work (grant no. 2013FY112100). We sincerely thank Mrs. YunXiao Liu (IBSC) and Mr. Ding-Han Cui (IBSC) for preparing the line drawings; Dr. Sheng-Xiang Yu for preparing the distribution map; Prof. Wong Khoon Meng (SING) for improving the manuscript; Dr. Yihua Tong (IBSC) and Ms. Ya-Ping Chen (KUN) for their assistance with field work; and the curators of the herbaria CDBI, E, IBSC, KUN and P for facilitating access to their collections.

Abstract: A new genus, Wuacanthus Y.F. Deng, N.H. Xia & H. Peng (Acanthaceae), is described from the Hengduan Mountains, China. Wuacanthus is based on Wuacanthus microdontus (W.W.Sm.) Y.F. Deng, N.H. Xia & H. Peng, originally published in Justicia and then moved to Mananthes. The new genus is characterized by its shrub habit, strongly 2-lipped corolla, the 2-lobed upper lip, 3-lobed lower lip, 2 stamens, bithecous anthers, parallel thecae with two spurs at the base, 2 ovules in each locule, and the 4-seeded capsule. Phylogenetic analyses show that the new genus belongs to the Pseuderanthemum lineage in tribe Justicieae. Wuacanthus is closely related to Pseuderanthemum but differs from the latter by its shorter corolla tube and two minute spurs at the base of each anther-theca. W. microdontus is assessed with the status EN B2ab (iii) based on the IUCN Red List Categories and Criteria.

Key words: Acanthaceae, Jinshajiang Valley, Justicia, Justicieae, Pseuderanthemum lineage, Wuacanthus