Isotrema sanyaense, a new species of Aristolochiaceae from Hainan, China

Rongtao Li; Zhiwei Wang; Jun Wang; Xinxin Zhu; Han Xu

doi:10.3897/phytokeys.128.35042

Isotrema sanyaense, a new species of Aristolochiaceae from Hainan, China

PhytoKeys. 2019 Aug 12:128:85-96. doi: 10.3897/phytokeys.128.35042. eCollection 2019.

Authors

Rongtao Li¹, Zhiwei Wang², Jun Wang³, Xinxin Zhu³, Han Xu⁴

Affiliations

¹ Hainan Branch of the Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haikou, Hainan, 570100, China Hainan Branch of the Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences Haikou China.
² College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, 550002, China Guizhou University Guiyang China.
³ College of Life Sciences, Xinyang Normal University, Xinyang, Henan, 464000, China Xinyang Normal University Xinyang China.
⁴ Research Institute of Tropical Forestry, Chinese Academy of Forestry, Longdong, Guangzhou 510520, China Research Institute of Tropical Forestry, Chinese Academy of Forestry Guangzhou China.

Abstract

Isotrema sanyaense R.T.Li, X.X.Zhu & Z.W.Wang, sp. nov., a new species from Hainan island, China, is described and illustrated here. It is morphologically most similar to I. ledongense (Han Xu, Y.D.Li & H.J.Yang) X.X.Zhu, S.Liao & J.S.Ma and I. jianfenglingense (Han Xu, Y.D.Li & H.Q.Chen) X.X.Zhu, S.Liao & J.S.Ma in the shape of leaf, flower, and the yellow to brown villous indumentum of the pedicel, ovary and calyx. However, I. sanyaense can be easily distinguished from the latter two species by its 1-5-flowered cymes, in hanging clusters of 1 to numerous branches, upper calyx tube obviously longer than basal calyx tube, calyx limb discoid, yellow inside, with purple-red stripes and spots, about 13-18 mm in diameter, glabrous, and a throat dark red without spots, 4-6 mm wide.

Keywords: Aristolochia; Aristolochia subgenus Siphisia; Asia; morphology; taxonomy.

Grants and funding

This study was jointly supported by the National Natural Science Foundation of China (grant nos. 31760053 and 31600161), the Natural Science Foundation of Guizhou Department of Education (QianJiaoHe KY Zi [2018]089), the Foundation of Guizhou Administration of Traditional Chinese Medicine (QZYY–2018–097) and the First-class Construction Disciplines Sub Project in Guizhou Province (Science of Chinese materia medica; GNYL[2017]008 Hao–7).