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| Vincetoxicum gongshanense Wen B. Xu & J. Y. Shen, in Xu, Liu, Li, Yan et Shen, 2024. Photos by Jian-Yong Shen & Wen-Bin Xu. |
Abstract
Vincetoxicum gongshanense Wen B. Xu & J. Y. Shen (Apocynaceae), a new species from Gongshan County, Yunnan, China, is described and illustrated. It is similar to V. silvestre (Tsiang) Meve & Liede, V. kerrii (Craib) A. Kidyoo and V. biondioides (W. T. Wang) C. Y. Wu & D. Z. Li, but can be distinguished by the leathery leaves, five basal veins, ovate-triangular sepals, yellow corolla, lanceolate corolla lobes, wide triangular corona and reniform pollinia. Photographs, line drawing, distribution, comparison with related species, and a parallel conservation assessment are provided for this species.
Keyword: Apocynaceae, Vincetoxicum biondioides, Vincetoxicum kerrii, Vincetoxicum silvestre, Yunnan, China, Tylophora
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| Vincetoxicum gongshanense Wen B. Xu & J. Y. Shen. A. Flowering plant. B. Inflorescence in lateral view. C. Flower in ventral view. D. Gynostegium in lateral view. E. Sepals. F. Branchlets showing dense pubescence. G. Leaves showing adaxial (above) and abaxial (below) surface. H. Style-head in lateral view showing attached pollinarium I. Pollinarium. Photos by Jian-Yong Shen & Wen-Bin Xu. |
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| Vincetoxicum gongshanense Wen B. Xu & J. Y. Shen. A. Section of trailing plant in habit. B. Flower in ventral view. C. Gynostegium in lateral view. D. Anther in ventral view. E. Anther and corona in lateral view. F. Leaves showing abaxial (right) and adaxial (left) surface. G. Styles and style-head in lateral view. H. Pollinia. I. Sepals in abaxial view. Drawn by Jing-Jing Yan. |
Vincetoxicum gongshanense Wen B.Xu & J.Y.Shen, sp. nov.
貢山娃兒藤
Diagnosis: Vincetoxicum gongshanense is morphologically similar to V. silvestre, V. kerrii and V. biondioides by the habit of vines and linear lanceolate leaves, but can be distinguished by the leathery leaves, five basal veins, ovate-triangular sepals, yellow corolla, lanceolate corolla lobes, wide triangular corona and reniform pollinia. (Table 1)
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Etymology: The epithet “gongshanense” is derived from the type locality Gongshan County, Yunnan, China.
Wen-Bin Xu, Yan-Ling Liu, Xin-Wei Li, Jing-Jing Yan and Jian-Yong Shen. 2024. Vincetoxicum gongshanense (Apocynaceae), A New Species from Yunnan, China. Taiwania. 69(2); 168-172. taiwania.ntu.edu.tw/abstract/1991
