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Gymnema wiyadae (Apocynaceae: Asclepiadoideae), a new species from eastern Thailand

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Summary

Gymnema wiyadae A.Kidyoo, recently discovered in eastern Thailand, is here described and compared with the morphologically similar species, G. inodorum (Lour.) Decne. and G. foetidum Tsiang. These three species are characterised by umbelliform cymes with subhypocrateriform, yellow flowers and corolline corona of five longitudinal ridges with lines of stiff golden-brown trichomes running along two sides. Gymnema wiyadae is, however, clearly distinguished from the other two species by its pubescent stem and branches with trichomes arranged in two rows, stout peduncles and pedicels, and style-head with obtuse apex. Illustrations and photographs of the new species as well as an updated identification key for all known species of Gymnema R.Br. occurring in Thailand are provided.

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Acknowledgements

I wish to thank the three anonymous reviewers and the editor who contributed with valuable comments and suggestions to improve the manuscript. I express my sincere gratitude to Assoc. Prof. Dr Obchant Thaithong for her continued support and advice. I am thankful to the staff of the herbaria BK, BKF, BM, K, L, P and QBG for permission to study herbarium specimens. This study is supported by ‘Grant for Research, Rachadaphiseksomphot Endowment Fund 2019 (CU-GR_62_58_23_21)’.

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  1. Plants of Thailand Research Unit, Department of Botany, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand

    Aroonrat Kidyoo

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  1. Aroonrat Kidyoo
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Correspondence to Aroonrat Kidyoo.

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Kidyoo, A. Gymnema wiyadae (Apocynaceae: Asclepiadoideae), a new species from eastern Thailand. Kew Bull 76, 819–825 (2021). https://doi.org/10.1007/s12225-021-09980-1

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