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The correct name for Pseuderanthemum lilacinum, P. teijsmannii and P. teysmannii (Acanthaceae) in Peninsular Malaysia

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Summary

Pseuderanthemum lilacinum Stapf is known from a single specimen collected in 1909 from Batu Caves, a karst limestone hill in Selangor, Peninsular Malaysia. Ridley had drawn attention to similarities between it and P. teijsmanni (C.B.Clarke) Stapf, which grows in lowland forest in Peninsular Malaysia. Examination of a range of specimens shows this conclusion to be correct and P. lilacinum becomes a synonym of P. teijsmannii. Confusion with the names Eranthemum teijsmanni T.Anderson, E. teijsmanni T.Anderson ex C.B.Clarke, Pseuderanthemum teysmanni Ridl., P. teijsmannii (C.B.Clarke) Stapf and Pseuderanthemum teysmannii (Miq.) Ridl. is resolved. Eranthemum teijsmanni T.Anderson is a nomen nudum without a type specimen. Eranthemum teijsmanni T.Anderson ex C.B.Clarke describes a Peninsular Malaysian taxon and is based on a detailed description and citation of specimens. In transferring Peninsular Eranthemum species to Pseuderanthemum, Ridley used the name P. teysmanni Ridl. for Clarke’s species. However, Stapf had already validated the combination in Pseuderanthemum and so this species should correctly be cited as P. teijsmannii (C.B.Clarke) Stapf. It is endemic in Peninsular Malaysia. P. teijsmannii (C.B.Clarke) Stapf and P. teysmannii (Miq.) Ridl. have both been misapplied to Chinese species, which are quite different from the Peninsular species.

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Acknowledgements

Grateful thanks to N. Mohamad Aidil, Imin Kamin, Mohd Hairul Mohd Amin, Wan Mohd Syafiq Wan Putra and Fakrullah Haziq Hashim of the KEP Herbarium, Forest Research Institute Malaysia, for providing crucial field support, team members of the Rapid Biodiversity Assessment of Batu Caves in 2016, and to the Selangor State Government for funding; to Malaysian Caves & Karst Conservancy that facilitated our survey in 2018 – 2019 as part of the Batu Caves Scientific Expedition, to the Majlis Perbandaran Selayang for granting permission to access the hill; and to the Curator at K for permission to examine herbarium specimens. This research was carried out under Project "Dokumentasi dan Konservasi Biodiversiti Demi Kesejahteraan Hutan dan Kemampanan Sumber Semulajadi (Fasa 1): Subproject 1 - Diversiti, Dokumentasi dan Status Konservasi Tumbuhan bagi Pengurusan Sumber Hutan Secara Mampan di Malaysia".

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  1. Forest Research Institute Malaysia, Kepong, Selangor, Malaysia

    Ruth Kiew & A. R. Rafidah

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  1. Ruth Kiew
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  2. A. R. Rafidah
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Correspondence to Ruth Kiew.

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Kiew, R., Rafidah, A.R. The correct name for Pseuderanthemum lilacinum, P. teijsmannii and P. teysmannii (Acanthaceae) in Peninsular Malaysia. Kew Bull 77, 781–786 (2022). https://doi.org/10.1007/s12225-022-10036-1

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  • DOI: https://doi.org/10.1007/s12225-022-10036-1

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