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A taxonomic revision of Santisukia Brummitt (Bignoniaceae) in Thailand

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Summary

A revision of the endemic Thai genus Santisukia Brummitt (Bignoniaceae) is presented. Its two species, S. kerrii (Barnett & Sandwith) Brummitt and S. pagetii (Craib) Brummitt are described with updated descriptions, conservation assessments and an identification key, as well as studies of the species’ leaf and wood anatomy. Radermachera pagetii (basionym of S. pagetii) is lectotypified here. Anatomical characters can be used to distinguish the two species: S. kerrii has bifacial leaves and its wood has heterocellular rays, mostly biseriate, with the procumbent cells typically up to 25 cells long, but S. pagetii has unifacial leaves and its wood has heterocellular rays, mostly triseriate, with the procumbent cells typically up to 10 cells long.

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Acknowledgements

This work was financially supported by the Kasetsart University Research and Development Institute (KURDI), Project No. 49.60 (2017) under the research project entitled “Morphology, Anatomy and Pollen Morphology of the Genera Dolichandrone, Santisukia and Stereospermum (Bignoniaceae) in Thailand”. We would like to thank the curators and staff of BK, BKF and K for their assistance during visits and allowing access to the herbarium specimens; and also BM, E, GBIF, K, L and P for access to their digital herbarium databases. We are grateful to Mr Yutthana Thongboonkuea, head of Tham Phet-Tham Thong Forest Park, Mr Phachon Wiriya, staff of Tham Prathun Non-hunting Area, and Mr Wallop Changsuwan, staff of Khao Nang Phanthurat Forest Park for their facilitation of field work, Miss Ajaree Thonglim for the line drawings, Miss Siriporn Chodchoy, Mr Pisit Kimha, Miss Ajaree Thonglim and Miss Roypim Thananusak for their kind help with field work.

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Correspondence to Weereesa Boonthasak.

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Meeprom, N., Ngernsaengsaruay, C. & Boonthasak, W. A taxonomic revision of Santisukia Brummitt (Bignoniaceae) in Thailand. Kew Bull 77, 555–567 (2022). https://doi.org/10.1007/s12225-022-10028-1

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