Lahiru S. Wijedasa1,2,3 *, MATTI A. NIISSALO1, VORADOL CHAMCHUMROOM4, PACHOK PUUDJAA4,
THAVEECHOCK JUMRUSCHAY4 & PETER C. BOYCE5

1 Theoretical Ecology & Modelling Lab, Department of Biological Sciences, National University of Singapore, 14 Science Drive 4,
Singapore 117543.
2 ConservationLinks, 433 Clementi Avenue 3, #01-258, Singapore 120433.
3 Rimba, 18E KampungBasung, Kuala Berang 21700, Terengganu, Malaysia.
4 The Forest Herbarium, Department of National Parks, Wildlife and Plant Conservation, 61, Phahonyothin Road, LadyaoChatuchak, Bangkok 10900, Thailand.
5 Institute of Biodiversity and Environmental Conservation (IBEC), Universiti Malaysia Sarawak, 94300 Samarahan, Sarawak,
Malaysia.
*Corresponding author, E-mail: lahirux@gmail.com

A new species of Hanguana (Hanguanaceae), H. thailandica, is described and illustrated from Trang province, Peninsular
Thailand. This is the second Hanguana species recorded in Thailand, along with the widespread helophytic H. malayana.
The species is morphologically similar to Hanguana exultans and H. nitens found in swamp forests habitats in southern Peninsular Malaysia and Singapore. The conservation status of this species is accessed as Endangered according to the IUCN
Red List Category and Criteria.

Keywords: Commelinales, IUCN, Peat swamp forest, Peninsular Thailand, Trang

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