Abstract
A new large tree species from peat swamp forest of Sumatera, Indonesia is described here with new notes on vegetative characters for the genus. Colour plates, as well as distribution, habitat, phenology, uses and observation notes are provided.
References
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Arnott, G.A.W. (1834) Characters of three genera of Indian plants. <em>The Edinburgh New Philosophical Journal </em>16: 314–316.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Arnott, G.A.W. (1839) Descriptions of some new or rare Indian plants. <em>Annals of Natural History</em> 3: 150–155.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beentje, H.J. (2010) <em>The Kew plant glossary: an illustrated dictionary of plant terms</em>. Royal Botanic Gardens, Kew, Richmond, x + 160 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Chisholm, R.A., Wijedasa, L.S. and Swinfield, T. (2016) The need for long-term remedies for Indonesia’s forest fires. <em>Conservation Biology</em> 30 (1): 5–6. https://doi.org/10.1111/cobi.12662</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Coughenour, J.M., Simmons, M.P., Lombardi, J.A. and Cappa, J.J. (2010) Phylogeny of Celastraceae Subfamily Salacioideae and Tribe Lophopetaleae inferred from morphological characters and Nuclear and Plastid Genes. <em>Systematic Botany</em> 35: 358–367. https://doi.org/10.1600/036364410791638289</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1962) Celastraceae–I. <em>Fl. Males., Ser. I, Spermat</em>. 6: 227–291.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1964) Celastraceae–I. <em>Fl. Males., Ser. I, Spermat</em>. 6: 389–421.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1967) <em>Sarawakodendron</em>, a new genus of Celastraceae. <em>Blumea</em> 15: 139–143.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1972) Addenda, corrigenda et emendanda. Celastraceae. <em>Fl. Males., Ser. I, Spermat</em>. 6: 930–932.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1989) Addenda, corrigenda et emendanda. Celastraceae. <em>Fl. Males., Ser. I, Spermat</em>. 10: 716.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Giesen, W., Wijedasa, L.S. & Page, S.E. (2018) Unique Southeast Asian peat swamp forest habitats have relatively few distinctive plant species. <em>Mires & Peat</em> 22.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em>, version 14. Prepared by the Standards and Petitions Committee. [http://www.iucnredlist.org/documents/RedListGuidelines.pdf] </span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kunth, K.S. (1824) Celastrinae. <em>In</em>: Humboldt, F.W.H.A. von, Bonpland, A.J.A. & Kunth, K.S. (eds.) <em>Nova genera et species plantarum</em>. Lutetiae Parisiorum, Paris, pp. 50–61.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Linnaeus, C. (1753) <em>Species Plantarum</em>. L. Salvius, Stockholm, 1200 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Loesener, L.E.T. (1906) Celastraceae in ‘R. Schlechter, Beiträge zur Kenntnis der Flora von Neu-Kaledonian’. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie</em> 39: 158–174.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Miettinen, J., Hooijer, A., Vernimmen, R., Liew, S.C. and Page, S.E. (2017) From carbon sink to carbon source: extensive peat oxidation in insular Southeast Asia since 1990. <em>Environmental Research Letters</em> 12 (2): 024014. https://doi.org/10.1088/1748-9326/aa5b6f</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Molina, G.I. (1782) <em>Saggio sulla storia naturale del Chili del signor Abate Giovanni Ignazio Molina.</em> Nella Stamperia di S. Tommaso d’Aquino, Bologna, 367 pp. https://doi.org/10.5962/bhl.title.62689</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Page, S., Mishra, S., Agus, F., Anshari, G., Dargie, G., Evers, S., Jauhiainen, J., Jaya, A., Jovani-Sancho, A.J., Laurén, A. and Sjögersten, S., Suspense, I.A., Wijedasa, L.S. & Evans, C.D. (2022) Anthropogenic impacts on lowland tropical peatland biogeochemistry. <em>Nature Reviews Earth & Environment</em> 3: 426–443. https://doi.org/10.1038/s43017-022-00289-6</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Posa, M.R.C., Wijedasa, L.S. & Corlett, R.T. (2011) Biodiversity and conservation of tropical peat swamp forests. <em>BioScience</em> 61 (1): 49–57. https://doi.org/10.1525/bio.2011.61.1.10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">POWO (2019) <em>Plants of the world online</em>. Facilitated by the Royal Botanic Gardens, Kew. Available from: http://www.plantsoftheworldonline.org/ (accessed 23 May 2022)</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Randi, A., Wijedasa, L.S. & Thomas, D.C. (2022) <em>Disepalum rawagambut</em> (Annonaceae), a new tree species from peat swamp forest of Sumatra, Indonesia. <em>Phytotaxa</em> 530 (1): 121–126. https://doi.org/10.11646/phytotaxa.530.1.14</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ridley, H.N. (1931) Additions to the Flora of Borneo and Other Malay Islands: II. <em>Bulletin of miscellaneous information</em> (<em>Royal Gardens, Kew</em>) 1931 (1): 33–39. https://doi.org/10.2307/4102587</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Simmons, M.P. (2004) Celastraceae.<em> In: </em>Kubitzki, K. (ed.) <em>The Families and Genera of Vascular Plants</em> 6. Spring-Verlag, Berlin. pp. 29–64. https://doi.org/10.1007/978-3-662-07257-8_6</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stevens, P.F. (2001 onwards) <em>Angiosperm Phylogeny Website</em>. Version 14, July 2017 [and more or less continuously updated since]. Available from: http://www.mobot.org/MOBOT/research/APweb/ (accessed 27 May 2022).</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Thwaites, G.H.W. (1853) On <em>Tetracrypta</em> and <em>Kokoona</em>, genera of Ceylon plants. <em>Hooker’s Journal of Botany and Kew Garden Miscellany. London</em> 5: 378–381.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Turner, I.M. (1997) What should the kelat trees of Malaya be called? <em>Journal of the Singapore National Academy of Science</em> 22‒24: 14–26.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Utteridge, T.M.A. (2021) Celastraceae.<em> In: </em>Utteridge, T.M.A. & Jennings, L.V.S. (eds.) <em>Trees of New Guinea</em>. Royal Botanic Gardens, Kew. pp. 208–215.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Niissalo, M.A., Chamchumroom, V., Puudjaa, P., Jumruschay, T. & Boyce, P.C. (2016) <em>Hanguana thailandica</em> (Hanguanaceae): a new peat swamp forest species from Thailand. <em>Phytotaxa</em> 280 (2): 195–199. https://doi.org/10.11646/phytotaxa.280.2.10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Jauhiainen, J., Könönen, M., Lampela, M., Vasander, H., Leblanc, M.C., Evers, S., Smith, T.E., Yule, C.M., Varkkey, H. & Lupascu, M. (2017) Denial of long-term issues with agriculture on tropical peatlands will have devastating consequences. <em>Global Change Biology</em> 23 (3): 977–982. https://doi.org/10.1111/gcb.13516</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Sloan, S., Page, S.E., Clements, G.R., Lupascu, M. & Evans, T.A. (2018) Carbon emissions from South-East Asian peatlands will increase despite emission-reduction schemes. <em>Global Change Biology</em> 24 (10): 4598–4613. https://doi.org/10.1111/gcb.14340</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Vernimmen, R., Page, S.E., Mulyadi, D., Bahri, S., Randi, A., Evans, T.A., Priatna, D., Jensen, R.M. & Hooijer, A. (2020) Distance to forest, mammal and bird dispersal drive natural regeneration on degraded tropical peatland. <em>Forest Ecology and Management</em> 461: 117868. https://doi.org/10.1016/j.foreco.2020.117868</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Arnott, G.A.W. (1839) Descriptions of some new or rare Indian plants. <em>Annals of Natural History</em> 3: 150–155.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Beentje, H.J. (2010) <em>The Kew plant glossary: an illustrated dictionary of plant terms</em>. Royal Botanic Gardens, Kew, Richmond, x + 160 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Chisholm, R.A., Wijedasa, L.S. and Swinfield, T. (2016) The need for long-term remedies for Indonesia’s forest fires. <em>Conservation Biology</em> 30 (1): 5–6. https://doi.org/10.1111/cobi.12662</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Coughenour, J.M., Simmons, M.P., Lombardi, J.A. and Cappa, J.J. (2010) Phylogeny of Celastraceae Subfamily Salacioideae and Tribe Lophopetaleae inferred from morphological characters and Nuclear and Plastid Genes. <em>Systematic Botany</em> 35: 358–367. https://doi.org/10.1600/036364410791638289</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1962) Celastraceae–I. <em>Fl. Males., Ser. I, Spermat</em>. 6: 227–291.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1964) Celastraceae–I. <em>Fl. Males., Ser. I, Spermat</em>. 6: 389–421.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1967) <em>Sarawakodendron</em>, a new genus of Celastraceae. <em>Blumea</em> 15: 139–143.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1972) Addenda, corrigenda et emendanda. Celastraceae. <em>Fl. Males., Ser. I, Spermat</em>. 6: 930–932.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ding Hou (1989) Addenda, corrigenda et emendanda. Celastraceae. <em>Fl. Males., Ser. I, Spermat</em>. 10: 716.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Giesen, W., Wijedasa, L.S. & Page, S.E. (2018) Unique Southeast Asian peat swamp forest habitats have relatively few distinctive plant species. <em>Mires & Peat</em> 22.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em>, version 14. Prepared by the Standards and Petitions Committee. [http://www.iucnredlist.org/documents/RedListGuidelines.pdf] </span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kunth, K.S. (1824) Celastrinae. <em>In</em>: Humboldt, F.W.H.A. von, Bonpland, A.J.A. & Kunth, K.S. (eds.) <em>Nova genera et species plantarum</em>. Lutetiae Parisiorum, Paris, pp. 50–61.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Linnaeus, C. (1753) <em>Species Plantarum</em>. L. Salvius, Stockholm, 1200 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Loesener, L.E.T. (1906) Celastraceae in ‘R. Schlechter, Beiträge zur Kenntnis der Flora von Neu-Kaledonian’. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie</em> 39: 158–174.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Miettinen, J., Hooijer, A., Vernimmen, R., Liew, S.C. and Page, S.E. (2017) From carbon sink to carbon source: extensive peat oxidation in insular Southeast Asia since 1990. <em>Environmental Research Letters</em> 12 (2): 024014. https://doi.org/10.1088/1748-9326/aa5b6f</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Molina, G.I. (1782) <em>Saggio sulla storia naturale del Chili del signor Abate Giovanni Ignazio Molina.</em> Nella Stamperia di S. Tommaso d’Aquino, Bologna, 367 pp. https://doi.org/10.5962/bhl.title.62689</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Page, S., Mishra, S., Agus, F., Anshari, G., Dargie, G., Evers, S., Jauhiainen, J., Jaya, A., Jovani-Sancho, A.J., Laurén, A. and Sjögersten, S., Suspense, I.A., Wijedasa, L.S. & Evans, C.D. (2022) Anthropogenic impacts on lowland tropical peatland biogeochemistry. <em>Nature Reviews Earth & Environment</em> 3: 426–443. https://doi.org/10.1038/s43017-022-00289-6</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Posa, M.R.C., Wijedasa, L.S. & Corlett, R.T. (2011) Biodiversity and conservation of tropical peat swamp forests. <em>BioScience</em> 61 (1): 49–57. https://doi.org/10.1525/bio.2011.61.1.10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">POWO (2019) <em>Plants of the world online</em>. Facilitated by the Royal Botanic Gardens, Kew. Available from: http://www.plantsoftheworldonline.org/ (accessed 23 May 2022)</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Randi, A., Wijedasa, L.S. & Thomas, D.C. (2022) <em>Disepalum rawagambut</em> (Annonaceae), a new tree species from peat swamp forest of Sumatra, Indonesia. <em>Phytotaxa</em> 530 (1): 121–126. https://doi.org/10.11646/phytotaxa.530.1.14</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ridley, H.N. (1931) Additions to the Flora of Borneo and Other Malay Islands: II. <em>Bulletin of miscellaneous information</em> (<em>Royal Gardens, Kew</em>) 1931 (1): 33–39. https://doi.org/10.2307/4102587</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Simmons, M.P. (2004) Celastraceae.<em> In: </em>Kubitzki, K. (ed.) <em>The Families and Genera of Vascular Plants</em> 6. Spring-Verlag, Berlin. pp. 29–64. https://doi.org/10.1007/978-3-662-07257-8_6</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stevens, P.F. (2001 onwards) <em>Angiosperm Phylogeny Website</em>. Version 14, July 2017 [and more or less continuously updated since]. Available from: http://www.mobot.org/MOBOT/research/APweb/ (accessed 27 May 2022).</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Thwaites, G.H.W. (1853) On <em>Tetracrypta</em> and <em>Kokoona</em>, genera of Ceylon plants. <em>Hooker’s Journal of Botany and Kew Garden Miscellany. London</em> 5: 378–381.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Turner, I.M. (1997) What should the kelat trees of Malaya be called? <em>Journal of the Singapore National Academy of Science</em> 22‒24: 14–26.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Utteridge, T.M.A. (2021) Celastraceae.<em> In: </em>Utteridge, T.M.A. & Jennings, L.V.S. (eds.) <em>Trees of New Guinea</em>. Royal Botanic Gardens, Kew. pp. 208–215.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Niissalo, M.A., Chamchumroom, V., Puudjaa, P., Jumruschay, T. & Boyce, P.C. (2016) <em>Hanguana thailandica</em> (Hanguanaceae): a new peat swamp forest species from Thailand. <em>Phytotaxa</em> 280 (2): 195–199. https://doi.org/10.11646/phytotaxa.280.2.10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Jauhiainen, J., Könönen, M., Lampela, M., Vasander, H., Leblanc, M.C., Evers, S., Smith, T.E., Yule, C.M., Varkkey, H. & Lupascu, M. (2017) Denial of long-term issues with agriculture on tropical peatlands will have devastating consequences. <em>Global Change Biology</em> 23 (3): 977–982. https://doi.org/10.1111/gcb.13516</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Sloan, S., Page, S.E., Clements, G.R., Lupascu, M. & Evans, T.A. (2018) Carbon emissions from South-East Asian peatlands will increase despite emission-reduction schemes. <em>Global Change Biology</em> 24 (10): 4598–4613. https://doi.org/10.1111/gcb.14340</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wijedasa, L.S., Vernimmen, R., Page, S.E., Mulyadi, D., Bahri, S., Randi, A., Evans, T.A., Priatna, D., Jensen, R.M. & Hooijer, A. (2020) Distance to forest, mammal and bird dispersal drive natural regeneration on degraded tropical peatland. <em>Forest Ecology and Management</em> 461: 117868. https://doi.org/10.1016/j.foreco.2020.117868</span></span></span></p>