Year of Publication: 2018, Vol. 70 (2)

Date Published 14 December 2018
S.K. Ganesan & Ali Ibrahim

Shorea sumatrana (Dipterocarpaceae), a remarkable new addition to the flora of Singapore [Page 261 - Page 266]
Shorea sumatrana (Slooten ex Thorenaar) Symington ex Desch is newly recorded
for Singapore from remnant lowland dipterocarp forest in the Singapore Botanic Gardens’ Rain Forest. The species is described and illustrated, the name is lectotypified and notes on distribution, ecology and conservation status are given. This species is assessed as Critically Endangered for Singapore.

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W.W. Seah & K.M. Wong

Flora of Singapore precursors, 1. Gynochthodes praetermissa (Rubiaceae: Morindeae), a new West Malesian species, with notes on related taxa [Page 267 - Page 273]
Gynochthodes praetermissa is newly described for the flora of western Malesia. It most resembles Gynochthodes coriacea, with which it has been confused. They can be distinguished on various leaf attributes and by the new species having corolla lobes at most twice as long as the corolla tube, whereas Gynochthodes coriacea has corolla lobes at least three times as long as the tube. Gynochthodes coriacea and G. sublanceolata are found to be synonymous, the former having priority.

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K.M. Wong & H.K. Lua

Flora of Singapore precursors, 3. A new species of Canthium (Rubiaceae: Vanguerieae) previously confused with C. horridum [Page 275 - Page 282]
Canthium malayense K.M.Wong is described as a new species mainly occurring in the Malay Peninsula but also found in Sumatra and Borneo. It was previously confused with the Javanese Canthium horridum Blume. Differences in the morphology of the two species are discussed.

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I.M. Turner

Flora of Singapore precursors, 5. Some resolution of a long-standing problem in Psychotria (Rubiaceae) of Singapore [Page 283 - Page 288]
Owing to a mix-up by Wallich, there has been confusion over the application of three names in Psychotria based on collections made by William Jack, purportedly in Penang in 1819. As pointed out by Merrill, Psychotria malayana Jack is the same species as P. stipulacea Wall. and not P. aurantiaca Wall. The plants from Java that were referred by Blume to Psychotria aurantiaca were renamed P. valetonii by Hochreutiner. However, there is an earlier name available, Psychotria megacoma Miq. While specimens from Singapore that were referred to as Psychotria sp. 9 by Wong show some differences from much of the material from Java, the wide variation in material from Borneo leads to the decision to treat P. megacoma Miq. as the correct name for plants from Singapore, Sumatra, Java and Borneo. A secondstep lectotypification is made for Psychotria malayana Jack and lectotypes are designated for P. stipulacea Wall., P. megacoma Miq., Grumilea aurantiaca var. lutescens Miq. and G. aurantiaca var. subplumbea Miq.
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W.W. Seah & K.M. Wong

Flora of Singapore precursors, 7. A newly diagnosed species of Neonauclea (Rubiaceae: Naucleeae) now extinct in Singapore and notes on Neonauclea excelsa and N. calycina. [Page 289 - Page 294]
Neonauclea kranjiensis K.M.Wong & W.W.Seah, a newly diagnosed species from Singapore, is described. It most resembles Neonauclea excelsa (Blume) Merr. from which it differs in its smaller, narrowly elliptic leaves as well as smaller mature flowering heads. The taxa known as Neonauclea excelsa and N. calycina (DC.) Merr. in Java, Peninsular Malaysia and parts of Borneo are just one species to which the name Neonauclea excelsa must be applied. Neonauclea calycina continues to be recognised as a species in the Philippines pending further study.
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I.M. Turner, M. Rodda, K.M. Wong & D.J. Middleton

Flora of Singapore precursors, 9: The identities of two unplaced taxa based on types from Singapore [Page 295 - Page 299]

Work on the Gentianales for the Flora of Singapore has clarified the identities of two names based on types collected in Singapore that have long been considered of uncertain application. Dischidia wallichii Wight is shown to be a synonym of Micrechites serpyllifolius (Blume) Kosterm. (Apocynaceae) and Saprosma ridleyi King & Gamble is a synonym of Psychotria maingayi Hook.f. (Rubiaceae). A lectotype is designated for Dischidia wallichii.

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S.K. Ganesan

Flora of Singapore precursors, 10. Validation of Mangifera paludosa (Anacardiaceae) and notes on its distribution, ecology and conservation status in Singapore [Page 301 - Page 305]

The name Mangifera paludosa Kosterm. ex S.K.Ganesan is validated and described. Notes on distribution, ecology and conservation status are given.

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I.M. Turner, Y.W. Low, M. Rodda, K.M. Wong & D.J. Middleton

The plant taxa of H.N. Ridley, 5. The Gentianales [Page 307 - Page 395]
Henry Nicholas Ridley (1855–1956) described more than 450 taxa of Gentianales, mostly from Southeast Asia, and was the author of over 70 additional combinations in this order. A listing of these names with place of publication and the types of the Ridley basionyms is given here. Many names are lectotypified. The new combinations Chassalia pauciflora (Ridl.) I.M.Turner and Chassalia violascens (Ridl.) I.M.Turner are proposed for Cephaelis pauciflora Ridl. and Gartnera violascens Ridl. respecitively. Three names are newly reduced to synonymy: Cephaelis elongata Ridl. to Chassalia bracteata Ridl., Geophila matthewii Ridl. to Mussaenda uniflora Wall. ex G.Don and Psychotria setistipula Ridl. to Ixora patens Ridl.
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L.W. Cayzer & G.T. Chandler

Pittosporum ridleyi (Pittosporaceae), a new name for the ‘rusty-leaved’ pittosporum in Malaysia [Page 397 - Page 404]
The poorly understood ‘rusty-leaved’ pittosporum, Pittosporum ferrugineum W.T.Aiton has been comprehensively revised as part of the ongoing revision of the family Pittosporaceae across its range. Aiton’s Pittosporum ferrugineum s.s. has been found to be a different species to the species currently known as P. ferrugineum in the Malay Peninsula, Borneo and the Andaman Islands (India). Hence the common coastal species in these areas needs a new name and is presented here as Pittosporum ridleyi L.Cayzer & G.Chandler, a new name for an old species.
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S. Bandyopadhyay

Typification of Bauhinia touranensis (Leguminosae: Cercidoideae) [Page 405 - Page 407]
A second-step lectotype and an epitype are designated here for Bauhinia touranensis Gagnep., now Cheniella touranensis (Gagnep.) R.Clark & Mackinder.
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I.M. Turner

Annonaceae of the Asia-Pacific region: names, types and distributions [Page 409 - Page 744]
A list of the Annonaceae taxa indigenous to the Asia-Pacific Region (including Australia) is presented, including full synonymy and typification with an outline of the geographic distribution. Some 1100 species in 40 genera are listed. A number of nomenclatural changes are made. The species of Artabotrys from Java previously referred to as Artabotrys blumei Hook.f. & Thomson is described here as Artabotrys javanicus I.M.Turner, because A. blumei is shown to be the correct name for the Chinese species generally known as A. hongkongensis Hance. The type of Uvaria javana Dunal is a specimen of U. dulcis Dunal. The new combination Uvaria blumei (Boerl.) I.M.Turner based on U. javana var. blumei Boerl. is therefore proposed as the correct name for the species known for many years as U. javana. Other new combinations proposed are Fissistigma parvifolium (Craib) I.M.Turner, Friesodielsia borneensis var. sumatrana (Miq.) I.M.Turner, Sphaerocoryne touranensis (Bân) I.M.Turner and Uvaria kontumensis (Bân) I.M.Turner. The replacement name Sphaerocoryne astiae I.M.Turner is provided for Popowia gracilis Jovet-Ast. Melodorum fruticosum Lour. is reduced to a synonym of Uvaria siamensis (Scheff.) L.L.Zhou et al. Many new lectotypes and neotypes are designated.
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Year of Publication: 2018, Vol. 70 (1)

Date Published 24 May 2018
J. Chen, I.M. Turner, R.M.K. Saunders & D.C. Thomas

Artabotrys scortechinii (Annonaceae): an augmented species description and a new record for Singapore [Page 3 - Page 8]

Artabotrys scortechinii King was recently discovered as a new record for the native flora of Singapore. This poorly known species has been confused with Artabotrys maingayi Hook.f. & Thomson and its fruits and seeds have not been previously described. This paper presents an augmented description, including its fruit morphology and diagnostic floral characters, which distinguish it from its congeners. A key to the native Artabotrys R.Br. species in Singapore is provided.

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I.M. Turner

Notes on the genus Uncaria (Rubiaceae) in Singapore [Page 9 - Page 12]
Records for the presence of three hitherto overlooked species of Uncaria Schreb., U. borneensis Havil., U. canescens Korth. and U. elliptica R.Br. ex G.Don, in Singapore are presented. Recent collections of three other species, Uncaria acida (W.Hunter) Roxb., U. callophylla Blume ex Korth. and U. roxburghiana Korth., provide evidence of the continued existence of these species in Singapore that were thought to be extinct locally.
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D.J. Middleton, H.K. Lua & P.K.F. Leong

Micrechites lancifolia (Apocynaceae: Apocynoideae), a new record for Singapore [Page 13 - Page 17]
Micrechites lancifolia (Hook.f.) D.J.Middleton & Livsh. is newly recorded for Singapore. A description and provisional conservation assessment are provided.
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S.K. Ganesan, H.K. Lua & Ali Ibrahim

Shorea johorensis (Dipterocarpaceae), an addition to the flora of Singapore [Page 19 - Page 23]
A new distributional record to Singapore of Shorea johorensis Foxw. (Dipterocarpaceae) is described and illustrated. This species is known from remnant lowland dipterocarp forest in the Central Catchment Nature Reserve, Singapore. Notes on distribution, ecology and conservation status are given. This species is assessed as critically endangered for Singapore.
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S.K. Ganesan, H.K. Lua & Ali Ibrahim

Melochia umbellata (Malvaceae subfam. Byttnerioideae), a new record for Singapore [Page 25 - Page 31]
A new distributional record to Singapore of Melochia umbellata (Houtt.) Stapf is described and illustrated. This name is lectotypified. Notes on distribution, ecology and
conservation status are given. This species is assessed as critically endangered for Singapore. A key is given for the two Melochia L. species occurring in Singapore.
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B.C. Ho, H.K. Lua, P.K.F. Leong, S. Lindsay, W.W. Seah, Bazilah Ibrahim, A.H.B. Loo, S.L. Koh, Ali Ibrahim & P. Athen

New records and rediscoveries of vascular plants in Bukit Timah Nature Reserve, Singapore [Page 33 - Page 55]
Several new records of plant species previously unknown in Singapore are reported, along with records of species presumed to be nationally extinct which have been rediscovered. These reports are based on specimens collected during our recent surveys of the Bukit Timah Nature Reserve and previously unreported older specimens, all deposited in SING. Three species are reported as new records for Singapore: Scindapsus lucens Bogner & P.C.Boyce, Passiflora quadriglandulosa Rodschied and Tectaria nayarii Mazumdar. Scindapsus lucens is likely to be native and previously overlooked, whereas Passiflora quadriglandulosa and Tectaria nayarii are exotic species which have escaped from cultivation and become naturalised. Another 10 species are rediscoveries of taxa previously considered to be nationally extinct: Aglaia palembanica Miq., Bolbitis sinuata (C.Presl) Hennipman, Calamus ornatus Blume, Claoxylon longifolium (Blume) Endl. ex Hassk., Dapania racemosa Korth., Dioscorea kingii R.Knuth, Ficus rosulata C.C.Berg, Lasianthus reticulatus Blume, Ryparosa hullettii King and Senegalia kekapur (I.C.Nielsen) Maslin, Seigler & Ebinger.
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M.S. Khoo, S.C. Chua & S.K.Y. Lum

An annotated list of new records for Singapore: results from large-scale tree surveys at the Bukit Timah Nature Reserve [Page 57 - Page 65]
We report new records for Singapore of 16 tree species discovered between 1993 and 2008 during large-scale surveys of Bukit Timah Nature Reserve. These species are: Aglaia crassinervia Kurz ex Hiern (Meliaceae), Alphonsea johorensis J.Sinclair (Annonaceae), Dacryodes nervosa (H.J.Lam) Leenh. (Burseraceae), Dehaasia cuneata (Blume) Blume (Lauraceae), Drypetes crassipes Pax & K.Hoffm. (Putranjivaceae), Dysoxylum grande Hiern (Meliaceae), Endiandra maingayi Hook.f. (Lauraceae), Gluta malayana (Corner) Ding Hou (Anacardiaceae), Hopea ferruginea Parijs (Dipterocarpaceae), Lepisanthes fruticosa (Roxb.) Leenh. (Sapindaceae), Mangifera gracilipes Hook.f. (Anacardiaceae), Neoscortechinia philippinensis (Merr.) Welzen (Euphorbiaceae), Palaquium impressionervium Ng (Sapotaceae), Sindora echinocalyx Prain (Fabaceae), Terminalia citrina (Gaertn.) Roxb. (Combretaceae) and Vatica odorata (Griff.) Symington subsp. odorata (Dipterocarpaceae). Voucher specimens have been deposited in SING.
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R.C.J. Lim, S. Lindsay, D.J. Middleton, B.C. Ho, P.K.F. Leong, M.A. Niissalo, P.C. van Welzen, H.-J. Esser, S.K. Ganesan, H.K. Lua, D.M. Johnson, N.A. Murray, J. Leong-Škorničková, D.C. Thomas & Ali Ibrahim

New records and rediscoveries of plants in Singapore [Page 67 - Page 90]

The city-state of Singapore continues to provide many new records and rediscoveries of plant species in its nature reserves, offshore islands and secondary forests. Eleven new records for Singapore and eight rediscoveries of species previously presumed nationally extinct are reported here along with national conservation assessments. The new records are Albertisia crassa Forman, Arcangelisia flava (L.) Merr., Chaetocarpus castanocarpus (Roxb.) Thwaites, Dendrokingstonia nervosa (Hook.f. & Thomson) Rauschert, Dipterocarpus chartaceus Symington, Haplopteris sessilifrons (Miyam. & H.Ohba) S.Linds., Hewittia malabarica (L.) Suresh, Phyllanthus reticulatus Poir., Spermacoce parviceps (Ridl.) I.M.Turner, Sphaeropteris trichodesma (Scort.) R.M.Tryon and Uvaria micrantha (A.DC.) Hook.f. & Thomson. The rediscoveries are Callerya dasyphylla (Miq.) Schot, Cocculus orbiculatus (L.) DC., Lecananthus erubescens Jack, Loeseneriella macrantha (Korth.) A.C.Sm., Mapania squamata (Kurz) C.B.Clarke, Plagiostachys lateralis (Ridl.) Ridl., Scolopia macrophylla (Wight & Arn.) Clos and Spatholobus maingayi Prain ex King.

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L.M.J. Chen, B.C. Ho, L.M. Choo & S.L. Koh

Additions to the Flora of Singapore, new and overlooked records of naturalised plant species (1) [Page 91 - Page 101]
Nine species of plants that are casual or have become naturalised are newly recorded for Singapore. Six of these are weeds assumed to have only recently arrived in Singapore: Cuscuta campestris Yunck., Clidemia capitellata (Bonpl.) D.Don, Decalobanthus peltatus (L.) A.R.Simões & Staples, Erigeron bellioides DC., Justicia comata (L.) Lam., Mecardonia procumbens (Mill.) Small. The remaining three have been in Singapore for some time but have been previously overlooked: Pseudelephantopus spicatus (Juss. ex Aubl.) C.F.Baker, Praxelis clematidea R.M.King & H.Rob and Spigelia anthelmia L.
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A.R. Rafidah, A.R. Ummul-Nazrah & M.A. Mohd Hairul

Exacum tenue (Gentianaceae), a new record from karst limestone in Peninsular Malaysia [Page 103 - Page 108]
The mycoheterotropic species, Exacum tenue (Blume) Klack. (Gentianaceae), was recently discovered on a limestone hill in Kelantan, Malaysia. A detailed description of the species together with a botanical drawing and colour photographs are provided.
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R. Kiew

One new species and two new records of Jasminum (Oleaceae) in Peninsular Malaysia [Page 109 - Page 118]
Jasminum ledangense Kiew is a new species restricted to Gunung Ledang, Johor and Jasminum carissoides Kerr and J. nervosum Lour. are new records for Malaysia. Jasminum carissoides is restricted to limestone in Kedah (Langkawi) and Perlis and also occurs in Peninsular Thailand, while a narrow-leaved form of J. nervosum is found on limestone in Kedah (Langkawi). Jasminum insularum Kerr is confirmed as a distinct species. It is extremely rare and known from just three specimens, the type from Peninsular Thailand, one from Kelantan and another from Pahang in Malaysia. Descriptions are provided for these species.
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S. Lindsay

Adiantum alleniae, a new species, and Adiantum siamense, a new record, for Peninsular Malaysia [Page 119 - Page 122]
A new fern species, Adiantum alleniae S.Linds., is described from Peninsular Malaysia and Adiantum siamense Tagawa & K.Iwats. is reported from Peninsular Malaysia for the first time.
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O. Popelka, M. Dančák, R.S. Sukri & F. Metali

Novitates Bruneienses, 10. Filmy ferns (Hymenophyllaceae) of Kuala Belalong, Brunei Darussalam [Page 123 - Page 154]
The filmy ferns (Hymenophyllaceae) of Kuala Belalong in Brunei Darussalam are enumerated along with morphological descriptions and short notes on ecology and distribution. Determination keys to each group are included. In total, 22 species belonging to 6 genera (Hymenophyllum Sm., Crepidomanes C.Presl, Didymoglossum Desv., Abrodictyum C.Presl, Cephalomanes C.Presl and Callistopteris Copel.) were identified in the field and in herbaria, the majority of them being epiphytic. Two of the species, namely Crepidomanes grande (Copel.) Ebihara & K.Iwats. and Didymoglossum motleyi (Bosch) Ebihara & K.Iwats., have not previously been recorded from Brunei Darussalam.
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R. Kiew, S. Julia, C.Y. Ling, A. Randi, D. Girmansyah & M. Hughes

Taxonomic status of Begonia promethea (sect. Petermannia, Begoniaceae) in Borneo [Page 155 - Page 161]
The rediscovery of Begonia promethea Ridl. for the first time since its description in 1906 led to the discovery that the later described B. beccarii Warb. is synonymous with it and that it belongs in Begonia sect. Petermannia. It is a rare, endangered species known only from three localities, two locations from the Kuching Division, Sarawak, Malaysia and another one from West Kalimantan, Indonesia. A detailed, illustrated description and a distribution map of Begonia promethea are provided. We suggest an IUCN conservation category of EN B2ab(iii). Lectotypes for both names are designated.
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D.C. Thomas, A. Bour & W.H. Ardi

Begonia of the Matarombeo karst, Southeast Sulawesi, Indonesia, including two new species [Page 163 - Page 176]
Based on collections from the Matarombeo limestone mountain range in Southeast Sulawesi, Indonesia, the two new species Begonia balgooyi D.C.Thomas & Ardi and B. matarombeoensis D.C.Thomas & Ardi are described and illustrated, and an amended description and a photo plate of B. watuwilensis Girm. are provided. These species are restricted to limestone habitats and endemic to Southeast Sulawesi. Provisional conservation assessments indicate an Endangered (EN) status for all three species.
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C.-W. Chen, S. Lindsay, C.M. Mynssen, L.-Y. Kuo, V.B. Amoroso & Y.-M.

A new Haplopteris species from the Philippines and clarification of the status of H. amboinensis [Page 177 - Page 190]
A new fern species from the Philippines, Haplopteris mindanaoensis S.Linds. & C.W.Chen, is described and illustrated based on the results of detailed morphological comparison and molecular phylogenetic analysis. Morphologically, Haplopteris mindanaoensisis characterised by having obovoid (rather than funnel-shaped) soral paraphyses and deep soral grooves with asymmetrical flaps. Analysis of a combined four gene (chlL, matK, ndhF, and trnL-F) plastid data set shows that: (1) the two included samples of Haplopteris mindanaoensis have the same distinct haplotype; (2) Haplopteris mindanaoensis diverges early within the clade where most species with marginal soral grooves are placed; and (3) Haplopteris heterophylla C.W.Chen, Y.H.Chang & Yea C.Liu, the only other Haplopteris C.Presl species known to have obovoid paraphyses, is not closely related to H. mindanaoensis. The status of Haplopteris amboinensis (Fée) X.C.Zhang in China and Indochina is also clarified and a new combination, H. ensata (Christ) C.W.Chen & S.Linds. is made.
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A. Retnowati

The species of Marasmiellus (Agaricales: Omphalotaceae) from Java and Bali [Page 191 - Page 258]
A total of 35 species of Marasmiellus Murrill belonging to five sections (DealbatiRameales, Marasmiellus, Stenophylloides, and Candidi) are described from Java and Bali. Sixteen taxa are described as new species: Marasmiellus bisporus Retn., M. cibodasensis Retn., M. cikanikiensis Retn., M. clavatus Retn., M. desjardinii Retn., M. diverticulatus Retn., M. haurbentesis Retn., M. javanicus Retn., M. longisiccus Retn., M. pipericola Retn., M. pruinosus Retn., M. reniformis Retn., M. rifaii Retn., M. subglobosus Retn., M. tamblinganensis Retn. and M. zingibericola Retn. Two new combinations are made: M. nugatorius (Corner) Retn. and M. pangerangensis (Henn.) Retn. Comprehensive descriptions, illustrations, and comparisons with similar taxa are presented. Eight names are lectotypified.
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Nigel P. Taylor

BOOK REVIEW [Page 259 - Page 259]
Book Review:
Tropical Forest Scientist. Francis S.P. Ng and FRIM 1964–1991.
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Year of Publication 2018, Vol. 70 (Supplement 1)

Date Published 20 March 2018
G.W.H. Davison, Y. Cai, T.J. Li & W.H. Lim
Integrated research, conservation and management of Nee Soon freshwater swamp forest, Singapore: hydrology and biodiversity [Page 1 - Page 7]

The current paper acts as an introduction to nine following papers concerning the hydrology and biodiversity of Nee Soon freshwater swamp forest. Freshwater swamp forest is a threatened and overlooked ecosystem in the Southeast Asian region and in Singapore. Characterised by predominantly mineral soils supporting forest that contains a subset of flora  and fauna of lowland forest, but with the addition of important habitat specialists, freshwater swamp forest is fed by an array of hydrological processes. As conservation management depends on good hydrological and biological understanding, a research programme was designed to tease out the roles of the various hydrological components. The background, management concerns, and aims of the project are detailed.

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E. Clews, R.T. Corlett, J.K.I. Ho, D.E. Kim, C.Y. Koh, S.Y. Liong, R. Meier, A. Memory, S.J. Ramchunder, T.M. Sin, H.J.M.P. Siow, Y. Sun, H.H. Tan, S.Y.Tan, H.T.W. Tan, M.T.Y. Theng, R.J. Wasson, D.C.J. Yeo & A.D. Ziegler
The biological, ecological and conservation significance of freshwater swamp forest in Singapore [Page 9 - Page 31]

The Nee Soon stream drainage in the Central Catchment Nature Reserve is virtually the last remaining fragment of primary freshwater swamp forest in Singapore. The forest type has been poorly studied in the Southeast Asia. The hydrology, water quality, as well as aquatic flora and fauna all have great theoretical and practical significance. The ecology and management of the Nee Soon freshwater swamp forest are reviewed, with remarks on their national, regional and global contexts. This review sets the scene for a three-year integrated conservation and management study completed in 2016.

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C.T.T. Nguyen, R.J. Wasson & A.D. Ziegler
The hydro-geomorphic status of Nee Soon freshwater swamp forest catchment of Singapore [Page 33 - 48]

This paper presents initial findings from research on the hydro-geomorphic status of Nee Soon freshwater swamp forest catchment in Singapore. The hydrological system of Nee Soon contains a swamp that is best described as an organic-rich wetland, with organic matter content as high as 40% near the surface (too low to be classified as peat). Total longterm denudation rate in the catchment is an estimated 23.4 ± 2.08 Mg km-2 yr-1, with physical erosion (5.6 ± 0.5 Mg km-2 yr-1) and chemical weathering (17.8 ± 1.58 Mg km-2 yr-1) accounting for 24% and 76% of the totals, respectively. Age dating of a 1.95-m sediment core from the lower swamp indicates several distinct periods of variable sediment deposition (0.04 to 0.009 cm y-1) since 15,000 BCE, across a variety of climate regimes. A missing layer, representing more than a 7000 year period, verifies substantial channel erosion in the swamp occurring since 1950. Accelerated erosion associated with forest conversion to agriculture in the upper catchment could not be verified through examination of sediment cores. High concentrations of several heavy metals (e.g. As, Cr, Mn, Ni, Sr, V) in the lower catchment, compared with the upper catchment, appear to be natural (e.g. related to differences in the underlying bedrock), rather than contamination. The very high concentrations of lead, copper, and zinc associated with firing activities in the military range in the lower catchment are spatially isolated (e.g. shooting berms), and currently not posing a threat to the swamp environment. Other hydrogeomorphic degradation processes/activities now include disruption to hillslope soils and streams by trampling and mountain biking, back-flow of reservoir release water into the lower swamp area, and atmospheric deposition of contaminants.

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K.Y. Chong, R.C.J. Lim, J.W. Loh, L. Neo, W.W. Seah, S.Y. Tan & H.T.W. Tan
Rediscoveries, new records, and the floristic value of the Nee Soon freshwater swamp forest, Singapore [Page 49 - 69]

The unique plant communities of the freshwater swamp forests of southern Johor (Malaysia) and Singapore attracted the attention of E.J.H. Corner, but there have been no comprehensive follow-up studies to his seminal work. Meanwhile, freshwater swamp forests in the region have been mostly lost to logging and in-filling for plantations or urban development. The Nee Soon catchment contains the last substantial tract of this forest type in Singapore. We collated the rediscoveries of vascular plant species presumed Nationally Extinct in the 2nd and latest edition of the Singapore Red Data Book, and new records for the Singapore vascular plant flora from the Nee Soon catchment, including those that we found and collected through the establishment and survey of 40 vegetation plots, each 20 × 20 m. We have identified 672 species from 117 families, of which 288 are trees from 60 families represented by at least one stem ≥ 5 cm DBH. The catchment is especially species rich and abundant in the Myristicaceae. In the last ten years, 53 rediscoveries, 11 new species records, and two new varietal records have been uncovered from (or can be found in) the Nee Soon catchment. The Nee Soon freshwater swamp forest is one of Singapore’s most valuable botanical areas, and warrants sustained conservation effort and study.

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J.K.I. Ho, R.F. Quek, S.J. Ramchunder, A. Memory, M.T.Y Theng, D.C.J. Yeo & E. Clews
Aquatic macroinvertebrate richness, abundance and distribution in the Nee Soon freshwater swamp forest, Singapore [Page 71 - 108]

The Nee Soon freshwater swamp forest is a vital area for biodiversity conservation in Singapore. A survey of the aquatic macroinvertebrates in the streams of the Nee Soon drainage was carried out to capture a representative sample of the communities present. Here, we present the different groups of macroinvertebrates sampled as well as their abundance and distribution within the freshwater swamp forest. An annotated checklist of the orders of the macroinvertebrates found in the freshwater swamp forest follows, together with information on their distribution and abundance within the Nee Soon catchment.

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W.H. Lim, T.J. Li & Y. Cai
Diversity of terrestrial snails and slugs in Nee Soon freshwater swamp forest, Singapore [Page 109 - 121]

Nee Soon freshwater swamp forest is the last remaining primary freshwater swamp forest left in Singapore and it contains a rich diversity of native and locally threatened fauna. As native terrestrial snails and slugs are poorly studied and understood in Nee Soon freshwater swamp forest, an extensive survey was conducted to establish their current status. A total of 19 species was recorded, of which one was recorded for Singapore for the first time. Amphidromus atricallosus temasek, a recently described subspecies endemic to Singapore, was found to be more commonly distributed than previously known from the swamp forest. Results also indicate that despite low overall abundance, Nee Soon freshwater swamp forest harbours a rich diversity of land snails and slugs. Any future long term changes in climate or topography, or short term changes in hydrology, might affect their distribution and diversity.

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Y. Cai, C. Y. Ng & R.W.J. Ngiam
Diversity, distribution and habitat characteristics of dragonflies in Nee Soon freshwater swamp forest, Singapore [Page 123 -153]

Biodiversity baselines were established for dragonflies of Nee Soon freshwater swamp forest based on quantitative sampling across the eight sub-catchments. Surveys were conducted from December 2014 to April 2016. Hydrological, physiochemical parameters and habitats were analysed to identify the main drivers structuring the dragonfly community. A total of 1706 odonate specimens were recorded, comprising 49 species of 34 genera in 11 families. The species diversity in each sub-catchment was compared using the Shannon-Wiener Index (H’). Hierarchical clustering and Detrended Correspondence Analysis (DCA) indicated that three main groupings of sites existed, each with a distinct community of associated species. Further analysis by Canonical Correspondence Analysis (CCA) with 12 significant environmental variables showed that these groups were significantly associated with respective environmental variables. Principal Components Analysis (PCA) was performed to analyse the full 23 environmental variables. The first four principal components of the PCA explained 63% of the variation in all the environmental variables. These four axes were input as independent variables into an Ordinary Least Square (OLS) model to test the significance of the link between habitat characteristics and diversity of the dragonfly community. Threats to the odonate fauna of the freshwater swamp forest are identified and conservation management measures are discussed.

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S.N. Kutty, W. Wang, Y. Ang, Y.C. Tay, J.K.I. Ho & R.Meier
Next-Generation identification tools for Nee Soon freshwater swamp forest, Singapore [Page 155 - 173]

Many invertebrate and plant species are difficult to identify even by taxonomic experts. This has created a major obstacle for understanding the ecology of tropical environments. Here we explore the use of new large-scale, cost-effective approaches to species identification using Next-Generation Sequencing (“DNA barcodes”). Due to the rapid drop in sequencing cost, such barcodes have the potential to help with many identification tasks and they will facilitate regular monitoring of habitats. We use this approach to explore the species diversity of Nee Soon freshwater swamp forest and provide taxonomic identification tools for the fauna and flora of the forest. DNA-barcode libraries were generated for the flora (>1000 barcodes; 170 chloroplast genomes) and fauna (ca. 3000 barcodes). In addition, highresolution images of 502 animal and 200 plant species were placed on an online image database (“Biodiversity of Singapore”). These images are available to help experts and non-experts alike to identify and appreciate these species. The new databases document Nee Soon’s impressive diversity, but they are also important for in-depth studies of fauna-floral species interactions. For example, the plant barcodes were used to reconstruct the diet of Raffles’ banded langur based on faecal samples. Overall, we find that the fauna in Nee Soon freshwater swamp forest is very diverse and includes many rare species, and that the species composition is very distinct from those living in surrounding habitats. Animal specimens are readily sequenced, while plant specimens (especially those represented by sapwood samples) remain a challenge. However, newer techniques (e.g. based on genome skimming) are starting to help with obtaining plant DNA-barcodes.

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Y. Sun, D.E. Kim, D. Wendi, D.C.Doan, S.V.Raghavan, Z. Jiang & S.Y. Liong
Projected impacts of climate change on stream flow and groundwater of Nee Soon freshwater swamp forest, Singapore [Page 175 - 190]

As Singapore’s only remaining patch of primary freshwater swamp forest, the good management of the Nee Soon catchment is of utmost importance if a large proportion of the flora and fauna in Singapore is to be conserved. An integrated eco-hydrological model is developed for the area, with the objectives to numerically model the hydrological variations, to assess the possible impacts of future climate change, and to facilitate future ecohydrological management. The numerical model considers the hydrological processes in a holistic manner, including rainfall-runoff, evapotranspiration, the interaction between surface water and groundwater, etc. The numerical model makes use of a combination of field survey data and alternative remote sensing data. With climate projection inputs from the Regional Climate Model (RCM), the numerical model is applied to run future scenarios to assess the climate change impact. A few management strategies are considered if favourable hydrological conditions are to be maintained for conserving the local ecosystem.

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Y. Cai, G.W.H. Davison, L. Chan & S.Y. Liong
Conservation outputs and recommendations for Nee Soon freshwater swamp forest, Singapore [Page 191 - 217]

The current paper acts as a summary to the “Nee Soon Swamp Forest biodiversity and hydrology baseline studies project”, including results published previously and the results from papers of the current volume. Overall, flora and fauna surveys indicate healthy and diverse plant, fish and aquatic macroinvertebrate communities in Nee Soon freshwater swamp forest. There are some concerns over terrestrial and aquatic alien invasive species, loss of big emergent trees, small population sizes and viability of various native species, and the uncertain outcomes of changes in water quality and quantity. The findings inform management that Nee Soon freshwater swamp forest is especially vulnerable to changes in hydrology and there is much dependency on precipitation for its water budget. Projected climate change effects on precipitation and statistical analyses of biotic responses to hydrology clearly define drought as a major, perhaps the foremost, source of vulnerability to the ecosystem functioning of Nee Soon freshwater swamp forest. Potential management solutions are suggested to address five issues of concern for the forest: hydrological integrity, erosion and sedimentation, ecological integrity, the impact of the spillway, and impacts of construction and development.

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Year of Publication: 2017, Vol. 69 (2)

Date Published 20 November 2017
M.A. Niissalo & J. Leong-Škorničková
Hanguana podzolicola (Hanguanaceae), a new record for Singapore [Page 157 - 165]
Hanguana podzolicola (Hanguanaceae) is newly recorded for Singapore. Detailed colour plates are given alongside the main characters for distinguishing this species from the two most similar species in Singapore, Hanguana rubinea and H. triangulata. The seeds of Hanguana podzolicola are described for the first time. A local conservation assessment is given. As no original material of Hanguana podzolicola could be traced, a neotype is designated here. Following a recent clarification of several historical Hanguana names it is noted here that the correct name for the large helophytic stoloniferous species often cultivated in Singapore under the name Hanguana malayana is Hanguana anthelminthica. An updated key to Hanguana species in Singapore is provided.

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R.P.J. de Kok
Two new records of Litsea (Lauraceae) from Singapore and the lectotypification of twenty-two names from several Lauraceae genera [Page 167 - 177]
Two species of Litsea (Lauraceae) are recorded for Singapore for the first time (Litsea spathacea Gamble and L. tomentosa Blume). Both species are known only from 19th century specimens and must be considered nationally extinct in Singapore. Descriptions and notes on distribution, conservation status and ecology are given. In addition, twenty-two Lauraceae names are lectotypified: Beilschmiedia curtisii Gamble, B. perakensis Gamble; Cinnamomum subavenium Miq.; Cryptocarya argentea Gamble, C. infectoria (Blume) Miq., C. tomentosa Blume; Lindera lucida (Blume) Boerl., L. malaccensis Hook.f.; Litsea accedens (Blume) Boerl., L. amara Blume var. attenuata Gamble, L. gracilis Gamble, L. gracilipes Hook.f., L. griffithii Gamble, L. lanceolata (Blume) Kosterm., L. machilifolia Gamble, L. machilifolia Gamble var. angustifolia Gamble, L. megacarpa Gamble, L. pustulata Gamble, L. sarawacensis Gamble, L.singaporensis Gamble, L. spathacea Gamble, L. umbellata (Lour.) Merr.

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M. Dančák, M. Hroneš, R.S. Sukri, F. Metali & A.A. Joffre
Novitates Bruneienses, 9. A synopsis of Epirixanthes (Polygalaceae) in Brunei Darussalam and notes on species elsewhere [Page 179 - 187]
The genus Epirixanthes Blume is revised for Brunei Darussalam. Four species are recognised for the country: Epirixanthes cylindrica Blume, E. elongata Blume, E. kinabaluensis T.Wendt and E. papuana J.J.Sm., with the two latter species being newly recorded for the Brunei flora. A single collection from Brunei that was formerly identified as Epirixanthes pallida T.Wendt is now confirmed as E. papuana. A revised key for the genus is included.

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M. Ardiyani, M.F. Newman & A.D. Poulsen
A new species of Zingiber (Zingiberaceae) east of Wallace’s Line [Page 189 - 199]
Zingiber Mill. is distributed from India to the Pacific but only a few species are known from east of Wallace’s Line, whereas the area to the west is rich in species. A recent collection from limestone at Bantimurung, South Sulawesi, Indonesia represents a new eastern species, Zingiber ultralimitale Ardiyani & A.D.Poulsen, which is described, illustrated, and barcoded using three of the four barcoding loci (rbcL, trnH-psbA and ITS). Placement of this species using morphological evidence is ambiguous but a combination of evidence from morphology, pollen anatomy and molecular analysis indicates that it belongs to Zingiber sect. Zingiber.

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G.G. Hambali, S. Sunarti & Y.W. Low
Syzygium jiewhoei (Myrtaceae), a new endemic tree from Western New Guinea, Indonesia [Page 201 - 210]
Syzygium jiewhoei Hambali, Sunarti & Y.W.Low, a new species from Western New Guinea, Indonesia, is described and illustrated. It is closely related to Syzygium recurvovenosum (Lauterb.) Diels but differs in a range of vegetative and reproductive morphological characteristics.

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C. Puglisi & D.J. Middleton
A revision of Microchirita (Gesneriaceae) in Thailand [Page 211 - 284]
Microchirita (C.B.Clarke) Yin Z.Wang (Gesneriaceae: Didymocarpoideae) in Thailand is revised and 29 species are recognised, two of which have three varieties each. Eight new species are described, Microchirita albocyanea C.Puglisi, Microchirita glandulosa C.Puglisi, Microchirita hypocrateriformis C.Puglisi, Microchirita limbata C.Puglisi, Microchirita luteola C.Puglisi, Microchirita tadphoensis C.Puglisi, Microchirita tetsanae C.Puglisi, Microchirita thailandica C.Puglisi; three new varieties are described, Microchirita involucrata var. gigantiflora C.Puglisi, Microchirita mollissima var. glabra C.Puglisi, Microchirita mollissima var. glandulophylla C.Puglisi; and one name is combined at a new rank, Microchirita involucrata var. capitis (Craib) C.Puglisi. Two lectotypifications are made, one of which is a second step lectotypification. A key to all taxa is given, all taxa are described, and many are illustrated.

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W.H. Chen, D.J. Middleton, H.Q. Nguyen, H.T. Nguyen, L.V. Averyanov, R.Z. Chen, K.S. Nguyen, M. Möller & Y.M. Shui
Two new species of Oreocharis (Gesneriaceae) from Northwest Vietnam [Page 295 - 305]
Two new species of Oreocharis (Gesneriaceae), O. argyrophylla W.H.Chen, H.Q.Nguyen & Y.M.Shui and O. blepharophylla W.H.Chen, H.Q.Nguyen & Y.M.Shui, from the Xuan Nha nature reserve, Van Ho district, Son La province, in northwestern Vietnam are described. They are compared to their most similar species and diagnostic characteristics are provided.

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S. Li, Z.B. Xin, X. Hong, L.F. Fu & F. Wen
Primulina wuae (Gesneriaceae), a new species from southern China [Page 307 - 313]
A new species, Primulina wuae F.Wen & L.F.Fu (Gesneriaceae), is described from the southern part of China. This new species is most similar to Primulina pseudoroseoalba Jian Li et al., P. roseoalba (W.T.Wang) Mich.Möller & A.Weber, P. subrhomboidea (W.T.Wang) Yin Z.Wang and P. beiliuensis B.Pan & S.X.Huang var. fimbribracteata F.Wen & B.D.Lai, but differs from these in characters such as the size and indumentum of the bracts, the indumentum of the pedicels and anthers, the length of the pistils etc. A provisional conservation assessment is also provided.

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Year of Publication: 2017, Vol. 69 (1)

Date Published 24 May 2017
A.R. Rafidah
Taxonomy and conservation status of Microchirita (Gesneriaceae) in Peninsular Malaysia [Page 1 - 31]
A revision of Microchirita (C.B.Clarke) Yin Z.Wang (Gesneriaceae) in Malaysia is presented as a precursory paper for the Flora of Peninsular Malaysia account. The taxonomic treatment includes a key for identification, detailed descriptions of the species, information on seed morphology (illustrated by Scanning Electron Microscopy micrographs), and a discussion on distributions, including maps, and the conservation status for each species.

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M. Rodda
Index of names and types of Hoya (Apocynaceae: Asclepiadoideae) of Borneo [Page 33 - 65]
Types of all Hoya species occurring in Borneo and their synonyms are indicated and clarified. Forty-six lectotypes, nine neotypes and five epitypes are designated.

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Y.W. Low, A.K. Muhammad Ariffin, A.A. Joffre & D. Duratul Ain
Novitates Bruneienses, 8. Macrosolen brunsing (Loranthaceae), a new hemiparasitic shrub from Brunei Darussalam [Page 67 - 73]
Macrosolen brunsing Y.W.Low & Ariffin is described and illustrated here as a new species of aerial hemiparasite based on two collections from the Ladan Hills Forest Reserve, Tutong, Brunei Darussalam. The new species differs from all Macrosolen taxa enumerated in Borneo by its distinct linear leaves ((4–)8–14.5 cm long, 0.1–0.2(–0.25) cm wide).

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I. Haerida
Liverworts of Bali, Indonesia, with new records to the island [Page 81 - 87]
A total of 72 species of liverworts have been found in Bali. Based on recent collections and former records of the species including 31 genera and 17 families, among them, 43 species are new to Bali.

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C.-W. Lin, D.C. Thomas, W.H. Ardi & C.-I Peng
Begonia ignita (sect. Petermannia, Begoniaceae), a new species with orange flowers from Sulawesi, Indonesia [Page 89 - 95]
Begonia ignita C.W.Lin & C.I Peng, a new species of Begonia sect. Petermannia from Sulawesi, Indonesia, is here described and illustrated. It is distinct from other species in Begonia section Petermannia by a character combination including a procumbent stem ascending only at the apex, symmetric or subsymmetric leaves, the presence of a pale band or maculation running parallel to the leaf margin, and orange tepals. A detailed comparison with a morphologically similar species, the Sulawesi endemic Begonia mendumiae M.Hughes, is provided.

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N. Simonsson Juhonewe & M. Rodda
Contribution to a revision of Hoya (Apocynaceae: Asclepiadoideae) of Papuasia. Part I: ten new species, one new subspecies and one new combination [Page 97 - 147]
The large majority of Hoya R.Br. species known from Papuasia were described in the first half of the 20th century and most of these are endemic. Along with Borneo and the Philippines the region is a centre of diversity of the genus. Since 2006 herbarium materials have been studied for a revision of Hoya of New Guinea along with field investigations on Papuasian Hoya since 2010. In the present paper we publish ten new species, Hoya brassii P.I.Forst. & Liddle ex Simonsson & Rodda, H. carrii P.I.Forst. & Liddle ex Simonsson & Rodda, H. edholmiana Simonsson & Rodda, H. evelinae Simonsson & Rodda, H. juhoneweana Simonsson & Rodda, H. krusenstierniana Simonsson & Rodda, H. koteka Simonsson & Rodda, H. stenakei Simonsson & Rodda, H. versteegii Simonsson & Rodda and H. yvesrocheri Simonsson & Rodda, one subspecies, H. juhoneweana ssp. lindforsiana Simonsson & Rodda, and make one new combination, H. urniflora (P.I.Forst.) Simonsson & Rodda, which is also lectotypified.

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S. Lindsay, P.H. Hovenkamp & D.J. Middleton
New combinations and typifications in Aglaomorpha (Polypodiaceae) [Page 149 - 155]
In preparation for a new checklist of Singaporean plants, the Flora of Singapore project, and the Ferns of Thailand, Laos and Cambodia website, new combinations in Aglaomorpha Schott are made to accommodate species formerly placed in Drynaria (Bory) J.Sm. and Christiopteris Copel. Ten names are lectotypified, seven of which are second step lectotypifications, and one name is neotypified.

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