Thai Forest Bulletin (Botany) <p>Thai Forest Bulletin (Botany)&nbsp;- here referred to as TFB (Botany) -&nbsp;was first published in 1954 by the Royal Forest Department, under the leadership of its first editor Prof. Dr. Tem Smitinand. In 2002, the journal was published by the Department of National Parks, Wildlife and Plant Conservation with Prof. Dr. Thawatchai Santisuk as editor, supported by editorial board members from several prominent herbaria in Europe. At present, the TFB (Botany) is published by the Forest Herbarium in Bangkok, with Dr. Rachun Pooma and Dr. Tim Utteridge as editors. The journal is published once a year, usually in September-December with the manuscript no submission deadline, and articles are published in English. All manuscripts are peer reviewed by international scientists and edited by native English language speakers on the editorial board before acceptance and publication.&nbsp;TFB (Botany) will become both printed and electronic journal starting with volume 44 (2016), and through the TFB (Botany) Archive, every article published since 1954 is available and completely searchable online.</p> <p>ISSN : 0495-3843&nbsp;(print), 2465-423x (electronic)</p> Forest Herbarium (BKF) en-US Thai Forest Bulletin (Botany) 0495-3843 Obituary: Prof. Dr Thawatchai Santisuk (1944–2020) Kongkanda Chayamarit David A. Simpson Copyright (c) 2020 Forest Herbarium 2020-11-18 2020-11-18 48 2 i i 10.20531/tfb.2020.48.2.ob Two new species of Pittosporum (Pittosporaceae) for the Flora of Thailand <p>Two new species of <em>Pittosporum </em>(Pittosporaceae) are reported for Thailand. <em>Pittosporum lacrymasepalum </em>from Trat Province and <em>P. maxwellii </em>from Doi Inthanon, Chiang Mai Province are described and illustrated.</p> Timothy M.A. Utteridge Copyright (c) 2020 Forest Herbarium 2020-07-09 2020-07-09 48 2 87 94 10.20531/tfb.2020.48.2.01 Psammosilene tunicoides (Caryophyllaceae) a new generic and species record for Thailand <p><em>Psammosilene tunicoides</em>, a new generic and species record for Thailand, is reported. The new record was discovered on a degraded calcareous substrate mountain in the western part of Thailand near the Thai-Myanmar border. The species was previously reported to be endemic to SW China. This occurrence in Thailand greatly extends the distribution of the species. A lectotype is designated here.</p> Somran Suddee Thamarat Phutthai Naiyana Tetsana Theerawat Thananthaisong Wittawat Kiewbang Copyright (c) 2020 Forest Herbarium 2020-07-13 2020-07-13 48 2 95 100 10.20531/tfb.2020.48.2.02 New records of the genus Psychotria (Rubiaceae) from Thailand <p>Four species of <em>Psychotria</em> are newly recorded from Thailand: <em>P. bonii</em>, <em>P. griffithii</em>, <em>P. langbianensis</em> and <em>P. pachyphylla</em>. Descriptions and list of synonyms are provided and a lectotype for <em>P. bonii</em> is designated.</p> Teerawat Srisuk Voradol Chamchumroon Pimwadee Pornpongrungrueng Copyright (c) 2020 Forest Herbarium 2020-07-15 2020-07-15 48 2 101 107 10.20531/tfb.2020.48.2.03 Begonia colliculata (Begoniaceae), a new species from Nam Kading National Protected Area, Bolikhamxai province, Laos <p><em>Begonia colliculata</em> is described and illustrated with photographs from Nam Kading National Protected Area, in the Bolikhamxai Province of Laos.</p> Keooudone Souvannakhoummane Soulivanh Lanorsavanh Jeong Ho Park Ho Sang Kang Tai Hyeon Ahn Singkone Xayalath Chanhsamone Phongoudom Copyright (c) 2020 Forest Herbarium 2020-07-24 2020-07-24 48 2 108 113 10.20531/tfb.2020.48.2.04 Heterostemma brownii (Apocynaceae), a new record for Laos and Thailand <p><em>Heterostemma brownii</em> is reported as a new record for the floras of Laos and Thailand. A lectotype is also designated for the name <em>H. brownii</em>. A description based on Thai and Laos collections, photographs and notes are provided.</p> Woranart Thammarong Sarayut Rakarcha Michele Rodda Copyright (c) 2020 Forest Herbarium 2020-07-30 2020-07-30 48 2 114 117 10.20531/tfb.2020.48.2.05 The Cenozoic leaf morphotypes and palaeoclimate interpretation from the Doi Ton Formation, Mae Sot District, Tak Province, western Thailand <p>The Cenozoic palaeovegetation and palaeoclimate of Doi Ton, western Thailand, megaflora are reconstructed based on physiognomic climate analysis, including Leaf Margin Analysis (LMA), Leaf Area Analysis (LAA), Leaf Size Index (LSI), Climate Leaf Analysis Multivariate Program (CLAMP), and systematic descriptions of each leaf morphotype. The leaf fossils were divided into 23 dicotyledonous leaf morphotypes and two unknown leaf morphotypes. The mean annual temperature results from LMA indicate 32.3 ± 1.17 °C and CLAMP shows 21.2°C. CLAMP also provides temperature data of a warm month mean temperature (WMMT) of 27.4 °C and a CMMT of 14.2 °C, which is similar to the present climate. The mean annual precipitation is estimated by LAA to be ~ 125 cm. CLAMP suggests precipitation in the 11 months of growing period was 154.9 cm with the three wettest months having precipitation of 73 cm, widely contrasting with 15.5 cm for the three driest months. The precipitation shows the signal of the monsoon effect. The temperature, precipitation, and LSI mirrored the vegetation of the contemporary Doi Ton area which is a semi-evergreen forest in the tropical zone. The palaeoclimatic parameters of Doi Ton are in good agreement with those of south China and northwest<br>India from the Eocene period and the present-day Mae Sot area. Moreover, the Doi Ton flora also closely matches the humid subtropical modern vegetation of south China. Palaeoclimate and vegetation analysis support an Eocene age estimate for the Doi Ton Formation however further independent age estimates are required to test this working hypothesis.</p> Atiwut Bunlam Yupa Thasod Pitaksit Ditbanjong Rattanaporn Fongngern Paul J. Grote Copyright (c) 2020 Forest Herbarium 2020-08-03 2020-08-03 48 2 118 141 10.20531/tfb.2020.48.2.06 Notes on the typification of five names in Lauraceae <p>This article deals with inadvertent lectotypifications of five names in the Lauraceae, <em>Cryptocarya densiflora</em>, <em>Cryptocarya impressa</em>, <em>Cylicodaphne infectoria</em>, <em>Laurus cubeba</em> and <em>Litsea castanea</em>, that have been previously overlooked.</p> Anand Kumar Copyright (c) 2020 Forest Herbarium 2020-08-22 2020-08-22 48 2 142 144 10.20531/tfb.2020.48.2.07 A synopsis of Thai Piper (Piperaceae) <p>All native and introduced Thai <em>Piper</em> are enumerated to include 46 species and two varieties. Typifications for accepted names and synonyms are made where necessary. Family and generic descriptions, based on Thai collections, are provided. A key to species and varieties and relevant synonymy are also presented. Additional morphological characters for <em>P. smitinandianum</em> are summarised. Data on the distribution, ecology, vernacular names, utilization and collections of each taxon in Thailand are presented in the standard Flora of Thailand format.</p> Chalermpol Suwanphakdee David A. Simpson Trevor R. Hodkinson Pranom Chantaranothai Copyright (c) 2020 Forest Herbarium 2020-08-31 2020-08-31 48 2 145 183 10.20531/tfb.2020.48.2.08 Dimetra (Oleaceae), a new genus record for Lao PDR <p>A monotypic genus <em>Dimetra </em>represented by <em>D. craibiana</em> Kerr known to be endemic to Thailand. Presently, the specimen from Xayaburi Province, Lao PDR are reported as newly discovered for Laos PDR. &nbsp;Detailed description and photographs are provided.</p> Sarayut Rakarcha Charun Maknoi Wattana Tanming Woranart Thammarong Prateep Panyadee Copyright (c) 2020 Forest Herbarium 2020-09-11 2020-09-11 48 2 184 186 10.20531/tfb.2020.48.2.09 Cardamine occulta (Brassicaceae), a new name for the Flora of Thailand <p>The common Thai species of <em>Cardamine</em>, treated as <em>C. hirsuta</em> in the Flora of Thailand, is discussed. The correct name should be<em> C. occulta</em> according to recent publications. New data and collections are added.</p> Hans-Joachim Esser Copyright (c) 2020 Forest Herbarium 2020-09-29 2020-09-29 48 2 187 189 10.20531/tfb.2020.48.2.10 Geraniaceae in Thailand <p>Members of the geranium family (Geraniaceae) native to Thailand are enumerated. Two genera, <em>Geranium</em> (3 species) and <em>Pelargonium</em> (1 species) are recognized. <em>Pelargonium</em> is a new genus record for Thailand and Asia Major (except Asia Minor-Anatolia). Keys to the Thai species, descriptions, information on distribution and ecology, as well as conservation status, are provided.</p> Piyakaset Suksathan Copyright (c) 2020 Forest Herbarium 2020-10-02 2020-10-02 48 2 190 198 10.20531/tfb.2020.48.2.11 Terminalia santisukiana (Combretaceae), a new species from North-Eastern Thailand <p>A new species of <em>Terminalia</em>, <em>T. santisukiana</em> (Combretaceae) from fresh water swamp forest in North-Eastern Thailand is described and illustrated. The new species is similar to <em>Terminalia nigrovenulosa</em>, having similar leaves with glands on the leaf margin near the base and paniculate inflorescences, but it is mainly distinguished by the loose panicles with dense indumentum on the flowers and the 4–5-winged fruits. It is also similar to <em>Terminalia polyantha</em>, having 4–5-winged fruits, but differs by the dense indumentum on the flowers and asymmetrical fruits.</p> Nannapat Pattharahirantricin Manop Poopath Copyright (c) 2020 Forest Herbarium 2020-11-04 2020-11-04 48 2 199 203 10.20531/tfb.2020.48.2.12 Lectotypification of Porpax scaposa (Orchidaceae) <p><em>Porpax scaposa</em> is lectotypified. This species is endemic to northern Thailand, and was based on <em>Garrett 717</em> (BKF, K) when published. We here select the Kew sheet, K000913725, as the lectotype.</p> Santi Watthana Somran Suddee Copyright (c) 2020 Forest Herbarium 2020-11-16 2020-11-16 48 2 204 205 10.20531/tfb.2020.48.2.13 Stemona fimbritepala (Stemonaceae), a new species from northern Laos <p><em>Stemona fimbritepala</em> (Stemonaceae), a new species from northern Laos, is described and illustrated. It is morphologically similar to <em>S. hirtella</em> and <em>S. kerrii</em> but clearly differs in longer peduncle, longer tepals, longer petaloid outgrowth of the connective and fimbriate margin of inner tepals. A detailed description, distribution, ecology, etymology, preliminary conservation status and photographs of this species are provided. A key to discriminate between the three hairy species is presented.</p> Sarayut Rakarcha Wittaya Pongamornkul Woranart Thammarong Charun Maknoi Keooudone Souvannakhoummane Copyright (c) 2020 Forest Herbarium 2020-11-17 2020-11-17 48 2 206 211 10.20531/tfb.2020.48.2.14 Ten new species of Globba section Globba from continental South-East Asia <p>Ten new species of <em>Globba</em> from Thailand and Vietnam are described and illustrated; <em>Globba amnicola</em>, <em>G. amplectens</em>, <em>G. conferta</em>, <em>G. dasycarpa</em>, <em>G. grandis</em>, <em>G. hilaris</em>, <em>G. impar</em>, <em>G. nitida</em>, <em>G. verecunda</em> and <em>G. williamsiana</em>. Distribution maps and IUCN provisional assessments of each species are provided.</p> Sunisa Sangvirotjanapat Trần Hữu Đăng Mark Newman Copyright (c) 2020 Forest Herbarium 2020-11-20 2020-11-20 48 2 212 233 10.20531/tfb.2020.48.2.15 Notes on taxonomy of the genus Argostemma (Rubiaceae) from Vietnam <p><em>Argostemma pictum</em> (Rubiaceae), a species occurring in Myanmar, Thailand, Laos and Peninsular Malaysia, is newly reported for the flora of Vietnam; a description, photographs, information on ecology and taxonomic notes are also presented. In order to facilitate identification, we provide an identification key and checklist to the 10 known <em>Argostemma</em> species in Vietnam.</p> Hai Thi Vu Thanh Trung Nguyen Hung Quang Nguyen Khuong Duy Le Truong Van Do Copyright (c) 2020 Forest Herbarium 2020-12-03 2020-12-03 48 2 234 238 10.20531/tfb.2020.48.2.16