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 A revision of Beilschmiedia (Lauraceae) for Thailand and Indochina <p>A revision of the genus <em>Beilschmiedia</em> (Lauraceae) from Thailand and Indochina is presented with a summary of its taxonomic history, plus keys, full descriptions of each species, distribution maps, conservation assessments, ecological information, ethno-botanical notes and a discussion of its morphology. In this treatment, 21 species are recognized; 14 names are lectotypified (<em>B. argentata</em>, <em>B. balansae</em>, <em>B. balansae</em> var. <em>muticarpa</em>, <em>B. clarkei</em>, <em>B. elegantissima</em>, <em>B. ferruginea</em>, <em>B. globularia</em>, <em>B. glomerata</em> var. <em>tonkinensis</em>, <em>B. lucidula</em>, <em>B. obovalifoliosa</em>, <em>B. palembanica</em>, <em>B. poilanei</em>, <em>B. sphaerocarpa</em> and <em>B. wightii</em>), five names are placed into synonymy for the first time, and <em>B. laotica</em> Kosterm. ex de Kok is validly published here for the first time. In addition, one new variety (<em>B. percoriacea</em> var. <em>percoriacea</em> de Kok) is proposed and one new combination (<em>B. percoriacea</em> var. <em>glaucoides</em> de Kok) is made. Nine species are considered to be Least Concern, one is Critically Endangered, five are Endangered, and five are listed as Vulnerable.</p> Rogier de Kok Copyright (c) 2021 Forest Herbarium 2021-02-01 2021-02-01 49 1 1 26 10.20531/tfb2021.49.1.01 Taxonomic notes on the Rutaceae of Thailand <p>Nomenclatural problems with the name of <em>Atalantia simplicifolia</em> are discussed, and it is shown that the, often used, name of <em>A. roxburghiana </em>is illegitimate. <em>Bergera</em> is established as separate genus for Thailand, formerly part of <em>Murraya</em>. <em>Murraya siamensis</em> is established as a synonym of <em>Bergera koenigii</em>.&nbsp;</p> Hans-Joachim Esser Copyright (c) 2021 Forest Herbarium 2021-02-02 2021-02-02 49 1 27 31 10.20531/tfb2021.49.1.02 Curcuma lithophila and C. rufostriata (Zingiberaceae), two new species from Thailand, and additional notes on C. papilionacea <p><em>Curcuma lithophila</em> and <em>C. rufostriata</em>, two new species from <em>Curcuma</em> subgen. <em>Hitcheniopsis</em>, are described and illustrated. They are compared with their morphologically closest species, <em>Curcuma rhabdota</em>, <em>C. papilionacea</em> and C. sparganiifolia. Notes on distribution, ecology, etymology, uses and IUCN provisional assessments are provided. Further notes on the distribution of the recently described <em>C. papilionacea</em> and an improved IUCN conservation assessment are reported from additional collections.</p> Sutthinut Soonthornkalump Tidarat Pungpairote Sira Niwesrat Jana Skornickova Copyright (c) 2021 Forest Herbarium 2021-02-06 2021-02-06 49 1 32 43 10.20531/tfb.2021.49.1.03 Impatiens tanintharyiensis, a new record of Impatiens sect. Semeiocardium (Balsaminaceae) for Thailand <p><em>Impatiens tanintharyiensis</em> (Balsaminaceae) is reported in Thailand for the first time from a population in Ngao Waterfall National Park, Ranong Province. This population differs from that at the type locality in Myanmar by having smaller, purple flowers (vs bigger purplish-pink flowers). An expanded description of this taxon and colour photographs are provided.</p> Saroj Ruchisansakun Piyakaset Suksathan Pramote Triboun Chalit Sinrothanakorn Copyright (c) 2021 Forest Herbarium 2021-02-08 2021-02-08 49 1 44 48 10.20531/tfb.2021.49.1.04 Thyrsostachys (Poaceae: Bambusoideae) in Thailand: taxonomy, lectotypification and natural distribution <p>A taxonomic account of the genus <em>Thyrsostachys</em> for Thailand, where its two recognized species, <em>T. oliveri</em> and <em>T. siamensis</em>, are among the most economically important and widely planted native bamboos, is provided. A second-step lectotypification of the name <em>Thyrsostachys oliveri</em> is proposed and information on the natural distribution of the genus is also included.</p> Sarawood Sungkaew Somran Suddee Khoon Meng Wong Atchara Teerawatananon Copyright (c) 2021 Forest Herbarium 2021-03-16 2021-03-16 49 1 49 56 10.20531/tfb2021.49.1.05 Thunbergia amphaii (Acanthaceae) a new species from Thailand <p><em>Thunbergia amphaii</em>, a new species from North-Eastern Thailand is described and illustrated. The pseudo-umbel inflorescence is diagnostic for this species. The pollen morphology, especially the size and the pericolpate aperture arrangement, further support this species as new to science.</p> Chalermpol Suwanphakdee Kwanjai Khammonkol David Middleton Somran Suddee Copyright (c) 2021 Forest Herbarium 2021-03-18 2021-03-18 49 1 57 62 10.20531/tfb2021.49.1.06 Heterostemma menghaiense (Apocynaceae), a new record for Laos and Thailand <p><em>Heterostemma menghaiense</em> is reported as a new record for the flora of Laos and Thailand. A description based on Thai and Lao collections, photographs and notes are provided.</p> Woranart Thammarong Sarayut Rakarcha Wittaya Pongamornkul Michele Rodda Copyright (c) 2021 Forest Herbarium 2021-03-24 2021-03-24 49 1 63 65 10.20531/tfb2021.49.1.07 Two new species of Ilex (Aquifoliaceae) from Thailand <p>Two new species of Aquifoliaceae are reported for Thailand. <em>Ilex depressifructu</em> is newly recorded from Umphang District, Tak Province (leaf blades ovate, ovate-oblong or oblong, base obtuse; infructescences solitary dichasia; fruits depressed globose with capitate stigma; pyrenes 5, shallowly-5-sulcate, 6-striate) and <em>Ilex phanganensis</em> (like <em>I. umbellulata</em>, but glabrous, smaller leaves, less veins, diplothyrsoid inflorescences with mainly alternate branches, less pyrenes), is newly recorded from Ko Phagnan Islands, Surat Thani Province. The descriptions and illustrations of the taxa are presented.</p> Kanchana Pruesapan Peter C. van Welzen Copyright (c) 2021 Forest Herbarium 2021-04-21 2021-04-21 49 1 66 72 10.20531/tfb2021.49.1.08