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 Meizotropis (Leguminosae-Papilionoideae), a new genus record for Thailand <p><em>Meizotropis buteiformis</em> (Leguminosae), a new genus and species record for Thailand, is described and illustrated.</p> Sakuntala Ninkaew Charan Maknoi Wattana Tanming Kongkanda Chayamarit Henrik Balslev Pranom Chantaranothai ##submission.copyrightStatement## 2019-01-18 2019-01-18 47 1 1 4 10.20531/tfb.2019.47.1.01 Two new records and lectotypified taxa of the genus Millettia (Fabaceae: Millettieae) for Thailand <p>Two species, <em>Millettia penicillata</em> and <em>M. pierrei</em>, are recorded as new for Thailand. The latter is lectotypified and its characteristics are discussed with the close genera. Illustrations, descriptions, taxonomic notes and distribution map are provided.</p> <p><strong>&nbsp;</strong></p> Sawai Mattapha Auamporn Veesommai Sathaporn Patthum Pranom Chantaranothai ##submission.copyrightStatement## 2019-01-18 2019-01-18 47 1 5 10 10.20531/tfb.2019.47.1.02 Lophopyxidaceae (Malpighiales): a new family record for Thailand <p>The liana <em>Lophopyxis</em> <em>maingayi</em> is recorded from Narathiwat in Peninsular Thailand, representing the first record for this species, the genus <em>Lophopyxis</em>, and the family Lophopyxidaceae in Thailand.</p> Timothy Utteridge ##submission.copyrightStatement## 2019-01-18 2019-01-18 47 1 11 15 10.20531/tfb.2019.47.1.03 Helicteres prostrata (Malvaceae), a new record for Thailand and lectotypifications of H. poilanei and H. vinosa <p>A new record,<em> Helicteres prostrata</em> in Thailand is described and illustrated. Lectotypes of <em>H. poilanei</em> and <em>H. vinosa</em> are also selected.</p> Pranom Chantaranothai Seksun Poompo ##submission.copyrightStatement## 2019-02-13 2019-02-13 47 1 16 18 10.20531/tfb.2019.47.1.04 Natural hybridization – recombination – an ever-ongoing process <p>Exemplified by studies of the SE Asian genus <em>Cryptocoryne</em> (Araceae) we provide evidence that: 1) interspecific hybridization is an everongoing process, and introgression and gene exchange takes place whenever physically possible throughout the region; 2) artificial hybridization experiments confirm that wide crosses are possible in a large number of cases; 3) rivers and streams provide numerous, diverse habitats for <em>Cryptocoryne</em> diaspores to settle in; 4) the changes in habitats caused by recurrent glaciations resulting in numerous splitting and merging of populations facilitates hybridization and segregation of subsequent generations; 5) hybridization is a major driving element in speciation; 6) populations are the units and stepping stones in evolution – not the species.</p> Niels Jacobsen Marian Ørgaard ##submission.copyrightStatement## 2019-02-14 2019-02-14 47 1 19 28 10.20531/tfb.2019.47.1.05