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 Notes on the genus Argostemma (Rubiaceae) from Lao PDR <p>Three species of <em>Argostemma</em> (Rubiaceae) are newly recorded for Lao PDR: <em>A. ebracteolatum</em>, <em>A. pictum</em> and <em>A. verticillatum</em>. Descriptions and photographs of the new records are provided, and a key to Argostemma in Lao PDR is presented.</p> Soulivanh Lanorsavanh Pranom Chantaranothai ##submission.copyrightStatement## 2019-03-18 2019-03-18 47 1 29 33 10.20531/tfb.2019.47.1.06 A new record of Ehretia (Ehretiaceae, Boraginales) for Thailand <p><em>Ehretia silvana</em>, a tree from limestone habitat in Uthai Thani province, is newly recorded for Thailand. A description and illustrations are provided, together with a conservation assessment and a new key to the species of <em>Ehretia</em> in Thailand.</p> Kanokorn Rueangsawang Manop Poopath Pranom Chantaranothai ##submission.copyrightStatement## 2019-03-25 2019-03-25 47 1 34 37 10.20531/tfb.2019.47.1.07 Five new species of Henckelia (Gesneriaceae) from Myanmar and Thailand <p>Five new species of Henckelia are described, two from Myanmar: <em>Henckelia campanuliflora</em> and <em>H. candida</em>, and the others from Thailand: <em>H. amplexifolia</em>, <em>H. nakianensis</em> and <em>H. dasycalyx</em>. A key to the 1 to 2-leaved species of the genus is given, as well as photographs, ecology, and also IUCN conservation status for the new species.</p> Sukontip Sirimongkol John Parnell Trevor Hodkinson David Middleton Carmen Puglisi ##submission.copyrightStatement## 2019-04-04 2019-04-04 47 1 38 54 10.20531/tfb.2019.47.1.08 Pollen morphology of Lecythidaceae in Southeast Asia <p>The pollen morphology of four genera and 33 taxa of Lecythidaceae in Southeast Asia was investigated, including 26 taxa of <em>Barringtonia</em>, one taxon each of <em>Careya</em> and <em>Chydenanthus</em>, and five taxa of <em>Planchonia</em> to determine which, if any, taxonomically important characters were present and the implications they have for the systematics of the family. Acetolysed and unacetolysed pollen samples were investigated using light and scanning electron microscopy (SEM). The pollen grains were found to be monads, radially symmetrical, isopolar, small to medium-sized, syntricolpate or syntricolporate, prolate spheroidal, oblate spheroidal, subprolate, suboblate or spherical in shape with marginal ridges. Marginal grooves and polar cushions are commonly present in most species. The polar ectoaperture may be open or sealed. The mesocolpial sculpturing is perforate-reticulate. The colpial surface is smooth, with sparsely or densely scattered verrucae-gemmae and with clavate to pilate elements scattered or aligned in longitudinal rows. The results indicated that pollen morphological characters can be used for identification and classification of some closely related species in the genus <em>Barringtonia</em>.</p> Woranart Thammarong Pranom Chantaranothai John A.N. Parnell Trevor R. Hodkinson Pimwadee Pornpongrungrueng ##submission.copyrightStatement## 2019-04-17 2019-04-17 47 1 55 68 10.20531/tfb.2019.47.1.09 Drimia indica (Asparageceae, Scilloideae), a new record for Thailand <p><em>Drimia indica</em> is newly recorded for Thailand. A description and illustrations are provided.</p> Sunanta Wisittipanich Santi Saraphol ##submission.copyrightStatement## 2019-05-31 2019-05-31 47 1 69 72 10.20531/tfb.2019.47.1.10 Previously unrecorded facets of the life of the ‘Father of Thai Botany’ A.F.G. Kerr including further information on his distribution of plant material. <p>Further information on the life of A.F.G. Kerr, concerning his craniological collection, historical interests, modes of travel in Thailand, mapping of expeditions and distribution of living plants, herbarium material and seeds are briefly documented.</p> John A.N. Parnell ##submission.copyrightStatement## 2019-06-04 2019-06-04 47 1 73 81 10.20531/tfb.2019.47.1.11 Flora of Nam Kading National Protected Area V: Two new species of Camellia (Theaceae), C. namkadingensis and C. rosacea <p>Two new species of <em>Camellia</em> (Theaceae), <em>C. namkadingensis</em> and <em>C. rosacea</em>, from Nam Kading National Protected Area, Central Laos, are described. Illustrations, DNA barcodes for <em>rbcL</em> and <em>matK</em> and IUCN conservation status assessments also provided.</p> Phetlasy Souladeth Shuchito Tagane Tetsukazu Yahara ##submission.copyrightStatement## 2019-06-06 2019-06-06 47 1 82 90 10.20531/tfb.2019.47.1.12 A revision of Meiogyne (Annonaceae) in Thailand, with descriptions of four new species <p>We review the species diversity of the Asian genus <em>Meiogyne</em> (Annonaceae) in Thailand. Four new species, <em>M. anomalocarpa</em>, <em>M. chiangraiensis</em>, <em>M. gardneri</em>, and <em>M. maxiflora</em>, are described. <em>Meiogyne anomalocarpa</em> has the widest distribution of any <em>Meiogyne</em> species in Thailand, but the other three species are narrowly distributed. <em>Meiogyne anomalocarpa</em> and <em>M. maxiflora</em> have the axillary inflorescences typical of the genus, but in <em>M. chiangraiensis</em> and <em>M. gardneri</em> the inflorescences are flagelliform and arise from the lower trunk, a morphology previously unreported from members of this genus. The presence of <em>M. chiangraiensis</em> in northern Thailand extends the range of the genus significantly northward. <em>Meiogyne caudata</em> is reported as new to the flora of Thailand. Several <em>Meiogyne</em> specimens from southernmost Thailand previously identified as <em>M. virgata</em> in the past by various workers were found to be more similar to <em>M. kanthanensis</em>, recently described from Perak, Peninsular Malaysia. A key is provided for the eight species currently recognized as occurring in the country.</p> David M. Johnson Ming-Fai Liu Richard M. K. Saunders Piya Chalermglin Tanawat Chaowasku ##submission.copyrightStatement## 2019-06-12 2019-06-12 47 1 91 107 10.20531/tfb.2019.47.1.13 The genus Calycularia (Calyculariaceae, Marchantiophyta) in Thailand <p>A taxonomic study of the genus <em>Calycularia</em> in Thailand is presented, based on herbarium specimens and field surveys. Only one species is recognized in the country, namely <em>Calycularia crispula</em>. A detailed description, line drawings and photographs are provided. In addition, <em>Apopellia endiviifolia</em> (Pelliaceae) is excluded from the Thai bryoflora.</p> Narin Printarakul Phiangphak Sukkharak Sahut Chantanaorrapint ##submission.copyrightStatement## 2019-06-12 2019-06-12 47 1 108 112 10.20531/tfb.2019.47.1.14 The genus Dumasia (Fabaceae) in Thailand <p>In Thailand two species of <em>Dumasia</em> occur, <em>D. villosa</em> subsp. <em>villosa</em> and <em>D. yunnanensis</em>. They grow in montane and dry evergreen forests, in open or disturbed areas and limestone ridges 550–2,500 meters above sea level, in northern, northeastern, and central Thailand. We present a key to the two Thai <em>Dumasia</em> based on their vegetative, flowering and fruiting characters, and provide nomenclature, descriptions, photographs, illustrations, and information about their distribution and ecology.</p> Rumrada Meeboonya Chatchai Ngernsaengsaruay Henrik Balslev Kongkanda Chayamarit ##submission.copyrightStatement## 2019-06-14 2019-06-14 47 1 113 120 10.20531/tfb.2019.47.1.15