Thai Forest Bulletin (Botany)

Obituary: Prof. Dr Thawatchai Santisuk (1944–2020)

2020-11-18T14:22:24+07:00

Two new species of Pittosporum (Pittosporaceae) for the Flora of Thailand

2020-07-09T20:59:11+07:00

Two new species of Pittosporum (Pittosporaceae) are reported for Thailand. Pittosporum lacrymasepalum from Trat Province and P. maxwellii from Doi Inthanon, Chiang Mai Province are described and illustrated.

Psammosilene tunicoides (Caryophyllaceae) a new generic and species record for Thailand

2020-12-08T13:45:52+07:00

Psammosilene tunicoides, 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.

New records of the genus Psychotria (Rubiaceae) from Thailand

2020-07-15T12:01:33+07:00

Four species of Psychotria are newly recorded from Thailand: P. bonii, P. griffithii, P. langbianensis and P. pachyphylla. Descriptions and list of synonyms are provided and a lectotype for P. bonii is designated.

Begonia colliculata (Begoniaceae), a new species from Nam Kading National Protected Area, Bolikhamxai province, Laos

2020-07-24T08:08:45+07:00

Begonia colliculata is described and illustrated with photographs from Nam Kading National Protected Area, in the Bolikhamxai Province of Laos.

Heterostemma brownii (Apocynaceae), a new record for Laos and Thailand

2020-09-24T21:39:43+07:00

Heterostemma brownii is reported as a new record for the floras of Laos and Thailand. A lectotype is also designated for the name H. brownii. A description based on Thai and Laos collections, photographs and notes are provided.

The Cenozoic leaf morphotypes and palaeoclimate interpretation from the Doi Ton Formation, Mae Sot District, Tak Province, western Thailand

2020-08-04T09:41:40+07:00

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
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.

Notes on the typification of five names in Lauraceae

2020-08-22T10:15:23+07:00

This article deals with inadvertent lectotypifications of five names in the Lauraceae, Cryptocarya densiflora, Cryptocarya impressa, Cylicodaphne infectoria, Laurus cubeba and Litsea castanea, that have been previously overlooked.

A synopsis of Thai Piper (Piperaceae)

2020-08-31T15:38:46+07:00

All native and introduced Thai Piper 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 P. smitinandianum 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.

Dimetra (Oleaceae), a new genus record for Lao PDR

2020-09-11T13:09:13+07:00

A monotypic genus Dimetra represented by D. craibiana Kerr known to be endemic to Thailand. Presently, the specimen from Xayaburi Province, Lao PDR are reported as newly discovered for Laos PDR. Detailed description and photographs are provided.

Cardamine occulta (Brassicaceae), a new name for the Flora of Thailand

2020-09-29T13:55:49+07:00

The common Thai species of Cardamine, treated as C. hirsuta in the Flora of Thailand, is discussed. The correct name should be C. occulta according to recent publications. New data and collections are added.

Geraniaceae in Thailand

2020-10-02T10:11:20+07:00

Members of the geranium family (Geraniaceae) native to Thailand are enumerated. Two genera, Geranium (3 species) and Pelargonium (1 species) are recognized. Pelargonium 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.

Terminalia santisukiana (Combretaceae), a new species from North-Eastern Thailand

2020-11-05T11:00:35+07:00

A new species of Terminalia, T. santisukiana (Combretaceae) from fresh water swamp forest in North-Eastern Thailand is described and illustrated. The new species is similar to Terminalia nigrovenulosa, 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 Terminalia polyantha, having 4–5-winged fruits, but differs by the dense indumentum on the flowers and asymmetrical fruits.

Lectotypification of Porpax scaposa (Orchidaceae)

2020-11-16T07:30:35+07:00

Porpax scaposa is lectotypified. This species is endemic to northern Thailand, and was based on Garrett 717 (BKF, K) when published. We here select the Kew sheet, K000913725, as the lectotype.

Stemona fimbritepala (Stemonaceae), a new species from northern Laos

2020-11-17T13:16:07+07:00

Stemona fimbritepala (Stemonaceae), a new species from northern Laos, is described and illustrated. It is morphologically similar to S. hirtella and S. kerrii 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.

Ten new species of Globba section Globba from continental South-East Asia

2020-12-04T11:56:26+07:00

Ten new species of Globba from Thailand and Vietnam are described and illustrated; Globba amnicola, G. amplectens, G. conferta, G. dasycarpa, G. grandis, G. hilaris, G. impar, G. nitida, G. verecunda and G. williamsiana. Distribution maps and IUCN provisional assessments of each species are provided.

Notes on taxonomy of the genus Argostemma (Rubiaceae) from Vietnam

2020-12-03T15:37:51+07:00

Argostemma pictum (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 Argostemma species in Vietnam.