Thai Forest Bulletin (Botany)

Contributions to the Flora of Myanmar V: a new record of Mallotus tokiae (Euphorbiaceae) with the description of flower morphology from Lampi Island

2020-01-10T13:53:15+07:00

Mallotus tokiae (Euphorbiaceae), a poorly known species, was described based upon a single fruiting specimen from Surat Thani Province, peninsular Thailand. We found this species with staminate and slightly mature pistillate flowers in Lampi Island, Myanmar. A new locality record, description of flowers, preliminary conservation assessment and DNA barcoding of this species are provided.

Cytogenetic verification of Curcuma candida (Zingiberaceae) from Thailand and Myanmar

2020-01-29T15:44:17+07:00

Curcuma candida is a conservation-vulnerable species, rare and endemic to the Tenasserim Range (Thio Khao Tanaosri). This species was initially classified into the genus Kaempferia, based on morphology of specimen from Myanmar, and was given the name K. candida in 1830, but the first specimen from Thailand was only discovered in 2000. With the addition of molecular evidence, the species was transferred to Curcuma. The aim of the present study was therefore to find cytogenetic identity of C. candida, by investigating mitotic and meiotic divisions of five accessions obtained from the border districts of Thailand and Myanmar, in comparison with previous cytogenetic records of Curcuma and Kaempferia. The results show that C. candida is diploid with 2n = 42 and there is no variation among accessions. All accessions showed meiotic figure representing 21 bivalents during microsporogenesis, indicating the secondary base number x = 21. These chromosomal characteristics are closely similar to those found in diploid Curcuma species. The present paper also includes field observation and description of the plant phenology. The work has underlined an urgent need to protect this species in nature. During the sample collection trips we witnessed an excessive collection of edible flowers for local consumption.

Two new genera of Apocynaceae for Laos

2020-02-05T07:33:34+07:00

Examination of unidentified Apocynaceae specimens at QBG and SING lead to the discovery of one specimen of Meladerma deciduum and two specimens of Harmandiella cordifolia from Laos. Harmandiella was earlier considered endemic to Thailand and Vietnam while Meladerma was earlier reported from Thailand and Peninsular Malaysia. Harmandiella cordifolia and Meladerma deciduum are typified.

Leontopodium andersonii (Asteraceae), a new genus record to Thailand

2020-02-21T10:49:18+07:00

Leontopodium andersonii is here for the first time recorded for Thailand, and is also the first record of the genus Leontopodium (Asteraceae) in Thailand. A description and an illustration are provided.

Taxonomic notes on the genus Alphonsea (Annonaceae) in Thailand

2020-02-25T14:49:47+07:00

The following four species in the genus Alphonsea (Annonaceae) are new records for Thailand: Alphonsea glandulosa, A. kingii, A. lucida and A. malayana. Alphonsea lutea var. longipes is reduced to a taxonomic synonym of A. glandulosa. The reinstatement of A. pallida is proposed and explained. Complete descriptions are provided here for both A. pallida and A. siamensis following the recent discovery of the fruits of the former and the flowers of the latter. Descriptions of all taxa with notes on their distribution, ecology, vernacular names and photographs are also provided.

Diospyros phuwuaensis (Ebenaceae), a new species from North-Eastern Thailand

2020-03-10T15:03:55+07:00

Diospyros phuwuaensis, a new species from Phu Wua Wildlife Sanctuary, North-Eastern Thailand is described and illustrated. Photographs, ecological information and an IUCN conservation status are provided. The distinctive morphological characters of the new species and its related species are discussed. Based on cpDNA data, the new species is confirmed as an independent lineage and placed in the Diospyros clade V sensu Duangjai et al. (2009). It has phylogenetic affinities with Diospyros mollis, and then D. fulvopilosa and D. kurzii. Our result supports the assignment of the new species to Diospyros section Kurzella. A revised description and a key to the species of Diospyros section Kurzella is presented.

Staurogyne beddomei (Acanthaceae), a new record for Thailand

2020-03-11T09:10:20+07:00

Staurogyne beddomei, a species known previously only from Myanmar, is newly recorded for Thailand. A description, photographs and conservation status are provided - the species is considered to be of Least Concern.

Impatiens capillipes (Balsaminaceae), a new record for Thailand

2020-03-11T11:51:11+07:00

Impatiens capillipes was found for the first time in Thailand. The population in Thailand has slightly larger leaves and flowers than the population in Myanmar. An expanded description of this species and colour photographs are provided.

Notes on Uraria (Leguminosae: Papilionoideae: Desmodieae) from Thailand and Vietnam

2020-03-12T13:11:14+07:00

Uraria balansae and U. barbaticaulis are newly recorded from Thailand. Uraria pseudoacuminata is reported as new for Vietnam. Descriptions, ecological data, vernacular names, photographs and distribution maps are provided. Uraria balansae is lectotypified.