Thai Forest Bulletin (Botany)

Taxonomic notes on the genus Hymenopyramis (Lamiaceae) in Thailand with one new species, four lectotypifications and two new synonyms

Bhanubong Bongcheewin — 2024-11-01

Hymenopyramis sabuletorum, a new species from the sandstone plateau in Pha Taem National Park, Ubon Ratchathani Province, Thailand is described and illustrated. Four species are lectotypified, i.e. H. acuminata, H. cana, H. siamensis and H. vesiculosa. Hymenopyramis parviflora var. nitida and H. pubescens are placed in synonymy of H. parviflora and H. siamensis, respectively. A key to the seven species recognised in Thailand is provided.

An additional record for Rhamnaceae in Thailand

Shuichiro Tagane — 2024-10-28

Rhamnella tonkinensis (Rhamnaceae) is established as a new record for the Flora of Thailand. A lectotypification of Chaydaia tonkinensis is proposed. An updated key to genera of Rhamnaceae in Thailand is provided.

Four more new species of Microchirita (Gesneriaceae: Didymocarpoideae) from Thailand

David Middleton — 2024-10-08

Four new species of Microchirita (Gesneriaceae) from Thailand are described: Microchirita orothaiae, M. puglisiae, M. radiata and M. simia. With the addition of these species, 41 species are now recorded for Thailand.

Garcinia minutiflora (Clusiaceae), a new record from Peninsular Thailand, with lectotypification

Chatchai Ngernsaengsaruay — 2024-08-08

Garcinia minutiflora (Clusiaceae), previously known only from Peninsular Malaysia, is reported as a new record from dry evergreen forest on limestone hills in Phangnga and Krabi Provinces, Peninsular Thailand. A detailed morphological description, illustrations and a distribution map of the species are presented, along with information on distribution, specimens examined, habitat, conservation assessment, phenology and vernacular name. In addition, G. minutiflora is lectotypified.

Balanophora papuana (Balanophoraceae), a newly recorded species for Thailand

Natthapruek Sakdapipanich — 2024-07-23

This paper presents a new record to the flora of Thailand: Balanophora papuana. The species is characterised by its unique morphology, notably a tuber that branches into numerous small ovoid to sub-globose tubers, each with a verrucose surface. Additionally, the species exhibits a distinct opposite decussate phyllotaxy with 4–5 leaves. A morphological description, distribution, ecology, vernacular name, and illustration of the species are provided, based on female herbarium specimens collected from Narathiwat and Yala Provinces, Southern Thailand.

Dalbergia calcarea, a new species of Dalbergia (Fabaceae: Dalbergieae) from Lao PDR

Soulivanh Lanorsavanh — 2024-07-15

Dalbergia calcarea, a new species currently only known from the limestone mountains of Khammouan Province, central Laos, is described and illustrated. The key characters such as habit, colour and limb of standard, and number of ovules of the new species are discussed and compared with its closest relatives. A detailed description along with etymology, conservation status, illustrations and colour photographs are provided for a new species. This discovery increases the number of Laotian species in the genus Dalbergia to seventeen taxa.

Two new records of fairy lanterns, Thismia (Thismiaceae) for the Flora of Laos

Phongphayboun Phonepaseuth — 2024-07-15

Two species of the genus Thismia (Thismiaceae), T. angustimitra and T. javanica, from Nam Kading National Protected Area, central Laos, are recorded for Lao flora for the first time. The number of species of Thismia in Laos is raised to three, and a key to species of Thismia in Laos is provided.