Piyakaset Suksathan

Piyakaset Suksathan
Queen Sirikit Botanic Garden

Ph.D.

About

59
Publications
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248
Citations
Introduction

Publications

Publications (59)
Article
Premise: Hedychium J.Koenig (Zingiberaceae) is endemic to the Indo-Malayan Realm and is known for its colorful and fragrant flowers. Historically, two different pollination syndromes characterize Hedychium: diurnal or bird pollination and nocturnal or moth pollination. In this study we aim to understand the evolution of nocturnal and diurnal flowe...
Article
The Indo-Malayan Realm is a biogeographic realm that extends from the Indian Subcontinent to the islands of Southeast Asia (Malay Archipelago). Despite being megadiverse, evolutionary hypotheses explaining taxonomic diversity in this region have been rare. Here, we investigate the role of geoclimatic events such as Himalayan orogeny and monsoon int...
Preprint
PREMISE Hedychium J.Koenig (ginger lilies: Zingiberaceae) is endemic to the Indo-Malayan Realm (IMR) and is known for its fragrant flowers. Two different pollination syndromes characterize the genus: diurnal or bird pollination and nocturnal or moth pollination systems. To date, no attempt has been undertaken to understand the evolution of floral t...
Article
Full-text available
One new species, Impatiens rostrata Souvann. & Lanors., is described and illustrated, and nine new records of Impatiens for Laos are reported. A lectotype of Impatiens rubrostriata Hook.f. is designated, and two new synonyms are made.
Article
Impatiens tanintharyiensis (Balsaminaceae) is reported in Thailand for the first time from a population in Ngao Waterfall National Park, Ranong Province. This population differs from that at the type locality in Myanmar by having smaller, purple flowers (vs bigger purplish-pink flowers). An expanded description of this taxon and colour photographs...
Article
Impatiens tanintharyiensis (Balsaminaceae) is reported in Thailand for the first time from a population in Ngao Waterfall National Park, Ranong Province. This population differs from that at the type locality in Myanmar by having smaller, purple flowers (vs bigger purplish-pink flowers). An expanded description of this taxon and colour photographs...
Article
Full-text available
One new species, Impatiens rostrata Souvann. & Lanors., is described and illustrated, and nine new records of Impatiens for Laos are reported. A lectotype of Impatiens rubrostriata Hook.f. is designated, and two new synonyms are made.
Article
Full-text available
Curcuma cinnabarina and C. eburnea ( Curcuma subg. Ecomatae , Zingiberaceae), two new species from Thailand, are described and illustrated here. They are compared with the morphologically closest species Curcuma rubrobracteata and C. pierreana , respectively. Detailed descriptions, colour plates, and information on their distribution, ecology, phen...
Article
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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.
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Article
Impatiens jenjittikuliae Ruchis. & Suksathan, a new species from a limestone area in Thasongyang District, Tak Province, Northern Thailand, is described and illustrated. This endemic new species is distinguished from the most similar, I. lacei Hook.f. through having pilose lateral sepals vs glabrous, and by the absence of long hairs along the lamin...
Article
A revision of the Balsaminaceae of Myanmar is presented based on herbarium collections and a field trip in 2015. Sixty-five species, unevenly distributed across one monotypic (Hydrocera) and one species-rich genus (Impatiens), are recognised. An identification key to species is presented. Twenty species are new records for the country, 17 names are...
Article
Full-text available
Three new species of Impatiens (Balsaminaceae) from Myanmar are here described: I. decurva Ruchis. & S.B. Janssens, I. hartnolliae Hook. f. ex Ruchis. & Suksathan, and I. oblongata Ruchis. &Van der Niet. The 5-lobed short fusiform fruit of all three species suggests that they are members of subgen. Impatiens sect. Uniflorae Hook. f. & Thomson. For...
Article
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In 2010, the second author found a possible new species of Bulbophyllum in Mae Hong Son Province, northern Thailand. Three years later, Pitak Panyachan (Queen Sirikit Botanic Garden) found the same species on a fallen tree some six km from the first locality. Living plants were collected and brought back to QSBG in Chiang Mai for further investigat...
Article
Full-text available
Impatiens tanintharyiensis Ruchisansakun, Suksathan & Saw-Lwin from the Tanintharyi region of Southern Myanmar is described and illustrated as a new species. The presence of connate lateral united petals and a four-locular ovary, as well as results of molecular phylogenetic analyses of nuclear ITS and plastid atpB-rbcL spacer DNA sequences, suggest...
Article
Thunbergia lutea T.Anderson, a new record for Thailand is reported. A description, illustrations, and distributional data are provided.
Article
A new species, Syzygium sirindhorniae, from Thailand, is described, illustrated and compared with Syzygium bokoense. This species is known from a restricted locality in northern Thailand which is within a protected area. A conservation status of Near Threatened (NT) is merited.
Article
Full-text available
Impatiens kamtilongensis Toppin (Balsaminaceae), collected from Xuan Lien district, Thanh Hoa province is reported here as a new record for the flora of Vietnam. I. kamtilongensis can be distinguished from its closest ally I. finetii by its hairy white stem, yellow flowers having 2 red blotches, bigger sepals and glabrous capsule. The specimens are...
Data
Full-text available
A new species of Swertia (Gentianaceae) from Thailand is described and illustrated.
Data
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Impatiens gadellae Souvann. & Suksathan, Impatiens nurae Souvann. & Suksathan, two new species from North Lao PDR, are described and illustrated with conservation statuses propose.
Article
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Phylogenetic analyses have revealed extensive evolutionary lability of morphological characters in the large genus Impatiens. This potentially complicates taxonomic classifications, especially if these are based on analyses which include a limited number of characters and taxa. In this study we focus on the systematics of previously poorly represen...
Article
Full-text available
Abstract— A new species of banana (Musaceae), Musa nanensis Swangpol & Traiperm, from Nan, Thailand, is described and illustrated. Based on vegetative features, M. nanensis could be superficially categorized as related to M. laterita; however, it possesses several unique floral characters from the rest of the genus Musa, especially its six tepals a...
Article
An interspecific hybridization had been carried out among four species of Globba, G. schomburgkii, G. magnified, G. rosea and G. globulifera. Direct and reciprocal crosses were made. Two crosses, G. rosea x G. globulifera and G. rosea x G. magnifica, produced fruits in both direct and reciprocal crosses, whereas the other crosses produced fruits on...
Article
A study on the somatic chromosome number (2n) of 17 Thai native Impatiens species was conducted. It was found that the 2n numbers of Impatiens species are: I chinensis = 16, I. daraneenae = 34, I. duclouxii = 16, I. garrettii = 14, I. longiloba 18, I. mengtzeana = 16, I. mirabilis = 30, I. nalampoonii = 32, I. namkatensis = 20, I. parishii = 34, I....
Article
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A morphologically distinct element of the group of Dracaena species from Thailand and Burma with undifferentiated leaf sheaths, no leaf blade central costa, free tepals and free thickened filaments known as Chan nuu or Chan pha krai in Thai is shown to be a distinct species, Dracaena kaweesakii Wilkin & Suksathan based on habit, leaf base and margi...
Article
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The two species of Veratrum in Thailand, V. mengtzeanum and V. chiengdaoense, are supported as conspecific with a detailed morphological study. Two distinct subspecies of V. mengzeanum s.l. are defined based on morphology and distribution, and a new subspecies, Veratrum mengzeanum subsp. phuwae is described. Conservation assessments are provided fo...
Article
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The taxonomic baseline for Dracaena in Thailand is reviewed, concentrating on a group of species for which morphology suggests a relationship with D. draco L., D. tamaranae Marrero Rodr., R. S. Almeida & Gonz.-Mart., D. ombet Heuglin ex Kotschy & Peyr., D. schizantha Baker, D. serrulata Baker, D. cinnabari Balf. f. and D. ellenbeckiana Engl. One mo...
Article
Full-text available
The genus Rhachidosorus is newly recorded for Thailand and the species Rhachidosorus siamensis S.Linds. is described.
Presentation
The Convolvulaceae account for Flora of Thailand was published in 2010. Of the 119 species treated there, at least 26 were known from ≤ 5 herbarium vouchers, and 7 of those are known only from the type collection. Thus ca 22% of the species in the flora are considered inadequately known. Yet, despite the seeming rarity of so many Thai Convolvulacea...
Article
Full-text available
The Marantaceae are represented in the Philippines by 2 genera, Donax and Phrynium with 8 native species of which 3 are endemic and three near-endemic. All species are poorly documented in the literature and the most contemporary taxonomic treatments are more than 80 years old. We provide an up to date taxonomic treatment of the Philippine Marantac...
Article
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The new species Adiantum membranifolium S.Linds. & Suksathan from northern Thailand is described and illustrated.
Article
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Polystichum hookerianum (C.Presl) C.Chr., a new record for Thailand, is described and illustrated.
Article
Schumannianthus monophyllus Suksathan, Borchsenius & A. D. Poulsen, a new species of Marantaceae is described and illustrated. It differs from its closest relative S. dichotomus (Roxburgh) Gagnepain in having acaulescent vegetative shoots and shortly caulescent, unbranched fertile shoots (vs. with richly branched aerial stems), each shoot with only...
Article
Eight genera and approximately 55 species of Marantaceae occur in Asia. Until recently these were the most poorly understood members of the family, but over the last few years much progress have been made in understanding their alpha taxonomy and distribution. Generic delimitation and phylogenetic relationships between genera, however, remain uncle...
Article
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Review of a herbarium specimen (QBG) and subsequent field studies have revealed that Diphasiastrum multispicatum occurs near the summit of the two highest mountains in Thailand. This species is restricted to SE Asia and grows exclusively at higher elevations in the submontane to montane zone. Previously, it has been reported from China, the Philipp...
Article
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A third species of Tirpizia, T. bilocularis Suksathan & K.Larsen from N Thailand is described and illustrated with a short note on the genus. T. bilocularis is characterized by pink, fused corolla lobes forming a tube of 2.8–3.3 cm long, two styles, and a bilocular ovary. A key to all species in the genus and a distribution map are provided.
Article
Five genera of Marantaceae with a total of 14 species occur in Thailand. Full nomenclatural citations are provided with notes on typification, synonyms and distribution of all taxa. One generic and eleven species names are lectotypified; one species name is neotypified; twenty-two new synonymisations are reported; the new combination Stachyphrynium...
Article
A new species, Adiantum thongthamii (Pteridaceae), known only from a small island in southeastern Thailand is described and illustrated.
Article
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Stachyphrynium longispicatum from S Thailand and adjacent parts of peninsular Malaysia and S. lancifolium from NW Borneo (Brunei and Sarawak) are described as new species and illustrated.
Article
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The new species Caulokaempferia larsenii (Zingiberaceae) from northern Thailand is described and illustrated.
Article
Two new species of Caulokempferia from Thailand, C. amplexicaule and C. pedemontana are described and illustrated. The biogeography and the diversity of the genus are discussed.
Article
The new orchid genus Sirindhomia, named after H. R. H. Princess Maha Chakri Sirindhorn of Thailand, is established to accommodate three species from Thailand (Chiang Mai and Tak provinces), Myanmar (Shan State), and China (Yunnan province). Two new species are described and a new combination, based on Habenaria monophylla Collett & Hemsl., is made;...
Article
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A new species of Swertia (Gentianaceae) from Thailand is described and illustrated.
Article
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Previous herbaria and literature studies have led to the recognition of three species of Parnassia L. in Thailand, P. mysorensis Heyne ex Wight & Arn., P. siamensis Shimizu and P. wightiana Wall. ex Wight & Arn. Recent fieldwork in northern Thailand has revealed large variation in characters traditionally ascribed diagnostic value, which suggests t...

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Projects

Projects (3)
Project
A revision of the 28 genera and nearly 400 species of Zingiberaceae occurring in Thailand for the Flora of Thailand series. Fifteen authors will contribute revisions of the genera, to be compiled and edited by authors at Bangkok Forest Herbarium and the Royal Botanic Garden Edinburgh.
Archived project
genome size evolution, genetic diversity, phylogenetics, phylogenomics, taxonomy
Project
Investigations on all aspects of tropical Asian morning glories and relatives: biology, taxonomy, natural history, ecology, and systematics. We use diverse methodologies and techniques including Anatomy, Morphology, Field Study, Molecular Systematics, Palynology, Phenetics, and Plant-Animal Interactions, among others.