Vuong Ba Truong

Institute of Tropical Biology · Department of Biological Resources

The paper presents new data on the orchid diversity of Vietnam obtained mainly during the fieldwork of 2023–2024, as well as a result of investigation of the herbarium and garden collections of Russia and Vietnam. It includes five species new to science, namely Cleisostoma truongquanii, Cymbidium bavuongii, Hemipilia uniflora, Micropera vietnamensi...

The paper presents an illustrated taxonomic survey of Bulbophyllum sect. Macrocaulia in the flora of Vietnam including a key to species identification, data on phenology, habitat, distribution and taxonomic notes for all accepted species. The estimated conservation status of these species in Vietnam is also discussed. Additionally, Bulbophyllum pap...

Psychotria condorensis Pierre ex Pitard is an endemic species described from Con Dao National Park, Ba Ria-Vung Tau province, Vietnam. This study provides the lectotype of this species and describes its micromorphological along with phytochemical characteristics. These results are used as a monograph in the identification and standardization of med...

The paper presents new data on the orchid diversity of Vietnam obtained mainly during the fieldwork of 2020–2023, as well as a result of investigation of the herbarium collections of Russia and Vietnam. It includes two species new to science, Bidoupia micrantha and Hylophila vietnamensis, and three species new to the native flora of Vietnam, i.e. D...

Chiloschista eckhardii, discovered recently in Ha Giang Province of northern Vietnam, is described as a new species to science. The newly discovered species belongs to group of plants having yellow sepals and petals spotted with dark brown marks. Our newly identified species may be misidentified as C. glabrisepala, C. parishii, or C. quangdangii, w...

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.

The paper presents new data on the orchid diversity of Vietnam obtained mainly in the course of the fieldwork in 2020–2023, as well as from the investigation of the collections stored at the Herbaria of Russia and Vietnam. It includes descriptions of four species (Appendicula spicata, Dendrobium khanhii, D. vietii, Listera anthropophora) and one va...

TÓM TẮT Ở Việt Nam, chi Lấu (Psychotria L.) có khoảng 27 loài và 1 thứ, trong đó 9 loài có giá trị dược liệu trong y học cổ truyền. Bài báo này nghiên cứu đặc điểm thực vật học và khảo sát thành phần hóa học của loài Lấu (Psychotria sarmentosa var. membranacea (Pit.) P.H.Hô) bằng phương pháp so sánh đặc điểm hình thái, cấu tạo giải phẫu và định tín...

A new species of Nymphanthus (Phyllanthaceae), N. namkadingensis from Bolikhamxai Province, central Laos, is described and illustrated, along with its vernacular name and preliminary conservation status. The new species is similar to N. rubescens, but distinguished by having larger stipules, longer pedicels, and connate annular disc glands (vs. fre...

Một nghiên cứu về đặc điểm hình thái, giải phẫu và phân bố loài Lấu tuyến (Psychotria adenophylla Wall) được tiến hành ở các đảo vùng Nam Bộ, Việt Nam. Kết quả thu được: Về mặt hình thái, Lấu tuyến có thân nhẵn, lá đơn, nguyên, nhẵn, mọc đối chữ thập, mặt dưới lá có tuyến domatia ở góc gân chính và gân phụ, cụm hoa dạng chùm kép, mọc ở đầu cành, ho...

Nghiên cứu được thực hiện nhằm cung cấp dữ liệu về thành phần loài thực vật bậc cao (TVBC) ở đảo Lại Sơn, làm cơ sở khoa học cho việc sử dụng, quản lý và bảo tồn nguồn tài nguyên thực vật tại đây. Các phương pháp được sử dụng bao gồm PRA; điều tra thực địa; so sánh hình thái để phân loại và tra cứu các tài liệu chuyên ngành về thực vật. Kết quả đã...

Nghiên cứu được thực hiện nhằm đánh giá thực trạng đa dạng nguồn tài nguyên cây có ích ở đảo Nam Du, làm cơ sở khoa học cho việc khai thác, sử dụng, quản lý và bảo tồn nguồn tài nguyên thực vật ở đảo. Các phương pháp được sử dụng gồm PRA; điều tra thực địa; so sánh hình thái để phân loại và tra cứu các tài liệu chuyên ngành về cây có ích. Kết quả đ...

A new species, Hoya sungwookii, discovered in southern Vietnam near Nha Trang Town (Khanh Hoa Province) is described and illustrated. It belongs to the type section of the genus and is distinguished from the morphologically closest H. ablongacutifolia (= H. graveolens) in glabrous pedicels, smaller flower 1.1–1.4 cm across, greenish ciliate calyx,...

A new species of Bulbophyllum section Brachyantha was found in Phu Yen province, center of Vietnam, and described as new for science. It most closely resembles Bulb. baosangii, Bulb. trongquyetii and Bulb. nipondhii but differs in many morphological aspects.

39 Novelties in Aspidistra (Asparagaceae, Convallarioideae) with erect stems in the flora of Vietnam: A. quanii, a new species, and A. erecta, a new national record Abstract The paper reports two species of Aspidistra newly discovered in the flora of Vietnam. It includes a description of A. quanii, a species new to science found in the central part...

Two new species of Cymbidium sect. Jensoa (Orchidaceae) are described from southern Vietnam as new for science under the names C. ledinhhienii and C. sungwookii. Both species morphologically are most similar to C. nanulum but clearly differ by the epigeous pseudobulbs and articulate perennial leaves when plant flowers with leaves. Diagnostic charac...

We report six native taxa of flowering plants from Nam Kading National Protected Area, which are poorly known or have not been previously documented in Laos: Thunbergia amphaii (Acanthaceae), Aetheolirion stenolobium (Commelinaceae), Elaeocarpus balansae (Elaeocarpaceae), Lepionurus sylvestris (Opiliaceae), Adina pilulifera (Rubiaceae), and Causoni...

Three species of the genus Hoya (Apocynaceae, Asclepiadoideae) are newly reported for the flora of Vietnam. One species, Hoya honglenae, is described and illustrated as new to science, and two species, H. acuminata and H. phuwuaensis, are reported as new national records known earlier, respectively, in Bhutan, Bangladesh, NE India, W China, Myanmar...

A study of the diversity of rare medicinal plants from the Southern islands of Vietnam was carried out. The study results identified 94 species of rare medicinal plants belonging to 61 genera, and 35 families of three phyla of vascular plants (Polypodiophyta, Pinophyta, and Magnoliophyta). There are 21 species at ndangered and 39 species at Vulnera...

The taxonomical survey of Bulbophyllum sect. Cirhopetallum s. str. with the key for identification of all four species occurring in Vietnam is presented. Bulbophylum thangii, belonging to this section and discovered in Khanh Hoa Province, southern Vietnam, is described as a new species for science. The new species shares prominent tooth on the inne...

The new species of the genus Lysionotus (Gesneriaceae), named L. namchoomii, discovered in Pakke-Kessang District of Arunachal Pradesh, India, is described and illustrated here. It differs from morphologically similar L. ziroensis mainly in glabrous vegetative organs, denticulate-crenulate leaf blade, deltoid inflorescence bracts, free spatulate gl...

The seventh paper of the series on orchid diversity in Vietnam includes descriptions of four species new to science (Goodyera umbonata, Myrmechis brachyscapa, Rhomboda obcordata, and Vietorchis proboscidea) and five new national records (Calanthe speciosa, Habenaria coultousii, Myrmechis urceolata, Paphiopedilum barbigerum var. barbigerum, and Peri...

A new species, Psychotria ngotphamii (sect. Psychotrieae), is described and illustrated from Bidoup - Nui Ba National Park, Lam Dong Province, Vietnam. Psychotria ngotphamii is most similar to P. bonii Pit. but distinguished by its smaller leaf blades, shorter petioles, longer calyx and corolla lobes, and larger fruits. Photographs, vernacular name...

An unusual species of Phaius discovered in the Da Nang City Area in southern Vietnam is described here as new to science. It is similar to P. hekouensis but can be recognized by the smaller habit, flower color, lip ornamentation, spur, and column characters. The standard taxonomic description, as well as data on its distribution, ecology, phenology...

A newly discovered species belonging to the genus Chiloschista has been found in the Northern region of Vietnam, specifically in Ha Giang Province. This species is being described as a novel addition to scientific knowledge. It shares similarities in plant habit and flower color scheme with C. parishii and C. glabrisepala. However, it can be distin...

A new species of Camellia sect. Piquetia (Theaceae), C. hiepii sp. nov. from the Chu Mu Mountains, M'Drak District, Daklak Province, Vietnam, is described and illustrated. The new species is most similar to C. longii Orel & Luu, but differs in having young branches sparsely pubescent, larger leaf blades, more secondary veins, flowers 8-9 cm in diam...

Homalomena perplexa K.Z.Hein, Vuong, Bao & V.S.Dang from Ba Ria Vung Tau province, Vietnam, is described and illustrated as a species new to science. Description, color plates, discussion of similar taxa, phenology, distribution, and a preliminary conservation status assessment are provided. Homalomena philippinensis Engl. is lectotypified.

The paper provides a short annotated taxonomic review of Bulbopyllum sect. Tripudianthes from the flora of Vietnam along with a species-level key for identification. The section in Vietnam includes five species, one of which is a new species for science and described under the name, B. viridipallidum. The new species was found recently from Kon Tum...

This paper presents new data on the orchid diversity of Vietnam obtained from field explorations made mainly in 2015–2022, as well as from the study of some historical collections housed at the Herbaria of Russia and Vietnam. It includes descriptions of two species new to science (Coelogyne phitamii and Cymbidium sangii), reports of one genus (Stig...

A new species, Garcinia phuongmaiensis V.S.Dang, H.Toyama & D.L.A.Tuan (Clusiaceae), discovered from Phuong Mai Peninsula, Nhon Hoi Commune, Quy Nhon City, Binh Dinh Province, central Vietnam, is described and illustrated. This new species is similar to G. prainiana King, but is distinguished by smaller habit, leaves and flowers with white petals....

Coelogyne lecongkietii (C. sect. Panisea) was found in Lac Duong District, Lam Dong Province, southern Vietnam (Da Lat Paleau, Central Highlands), and is described here as a new species for science. It resembles C. sagittata in having the backward pointed side-lobes of the lip, but strongly differs in the smaller flower, shorter side-lobes, and dis...

A new species of Bulbophyllum (Orchidaceae), named as B. sondangii discovered in Da Lat Plateau (Da Lat Town area, Lam Dong Province of southern Vietnam) is described and illustrated. The new species is similar to B. andersonii and B. trongsaense, but can be distinguished by a short seta at the apex of median sepal and petals; almost entire margin...

Raphiocarpus taygiangensis , a new species of Gesneriaceae family discovered in Tay Giang District, Quang Nam Province, Central Vietnam, is here described and illustrated. The new species is diagnosed by the combination of its stem up to 2 m long, sericeous hairs on young stem, leaf petiole and adaxial mid-vein, sparsely and minutely serrate leaf m...

Two new species of genus Helicteres (Malvaceae, Helicteroideae), Helicteres Taynguyenenis and Helicteres dakmilensis from the Central Highlands of Vietnam are described and illustrated. H. taynguyenensis is morphologically similar to Helicteres angustifolia widely distributed in mainland SE Asia to China, Japan and Australia, but differs from the l...

Lasianthus gialaiensis V.S.Dang, Vuong, Quan & Naiki, a new species from Kon Chu Rang Nature Reserve, Gia Lai Province, in the central highlands of Vietnam, is described and illustrated. It is morphologically similar to L. bokorensis, which was discovered in Bokor National Park, southern Cambodia, in the shape of the leaves, inflorescences and oran...

This paper presents new data on the orchid diversity of Vietnam obtained in 2020–2022. It comprises descriptions of two species new for science (Cleisostoma tatonii and Sarcoglyphis hiepii) and descriptions of four species new for the flora of Vietnam (Cleisostoma aspersum, Gastrochilus nanus, Micropera mannii and Trichoglottis ramosa). All species...

Bulbophyllum tseanum was found in Quang Nam Province. It is a new record for the orchid flora of Vietnam. Previously this species was recorded in Hong Kong and Hainan (South-East China). Living specimens were collected in Quang Nam province and flowering successfully in a private garden in Da Lat city, Lam Dong province. Based on morphological char...

Bulbophyllum phanquyetii, from Lai Chau Province was found and described as a new species for science. The new species looks similar to B. guttulatum and B. umbellatum but differs in the connate upper margin of lateral sepals, verruculose sepals and petals, and triangular stelidia. In addition, B. tianguii found in Ha Giang Province is firstly reco...

The taxonomic treatment of the genus Campanulorchis is herein presented. Short description, data on habitat, phenology, distribution, illustrations and identification key for all species are included. Campanulorchis globifera was firstly recorded for the orchid flora of Cambodia and C. thao firstly recorded in Laos.

Coelogyne sondangii is described as a species new for science. It allies to the group of former Panisea species with white flowers, namely C. albiflora, C. demissa, C. yunnanensis, C. panchaseensis, and C. sagittata, but differs from them in big flowers, narrowly spatulate lip with erose margin of lobes and irregularly denticulate column wings. In...

Raphiocarpus taygiangensis , a new species of Gesneriaceae from Tay Giang District, Quang Nam Province, Central Vietnam, is here described and illustrated. The new species is diagnostic by the combination of its long stem, serrate leaf margin, purple spots, purple longitudinal lines, and glandular short hairs inside corolla. Morphological distincti...

Based on the specimens from 2021-2022, a study on the diversity and distribution of Rubiaceae in Con Dao National Park in Ba Ria - Vung Tau province was defined and identified 73 species and 33 genera. Among them, 6 species have been added to Con Dao National Park, including Benkara depauperata, Benkara hoaensis, Benkara scandens, Psychotria serpen...

A yellow-flowered Chiloschista (Orchidaceae, Aeridinae) with brown-spotted tepals is described as a new species. It was initially collected in Son La Province, Thuan Chau District, and later flowered in cultivation when it was identified as a new specie. This new species resembles C. parishii and C. himalaica in habit, shape and color of the flower...

This paper presents new data on the orchid diversity of Vietnam obtained in 2015–2021. It contains descriptions of three new species (Cleisostoma furcatum, Malleola micrantha, Schoenorchis hungii), one new variety (Chiloschista parishii var. minutiflora) and one new form (Cleisostoma furcatum forma albiflora). Additionally six species, Ascocentrops...

Additional names not accounted for in recent treatments of the orchids of Myanmar are noted, along with some other ancillary studies. Nine new combinations are proposed, viz. Brachypeza uniflora, Eulophia citrina, E. pulchella, Holcosia pseudotaiwaniana, H. taiwaniana, Phreatia emarginata, P. minuscula, P. perpusilla, and Vanda hennisiana. One new...

An updated checklist of the family Burmanniaceae in Cambodia, Laos and Vietnam is provided. The checklist comprises a single genus, Burmannia, and 15 species, of which one is fully autotrophic, six species are partially mycoheterotrophic, and eight species are fully mycoheterotrophic (non-photosynthetic). Burmannia itoana earlier known only from Ja...

A species, new to science, is described from Son La province, Vietnam. The new species is similar to B. yongtaiense, B. layae and B. sridithii in the hairy lip at base but clearly differs by the papillose margin and inner surface of dorsal sepal and petals, lip without mid keel and dense hairs on lateral keels, stelidia 2 times longer than 3 simila...

Lasianthus kbangensis V.S.Dang, Vuong & Naiki, a new species belonging to Lasianthus sect. Nudiflorae of Rubiaceae from the Central Highlands of Vietnam, is described and illustrated. This new species is similar to L. oblongilobus H. Zhu, but differs in having larger leaves, longer petioles, smaller calyx (calyx lobes) and corolla, and the color of...

Acanthophippium sylhetense Lindl. (Orchidaceae) is reported as a new record for the Vietnamese flora.Taxonomic notes and a key to the species of Acanthophippium in Vietnam are also provided.

Species of the genus Burmannia possess distinctive and highly elaborated flowers with prominent floral tubes that often bear large longitudinal wings. Complicated floral structure of Burmannia hampers understanding its floral evolutionary morphology and biology of the genus. In addition, information on structural features believed to be taxonomical...

Two new species of shrubs in the genus Lasianthus Jack (Rubiaceae), L. naikii V.S.Dang & Vuong sp. nov. and L. sonlangensis V.S.Dang, Vuong & Quan sp. nov. from Kon Chu Rang Nature Reserve of Gia Lai Province in southern Vietnam, are described and illustrated. The similarities and differences of two new species with the morphologically closest alli...

Bulbophyllum mamillatum Vuong, Aver., V.S.Dang is described as a new species for science and B. retusum H. Jiang, D.P. Ye & J.D. Ya is reported as a new national record for the orchid flora of Vietnam. Both species belong to Bulbophyllum sect. Brachyantha Rchb.f. and were discovered in northern Vietnam. Description of new the species is presented....

Hapaline kimthoae K.Z.Hein, Vuong & V.C.Nguyen from Da Nang province, Vietnam, is described and illustrated as a species new to science. Description, colour plates, discussion of similar taxa, phenology, distribution and a preliminary conservation status assessment are provided. With this discovery, Vietnam now holds a total of five Hapaline specie...

The paper presents a taxonomic review of Bulbophyllum section Rhytionanthos for the flora of Vietnam and provides the key for its species' identification. A new species, B. truongtamii and a new variety, B. taeniophyllum var. denticulatoalatum are described for science. Bulbophyllum nodosum is reported for the first time from the country. Bulbophyl...

VIETBIO [Innovative approaches to biodiversity discovery and characterisation in Vietnam] is a bilateral German-Vietnamese research and capacity building project focusing on the development and transfer of new methods and technology towards an integrated biodiversity discovery and monitoring system for Vietnam. Dedicated field training and testing...

Gastrochilus pankajkumarii, found in the Central Highlands of Vietnam, is described as a new species for science. The protologue includes color analytical photos of the new species and data on phenology, ecology, and distribution. Morphological comparisons with similar species are presented.

Cirrhopetalum roseopunctatum is illustrated from the type specimen. It is found to be conspecific with the later Cirrhopetalum annamense. In Bulbophyllum the combined entities must be known as B. annamense due to the earlier B. roseopunctatum Schltr.

In our paper entitled: “Notes on the genus Chamaeanthus (Orchidaceae, Epidendroideae, Vandeae, Aeridinae) with a new species from Vietnam”, on page 134, while making new combinations, a full and direct reference to the place of publication for the basionyms were missing. This goes against the Article 41 of the International Code of Nomenclature for...

A new species, Chamaeanthus averyanovii is described from Vietnam. It resembles C. brachystachys in many features but can be differentiated on the basis of leaves and morphological details of flower. The manuscript presents description, illustrated color plate and data on its phenology, ecology, and distribution. Morphological resemblance of the ne...

Mycaranthes latifolia Blume, distributed from Peninsular Malaysia, Borneo, Sumatra to Java is now reported for the first time in Vietnam. A morphological description, colour plate and line drawings, information on habitat and phenology are provided. An identification key to the species of Mycaranthes in Vietnam is also provided.

Bulbophyllum xuansonii belonging to section Brachystachyae, discovered in Ninh Binh and Son La provinces is described here as a new species for science. This species is similar to B. xylophyllum and B. gracilipes but can be easily distinguished by the smaller habit and shape of tepals and stelidia. Additionally, B. gracilipes found in Lam Dong Prov...

The new species, Bulbophyllum manhdatii (B. sect. Brachyantha) discovered in Da Lat Plateau, Lam Dong Province (southern Vietnam) is described here. This new species is close to B. pumilio but clearly differs in densely crowded pseudobulbs and their shape, shorter inflorescence, lateral sepals forming a narrow acute tube slightly flattened at the b...

The mycoheterotrophic genus Thismia shows a great number of structural and ecological traits which are rare or unique for angiosperms. Pollen morphology of this genus is still poorly known. Pollen of Thismia was reported to be porate with one to several pores. Position of the pores is unknown, and therefore, the pollen type has not been established...

A new species from the Central Highlands of Vietnam, Bulbophyllum vulinhae, referrable to Bulbophyllum sect. Racemosae (Orchidaceae) is described and illustrated. In addition, B. allenkerrii from the same section is reported from Vietnam for the first time. Morphological description, illustrations, data on ecology and phenology for both species are...

A Bulbophyllum is described as new to science. Bulbophyllum baosangii was found in Ha Giang province, Vietnam. It resembles Bulb. nipondhii (Seidenf.) and Bulb. thaiorum (J. J. Sm.), but can be recognized by its habit, flower details and colour of the flowers. The paper presents a morphological description and illustrations based on collected mater...

A study to assess the diversity of medicinal plant resources in Kon Ka Kinh National Park in Gia Lai province was carried out. A total of 486 species of medicinal plants belonging to 348 genera, 112 families of five phyla of vascular plants were identified. There are 10 families with the most species (182 species) accounting for 37.4% of the total...

Dendrobium parahendersonii discovered in southern Vietnam is described as new species to science. It belongs to D. sect. Crumenata, and resembles D. hendersonii and D. exile in having a filiform, reed-like stem swollen at the base into a quadrangular ellipsoid pseudobulb and flowering from the leafless part of stem but differs clearly in the detail...

The paper provides a short review of Bulbophyllum species recorded in Laos and Vietnam during the two last decades and continues the publication of results of our successive studies of the genus in this area. It presents data on two new species for science discovered in Laos (Bulbophyllum pachypodum) and Vietnam (B. neglectipetalum), one lesser kno...

An overview of the orchid genus Corybasin Vietnam is presented. It was known to be represented by a single species, C. annamensis. In this article, we report two new records, C. himalaicus,and C. geminigibbus. Detailed descriptions, synonyms, type data, information on ecology and phenology, distribution and color plates are provided for all thre...

Recent fieldwork in Ha Giang province, Northern Vietnam resulted in the collection of Pholidota longipes, a species only known in South‐Central China. Thus, we herein report the first record of the species for the Orchid Flora of Vietnam. Morphological description and illustrations based on living collected materials, data on phenology, geographica...

Nghiên cứu đa dạng họ Lan (Orchidaceae) ở Nam Bộ được thực hiện trong hai năm 2018 và 2019 nhằm mục tiêu đánh giá được thực trạng đa dạng thành phần loài lan ở vùng này. Các phương pháp được sử dụng bao gồm: phương pháp điều tra thực địa và thu mẫu, phương pháp so sánh hình thái kết hợp với tra cứu các tài liệu chuyên ngành về họ Lan. Kết quả nghiê...

Aspidistra peltata, a new species morphologically allied to A. tonkinensis (= A. fungilliformis subsp. formosa; A. formosa) discovered in northern Vietnam, is described and illustrated. From the closely related A. tonkinensis, the new species differs in having an erect stem 4–14 cm tall, much smaller leaves, smaller flowers, filamentose stamens, a...

The new species discovered in Thanh Hoa Province of northern Vietnam described here as a new species for science. It is similar to B. muscicola but differs in smaller habit, inflorescence shorter than leaves, shorter lateral sepals with unequally lobed blunt apex, and slender stelidia. The newly described species also can be compared with B. japoni...

A new variety, Bulbophyllum blaoense var. flavescences (B. sect. Cirrhopetaloides) discovered in southern Vietnam is described here. In addition, two species, B. caudatum and B. kwangtungense (B. sect. Desmosanthes) found in the northern part of the country are firstly recorded and documented for the flora of Vietnam. Morphological description and...

Zingiber #magang and Z. #tamii, two new species of #Zingiber sect. #Cryptanthium (#Zingiberaceae) from central #Vietnam are described and illustrated. Information on their distribution, ecology, phenology, uses and vernacular names are provided. A preliminary IUCN conservation assessment of each of these species is proposed. A key to species of Zin...

The new species, Gastrochilus dresslerii (G. sect. Microphyllae) discovered in northern Vietnam (Ha Giang Province) is described and illustrated, and data on its phenology, ecology, and distribution is provided. Morphological resemblance of discovered plant with allied species are also discussed.

Thismia is characterized by an exceptionally complicated floral morphology that is currently not understood properly. In the taxonomic literature, descriptive rather than morphological terms are often applied to parts of the flower in Thismia, relating to the general appearance of the floral organs instead of their precise homologies. Precise under...