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Introduction
I am working on plant diversity, taxonomy, conservation, and reproductive biology in Vietnam
Publications
Publications (53)
This study provides color illustrations and describes the morphological characteristics and distribution of Camellia pitardii and Camellia mairei var. lapidea, species formerly considered endemic to China but recently discovered and recorded in the flora of Vietnam.
As a primary source of anticancer camptothecin, Camptotheca (Nyssaceae) is an economically valuable genus and has long been recorded as endemic to China. Here, Camptotheca is reported as a new record to the flora of Vietnam with the discovery of a wild population of C. acuminata from Lai Chau Province of northern Vietnam. Based on the consultation...
Camellia pyriformis is described, illustrated, and placed in section Calpandria. Morphological features of this new species are young branches villous; leaves above pubescent, a long midrib, below pubescent; petiole falcate, densely villous; flowers solitary or geminate; pedicel very short, pubescent; bracteoles sparsely pubescent on both sides; se...
Begonia tui, a new species of sect. Coelocentrum, is described and illustrated here. It was collected during expeditions carried out on a limestone hill in Quang Binh Province, Central Vietnam. The new species is morphologically similar to B. mollissima in its rugose, widely ovate lamina. However, the new species can be distinguished by the margin...
Pottingeria acuminata Prain (Celastraceae), collected from Son La Province, northern Vietnam near Laos is reported here as a new genus and species record for the flora of Vietnam. The species differs from all other Celastraceae very well by its leaves which are distichous, venation basally triplinerved, other nerves not distinct. Taxonomic notes, d...
Aristolochia austroyunnanensis S. M. Hwang (Aristolochiaceae), a species endemic to southern China (Yunnan and Guangxi provinces), is newly recorded for the flora of Vietnam. This newly recorded species belongs to subgenus Siphisia and is most similar to Aristolochia petelotii O. C. Schmidt and A. fangchi C. Wu ex L. D. Chow & S. M. Hwang. Detailed...
Surveys in montane forests in northern Vietnam have revealed one new species and two new records of Begonia. The new species, B. saxifragoides resembles B. minhaniae but is distinguished by the orbicular to reniform (vs. broadly ovate) leaves with rounded (vs. acute to acuminate) apex, the petioles densely covered with pilose or villous (vs. subapp...
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 plant species, Camellia vanlangensis, belonging to the Archecamellia section is described from Thanh Hoa Province, northern Vietnam. It grows up to 8 m tall and has big golden yellow flowers up to 8 cm wide. The flower is a solitary, subterminal, cup-shaped, with glabrous pedicel, 5-6 persistent bracteoles, 9-10 persistent orange-green sepals...
In order to accurately identify ginseng species (Panax spp.) that grow naturally in some Northern provinces of Vietnam, we collected 30 natural ginseng samples and used nuclear genetic region (ITS-rDNA) for current analysis. The success rate for nuclear genomic region PCR (ITS-rDNA) amplification is 100%. The bidirectional sequence read success rat...
Begonia ngocbonii, a new species from North Vietnam is here described and illustrated. It resembles B. pellionioides Y.M.Shui & W.H.Chen, but is distinguishable by its hairy (vs. glabrous) stem, shorter inflorescence up to 1 cm (vs. ca. 5 cm or longer), 2-tepaled staminate and pistillate flowers (vs. 4-tepaled staminate flowers and 5-tepaled pistil...
We summarize the knowledge on taxonomy and distribution of the genus Parnassia in Vietnam. Two species of the genus are found in Vietnam. We report additional records of P. wightiana, which appears to inhabit the provinces Ha Giang and Yen Bai. We provide detailed morphological description of the Vietnamese populations of this species, and discuss...
A new species of Aspidistra, A. sonlaensis, is described and illustrated from Son La Province in northern Vietnam. The new species is morphologically close to A. micrantha, but differs in number of perigone lobes, anther position and pistil shape. The new species is accessed as Data Deficient (DD) according to the IUCN categories and criteria.
This research provides a description and illustrations for a new species from the Phong Nha-Ke Bang National Park, Cynanchum quangbinhense. The distribution, habitat, phenology and conservation assessment for the species are also presented. The new species differs from closely related species, C. ovalifolium in many characters such as leaf shape, i...
Reliable estimates of forest productivity at the site scale can guide site-specific forest management. However, the best methods to evaluate productivity of natural forest sites, and in particular secondary natural forests, remain undefined. In this study we: (1) applied an indirect method for estimation of the potential productivity of a forest si...
Vietnam is one of the richest areas in the diversity of Begonia (Begoniaceae) in Mainland Southeast Asia with more than 90 recorded species. In this study, we recorded an additional species of Begonia for the flora of the country. The specimens of newly recorded species, Begonia wenshanensis C.M. Hu ex C.Y. Wu & T.C. Ku were collected from 2019 to...
Vietnam is an important hotspot for Begonia in Southeast Asia. Due to its broad latitudinal range and varied terrain, it has developed a rich biodiversity of flora, of which the genus of Begonia is one of the most striking taxa. In this study, we provide a checklist of Begonia found in Vietnam, including a new species: B. jubar V.T.Pham & C.W.Lin,...
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...
Vietnam experienced significant forest cover change during the last half of the twentieth century, and restoration of natural forests have increased since the 1990s. This study developed comparisons of human-intervened and naturally restored forests in Cat Ba Biosphere Reserve, Vietnam in order to gain a better understanding of restoration options...
An ecological understanding of natural forests after anthropogenic intervention is important for sustainable forest management. This study analyzed the overstory characteristics (species composition, growth, and diameter distribution) and regeneration (species richness, density, and height distribution) in natural limestone forests in Cat Ba Biosph...
This study mapped potential areas for planting golden camellias in Cao Bang province, North Vietnam. Natural conditions (elevation above sea level, annual precipitation, and annual air temperature), where 6 golden camellia species (Camellia impressinervis, C. kirinoi, C. megasepala, C. tuyenquangensis, C. hamyenensis, and C. tienii) naturally distr...
Dichocarpum hagiangense from Ha Giang province, northern Vietnam is described and illustrated. Diagnostic features of the new species are a short rhizomatous stem, (2-)3-foliolate or simple leaves, and pink-purple flowers. The described species is distinct from closely allied D. trifoliolatum in having longer sepals, shape and obcordate apex of pet...
Background: Anoectochilus orchids have been widely used as medicine. However, it has been overharvested in nature because of high commercial values. This study aims at identifying distribution ranges and ecological characteristics of Anoectochilus orchids serving for sustainable development and describing traditional uses by ethnic people in Lai Ch...
Two new species, Begonia dinhdui and B. bacmeensis are described from Vietnam. Begonia dinhdui is somewhat similar
to B. austrovietnamica C.-I Peng, C.W. Lin, D.D. Nguyen & N.D. Truong, a limestone tuberous species also occurring
in southern Vietnam. Both species have a periodically dormant habit and silvery variegated lamina, however, the new
spec...
Castanopsis boisii is a multipurpose forest tree, native to South China and Vietnam. The nut of C. boisii is edible and has been widely used as daily food. The study in North Vietnam indicated that more than 70% of stems and 80% basal areas of C. boisii were found in natural stands, indicating the availability of purely natural forests of C. boisii...
Understanding the requirements and tolerances of the seedlings of climax species is fundamental for tropical forest restoration. This study investigates how the presence and abundance of seedlings of a previously dominant, now threatened species (Dipterocapus dyeri Pierre), varies across a range of environmental conditions. Dipterocapus dyeri seedl...
Located in Tuyen Quang and Ha Giang Provinces, the Cham Chu Nature reserve (NR) has diverse plant ecosystem types, and its the flora is rich in species. However, the pteridophyte flora of Tuyen Quang and Ha Giang Provinces has not been so far generallystudied. This study presented results of three biotic surveys conducted on Cham Chu mountainsand a...
Located in Tuyen Quang and Ha Giang Provinces, the Cham Chu Nature reserve (NR) has diverse plant ecosystem types, and its the flora is rich in species. However, the pteridophyte flora of Tuyen Quang and Ha Giang Provinces has not been so far generallystudied. This study presented results of three biotic surveys conducted on Cham Chu mountainsand a...
Two new species, Begonia dinhdui and B. bacmeensis are described from Vietnam. Begonia dinhdui is somewhat similar to B. austrovietnamica C.-I Peng, C.W. Lin, D.D. Nguyen & N.D. Truong, a limestone tuberous species also occurring in southern Vietnam. Both species have a periodically dormant habit and silvery variegated lamina, however, the new spec...
Persian walnut, Juglans regia L., is a long-lived, wind-pollinated and deciduous tree, which produces large, woody, shelled and edible nuts. J. regia is one of the most economically important cultivated species for timber and nutritious nuts. Its nuts have medicinal importance for human health by high antioxidant capacity. J. regia has been planted...
Plus tree selection is the first step to improve production and quality in forestry. An individual-based method is widely used to select plus trees for timber production, timber form, freedom from diseases and insects. In this study, a method to select plus trees for flower production is described and named as a crown-area-based method. Both indivi...
Biotic and abiotic factors control aboveground biomass (AGB) and the structure of forest ecosystems. This study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam. A data set of 173 1-ha plots from 52 locations in undisturbed old-growth forests was developed. The results indicate that...
Camellia velutinaV.T. Pham, V.D. Luong & Aver. found in Phu Tho province, northeastern Vietnam is described and illustrated. The comparison between the new species and closely related species is provided.
Camellia impressinervis is known as a golden camellia, naturally distributing in China and Vietnam. Leaves and flowers of golden camellias contain active ingredients such as polysaccharides, polyphenols, saponins, and flavonoids. It was found to be able to inhibit the transplanted cancer, lower blood lipid, lower cholesterol, and prevent atheroscle...
Characterising the successional stages of secondary forests recovery is key to understanding and aiding forest landscape restoration. To determine the successional stages - and recovery pathways - for mixed dipterocarp forest in Dong Nai Biosphere Reserve (DNBR), Southern Vietnam, we used a dataset of 61 pairs of 1000 m² plots, representing a range...
Castanopsis dongnaiensis T.S. Hoang & V.N. Nguyen sp. nova (Fagaceae) from Dong Nai Culture and Nature Reserve, Dong Nai Province of Vietnam is described and illustrated. It is morphologically similar to C. ferox, but can be distinguished from it by its leaf margins which are serrate on 1/3 to the apex, a symmetric leaf base, cupule with decurved s...
A new species, Quercus xuanlienensis Binh, Ngoc & Bon, is described from Xuan Lien Nature Reserve, Vietnam. The new species is morphologically similar to Q. edithiae Skan, in having 8–11 pairs of secondary veins, bowl-shaped cupules and ellipsoid to cylindrical-ellipsoid and basally convex nuts. It differs in having serrulate leaf margins only at a...
Tropical forests are among the most diverse and threatened ecosystems. The montane forests in the Central Highlands of Vietnam have outstanding biodiversity and unique species, yet we know little about them. This study characterised the natural forest in Dam Rong, Ha Nung and Yok Don. We identified six discrete communities and their indicator speci...
Phyllagathis phamhoangii V.T.Pham, T.C.Vu & Ranil is described and illustrated from Quang Nam province, central
Vietnam. Diagnostic features of the new species are the short acaulescent rhizomatous herbs with pink flowers. The
described species is distinct from the closely allied P. nanakorniana in the sparse hairs on all its parts except petals an...
Arisaema lihengianum J. Murata & S. K. Wu, a previously known species only in China, is newly recorded from Vietnam. It is found in primary limestone forest in Na Hang Nature Reserve, Tuyen Quang Province, Vietnam.