Indigenous use and bio-efficacy of medicinal plants in the Rasuwa District, Central Nepal
© Uprety et al; licensee BioMed Central Ltd. 2010
Received: 5 October 2009
Accepted: 26 January 2010
Published: 26 January 2010
By revealing historical and present plant use, ethnobotany contributes to drug discovery and socioeconomic development. Nepal is a natural storehouse of medicinal plants. Although several ethnobotanical studies were conducted in the country, many areas remain unexplored. Furthermore, few studies have compared indigenous plant use with reported phytochemical and pharmacological properties.
Ethnopharmacological data was collected in the Rasuwa district of Central Nepal by conducting interviews and focus group discussions with local people. The informant consensus factor (FIC) was calculated in order to estimate use variability of medicinal plants. Bio-efficacy was assessed by comparing indigenous plant use with phytochemical and pharmacological properties determined from a review of the available literature. Criteria were used to identify high priority medicinal plant species.
A total of 60 medicinal formulations from 56 plant species were documented. Medicinal plants were used to treat various diseases and disorders, with the highest number of species being used for gastro-intestinal problems, followed by fever and headache. Herbs were the primary source of medicinal plants (57% of the species), followed by trees (23%). The average FIC value for all ailment categories was 0.82, indicating a high level of informant agreement compared to similar studies conducted elsewhere. High FIC values were obtained for ophthalmological problems, tooth ache, kidney problems, and menstrual disorders, indicating that the species traditionally used to treat these ailments are worth searching for bioactive compounds: Astilbe rivularis, Berberis asiatica, Hippophae salicifolia, Juniperus recurva, and Swertia multicaulis. A 90% correspondence was found between local plant use and reported plant chemical composition and pharmacological properties for the 30 species for which information was available. Sixteen medicinal plants were ranked as priority species, 13 of which having also been prioritized in a country-wide governmental classification.
The Tamang people possess rich ethnopharmacological knowledge. This study allowed to identify many high value and high priority medicinal plant species, indicating high potential for economic development through sustainable collection and trade.
Ethnobotany reveals historical and present plant use to fulfil a wide variety of human needs [1, 2]. Documenting indigenous knowledge through the ethnobiological approach is important for species conservation and sustainable resource use . Furthermore, such studies are often significant in revealing locally important plant species, sometimes leading to the discovery of crude drugs [4, 5], or contributing to economic development.
Globally, millions of people in the developing world rely on medicinal plants for primary health care, income generation and livelihood improvement . Indigenous people living on their traditional territory largely rely on medicinal plants for healthcare and they are therefore rich in ethnopharmacological knowledge. The interest in phytomedicine has been renewed over the last decade and several medicinal plant species are now being screened for pharmacological potential. According to Laird and Pierce , the world market for herbal remedies was worth 19.4 billion US$ in 1999. The global demand for medicinal plants is increasing and, in India alone, the market is expanding at an annual rate of 20% [8, 9]. Scientific research is needed to determine the active principles of traditional medicinal recipes and to evaluate their effectiveness, so that benefits could be equally shared among local peoples in the spirit of the Convention on Biological Diversity .
Medicinal plants play vital roles in the Nepalese livelihood  and the use of medicinal plants is frequent in several Nepalese regions [12–14]. It is estimated that only 15-20% of the population of Nepal - living in and around urban areas - have access to modern medicinal facilities, whereas the rest depend on traditional medicines . Nepal is a natural storehouse of medicinal plants [12, 15, 16]. Each year thousands of tons of raw material are exported, mostly to India, but also to Asia, Europe and America . The government of Nepal aims to promote medicinal plant use and conservation programmes for livelihood improvement and poverty alleviation through various policies . However, the contribution of this sector to the national economy is still nominal.
Document the medicinal plants used in the traditional healthcare delivery system of the Chilime Village Development Committee (VDC) of the Rasuwa district of Central Nepal,
Estimate use variability of medicinal plants, indicating informant agreement,
Evaluate the bio-efficacy of medicinal plants by comparing local use with findings from published phytochemical and pharmacological studies,
Identify priority medicinal plant species for the Rasuwa district.
Ethnopharmacological data was collected by conducting interviews and focus group discussions with local people (50% > 40 years old), from July to September 2007. A total of 50 household heads (56% male and 44% female) from the Chilime VDC of the Rasuwa district participated in the study. Participants were purposively selected to include key informants  like plant collectors, medicinal plant cultivators, traditional healers, and traders. Respondents were all from the Tamang ethnic group, predominant (65%) in the Rasuwa district. The majority (62%) of the respondents had no formal education, 18% had primary school education, 12% had secondary education, and 8% had university level education. Prior informed consent was obtained with the help of community workers  that also facilitated interviews and discussions with the local people. Consent was granted by the local people for the dissemination of their traditional knowledge.
Guidelines for the interviews and group discussions were developed to facilitate the collection of information. Interviews and group discussions were conducted to gather information on plant uses, parts used, and modes of utilization. A checklist was developed and used to determine what species were used to treat what kinds of diseases/disorders. Herbarium specimens were collected for those species for which field identification was not certain and brought back to the lab to facilitate identification using reference collections [26–29] and expert knowledge. The specimens are deposited at the Tribhuvan University Central Herbarium (TUCH).
where Nur is the number of individual plant use reports for a particular illness category, and Nt is the total number of species used by all informants for this illness category.
Medicinal plant species were ranked according to prioritization criteria developed by the Herbs and Non-Timber Forest Products Coordination Committee of Nepal and the National Medicinal Plants Board of India, and synthesized at the First National Trade Show and Seminar on Herbs, Herbal Products and Spices, held November 12-14, 2005 in Nepalgunj, West Nepal :
Quantity exported annually recorded by the District Forest Office
Average annual export to India and abroad
Annual industrial demand in Kathmandu
Ease of cultivation/domestication
Bulkiness (availability in large quantities)
Social acceptance for further processing
Availability of local processing techniques
Potential for further processing
Criteria accounting for availability, local knowledge and use, and market demand were given more weight. Indigenous uses determined from interviews and discussion groups, and phytochemical and pharmacological properties determined from a review of the available literature were compared for all species for which information was available.
Ailments treated and remedies formulation
Medicinal plants used to cure various ailments.
Asparagus racemosus, Berginia ciliata, Bistorta affinis, Cannabis sativa, Cheilanthes albomarginata, Dactylorhiza hatagirea, Fritillaria cirrhosa, Hippophae salicifolia , Hippophae tibetana, Lepisorus mehrae, Lindera nessiana, Mahonia napaulensis, Paris polyphylla, Potentilla fulgens, Primula sikimmensis, Rheum australe, Rhodiola himalensis, Rhododendron anthopogon, Vitex negundo, Zanthoxylum armatum
Fever and headache
Aconitum spicatum, Asparagus racemosus, Berberis asiatica, Bergenia ciliata, Delphinium himalayai, Drynaria propinqua, Geranium nepalense, Juniperus recurva , Lonicera myrtillus, Nardostachys grandiflora, Onychium japonicum, Paris polyphylla, Pieris formosa, Primula sikkimmensis, Rheum australe, Rhodiola himalensis, Swertia chirayita, Swertia multicaulis
Cuts and wounds
Aconitum spicatum, Amaranthus spinosus, Artemisia indica, Dactylorhiza hatagirea, Eupatorium adenophorum, Geranium nepalense, Lycopodium clavatum, Lyonia ovalifolia, Parmelia cirrhata, Parmelia sp., Valeriana jatamansi
Cough and cold
Abies spectabilis, Acorus calamus, Anaphalis contorata, Delphinium himalayai, Hippophae salicifolia , Juniperus recurva, Swertia chirayita, Swertia multicaulis, Valeriana jatamansi
Aconitum ferox, Entada rheedei, Fraxinus floribunda, Neopicrorhiza scrophulariiflora, Phymatopteris quasidivaricata, Valeriana jatamansi
Abies spectabilis, Ephedra gerardiana, Taxus wallichiana, Valeriana jatamansi
Weakness and dizziness
Cordyceps sinensis, Juglans regia, Nardostachys grandiflora, Rhododendron arboretum
Lyonia ovalifolia, Onychium japonicum, Phymatopteris quasidivaricata, Rubia manjith
Astilbe rivularis, Hippophae salicifolia
Anaphalis contorata, Myrica esculenta
Most people who participated in interviews and group discussions were familiar with the species used to deal with common ailments like cough and cold, digestive problems, fever, headache, skin infection, and in such cases plant based medicinal remedies were used on a regular basis. For complex problems like chest pain, menstrual disorders, rheumatism, or eye and kidney problems, people took advice from local traditional healers. Traditional healers believe in a form of sanctity of the curative power of medicinal plants. They thus keep secrecy over remedy formulation, believing that the medicines would lose their potency if revealed to other people.
Common forms of preparation methods for remedies made of medicinal plants.
Fresh plant parts are crushed with a stone pestle and mortar.
Obtained by squeezing or crushing plant parts and filtering through cloth. Sometimes requires addition of freshwater or other liquid for dilution.
Fresh plant parts are chewed.
Plant parts are plunged in water for a few minutes.
Plant parts are boiled in water and the extract (crude drug) is used.
Informant consensus factor
Informant consensus factor (FIC) for different ailment categories.
Number of taxa (Nt)
Number of use reports (Nur)
Informant consensus factor (FIC)
Fever and headache
Weakness and dizziness
Cuts and wounds
Cough and cold
Prioritization of medicinal plant species
List of priority medicinal plant species for the Rasuwa district of Central Nepal.
Prioritization score (/50)
Nardostachys grandiflora DC.
Swertia chirayita (Roxb. ex Fleming) Karsten
Aconitum spicatum (Bruhl) Stapf
Delphinium himalayai Munz
Neopicrorhiza scrophulariiflora (Pennell) D.Y. Hong
Rheum australe D. Don
Fritillaria cirrhosa D. Don
Dactylorhiza hatagirea (D. Don) Soo
Valeriana jatamansii Jones
Taxus wallichiana Zucc
Zanthoxylum armatum DC
Bergenia ciliata (Haw.) Sternb
Paris polyphylla Sm.
Acorus calamus L.
Asparagus racemosus Willd.
Bio-efficacy of traditionally-used medicinal plants
Comparison of local use and phytochemical/pharmacological properties of medicinal plants.
Local use coherent with known phytochemical/pharmacological properties
Root paste is taken for joint pain.
Alkaloid extract may possess anti-inflammatory properties .
Rhizome is used for cough/cold, and throat pain.
Antimicrobial properties .
Root paste is applied on cuts and wounds.
Contains several chemical compounds, including tannins (coagulant), steroids (muscle building), flavonoids (antimicrobial), and volatile oils (antiseptic) .
Leaf paste is applied on cuts and wounds.
Antimicrobial properties .
Tuber paste is used for fever, stomach ache, and diarrhoea.
Ethanol and aqueous extracts from the tubers exhibit significant antidiarrheic activity .
Cambium paste is used for rheumatism and pith paste is used for eye problems.
Whole plant juice is taken to treat indigestion, fever, diarrhoea, and dysentery.
Plants possess antipyretic, antidiarrheic, diuretic and expectorant properties .
Plant paste is taken for stomach problems.
Diuretic, anti-emetic, anti-epileptic, painkilling, anti-inflammatory, and antipyretic properties .
Whole plant juice is taken as a tonic.
Leaf juice is applied on cuts and wounds.
Contains haemostatic ayapanin .
Bark infusion is used for body pain.
Anti-inflammatory, anti-oxidative and skin regenerating activities .
Plant juice is taken for stomach disorders.
Plant contains steroidal alkaloids effective against stomach disorders .
Fruit juice is taken for cough, diarrhoea, and menstrual disorder.
Contains high levels of flavonoids (with antimicrobial properties and effectiveness against menopausal symptoms), carotenoids and vitamin C .
Fruit juice is taken for stomach disorders.
Contains high levels of flavonoids (antimicrobial), carotenoids and vitamin C .
Fruit juice is taken as a tonic.
Seeds are diuretic and a nervous system depressant .
Fruit juice taken for diarrhoea.
Essential oil extracted from fruits possess significant antimicrobial activity .
Pollen paste is used on cuts and wounds.
Contains anti-inflammatory alkaloidal-types of compounds .
Whole plant juice is taken to treat headache and high altitude sickness.
Ethanol extract from roots showed anticonvulsant activity and are a nervous system stimulant .
Used for body pain.
Contains glycosides .
Used for skin problems.
Onychin-a flavanone glycoside is cytotoxic .
Root paste is taken for fever, vomiting and worms.
Root paste is used against gastritis.
Possess antibacterial and anti-inflammatory properties .
Root juice is taken for fever, indigestion, diarrhoea, and stomach ache.
Purgative, astringent, and anti-amoebic effects .
Flower is chewed for stomach ache.
Volatile components possess antimicrobial activities .
Root paste is applied over scabies and other skin diseases.
Whole plant juice is used for fever, cold and headache.
Leaf juice is drunk to treat respiratory problems.
Antimicrobial effect .
Rhizome paste is applied on cuts and wounds and joint problems. Rhizome is chewed to treat throat pain.
Analgesic, carminative, antispasmodic, antiseptic, expectorant, diuretic and sedative properties .
Seed paste is used for worms.
Fruits are crushed, pickled and taken for stomach ache and indigestion.
Ethanol fruit extract is antibacterial against gram positive bacteria (Bacillus subtilis, Staphylococcus aureus, Mycobacterium phlei) .
Traditional use of medicinal plants in Chilime
Altogether, 56 species of medicinal plants were identified as being used in traditional medical systems in the Rasuwa district of central Nepal. As indicated for the Dolkha district, having more or less the same economic, social and ecological characteristics, reliance on medicinal plants for health care was associated with poverty, lack of accessibility to modern healthcare facilities, and traditional belief about plant effectiveness . Herbs are the primary source of medicinal plant species, followed by trees, most likely because herbs are more abundant. It is believed that the more abundant a plant is, the more medicinal virtues it may possess [20, 33]. The ease with which plants can be collected, stored, and transported and the ease with which bioactive compounds can be extracted are also factors that contribute to the preference for herbs . Moreover, most species used in the traditional health care system of the Chilime VDC are harvested from the wild. This is common practice all over the world, as was observed in Cameroon , Uganda  and Peru , for example. The preference for root to prepare traditional remedies follows the scientific reasoning that roots generally contain high concentrations of bioactive compounds .
The average FIC value for all ailment categories was 0.82, indicating a high level of informant agreement compared to similar studies conducted in Mexico [30, 31, 38], Belize , and India , for example. Particularly high FIC values were obtained for ophthalmological problems, tooth ache, kidney problems, and menstrual disorders (Table 3), indicating that the species that are traditionally used to treat these ailments are worth searching for bioactive compounds: Berberis asiatica, Astilbe rivularis, Juniperus recurva, Swertia multicaulis, and Hippophae salicifolia. The latter three species, as well as Valeriana jatamansi, are also of interest as they are traditionally used to treat three or four different ailment types (see Table 1).
Bio-efficacy of medicinal plants
Empirical observations on the use of medicinal plants by the Tamang people of the Rasuwa district needed to be substantiated with phytochemical and pharmacological studies in order to corroborate their bio-efficacy. Such concerns were raised by ethnomedicinal studies carried out in Nepal, but few studies have provided the needed evidence [19, 20]. Comparison of local uses and phytochemical/pharmacological properties for 30 medicinal plant species showed that traditional use was coherent with known phytochemical or pharmacological properties in 90% of the cases (Table 5).
Comparison of the information on traditional medicinal plant use in the Rasuwa district with ethnobotanical studies conducted in other areas of Nepal [15, 18, 20, 41] shows similar results for many species. This is of significance because identical plant use by different people from different areas may be a reliable indication of curative properties. Like in other rural communities of Nepal [15, 20, 42, 43], knowledge about traditional uses of medicinal plants is transferred from the household seniors and other elders. In many cases, this knowledge is transmitted orally, from generation to generation, and remains confined to a limited group of people . Documentation efforts undertaken by Nepalese researchers in order to document traditional use of medicinal plants [13–15, 20, 45] should continue, especially as the results presented here place traditional and scientific knowledge on equal footing.
Sustainable management and use of medicinal plants
The criteria used to identify priority medicinal plant species  are very practical and useful in the regional context and are highly reliable as they were synthesized by experts based on national and international data. The 16 priority species identified here are highly valued on national and international markets . Importantly, 13 of the 16 species prioritized in the present study are also priority species identified by the central Government of Nepal, which recognized 30 medicinal plant species for promotion of commercial use and trade . Therefore, it is important to consider these species to implement policy and to guide management authorities of the Rasuwa district for proper management and use of medicinal plants to benefit local people in their traditional healthcare delivery systems and income generation activities [6, 47].
Unsustainable harvesting, over-exploitation and habitat degradation have been identified as major threats to the sustainability of medicinal plants in the district. The medicinal plants sector has the potential to achieve sustainability, given the availability of resources, people's willingness to participate in conservation programmes, and the priority given to the sector by the government and other organizations. Sustainable harvesting, effective domestication methods, community participatory management, and the provision of information, education and awareness programmes to the community are key strategies that can help optimize the benefits of the medicinal plants sector in Nepal .
The Tamang people of the Rasuwa district of central Nepal possess rich ethnopharmacological knowledge and therefore use several medicinal plant species in their traditional healthcare delivery system. The striking coincidence between traditional plant use and scientifically-proven phytochemical and pharmacological properties shows that the traditional remedies are an important and effective part of indigenous healthcare systems in the district. However, published information on phytochemical and pharmacological properties are still limited for many plant species used in the district. Detailed phytochemical and pharmacological studies of traditionally-used medicinal plants is thus an important line of research to pursue, especially for species showing high informant consensus, like Astilbe rivularis, Berberis asiatica, Hippophae salicifolia, Juniperus recurva, and Swertia multicaulis. Medicinal plants provide huge opportunities for community development and livelihood improvement. However, local people are often deprived of the benefits from these resources . Proper management of high-value and high-priority medicinal plants could serve as a sustainable income source for the communities. This would in turn help generate incentives for biodiversity conservation, thus ensuring the long-term availability of medicinal plants for indigenous and commercial uses.
We are thankful to the local people of the Rasuwa district, Nepal for their participation in the study and for sharing their valuable knowledge. We are also grateful to the Flemish Interuniversity Council (VLIR) of Belgium for providing financial support for this study, and to R. C. Poudel for providing a valuable contribution to the development of this study.
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