Ethnomedicinal knowledge of a marginal hill community of Central Himalaya: Diversity, usage pattern and conservation concerns


 Background

Indigenous communities use wild plants to cure human ailments since ancient times, such knowledge has significant potential for formulating new drugs and administering future health care. Considering this the present study was undertaken to assess use value, diversity, and conservation concerns of medicinal plants used in traditional herbal care system of a marginal hill community in Bageshwar district of Uttarakhand in the Central Himalayan region of India.

Methodology

Extensive surveys were made in 73 villages to gather information on ethnomedicinal use of plant species used in traditional herbal healing system. A total of 100 respondents were identified (30 herbal healers called ‘ Vaidyas’ and 70 non-healers/natives) and interviewed using semi-structured questionnaires, target interviews and group discussion. Some important indices such as the use value index (UV), relative frequency citation (RFC), cultural importance index (CI), and informant consensus factor (F ic ) were calculated for the medicinal plants included in the present study.

Result

It was recorded that the community use a total of 70 species with 64 genera and 35 families for curing various ailments. Family Lamiaceae recorded maximum number of medicinal plants. 21 species used most extensively in traditional health care system. The major parts of the identified plants used for treatment of various ailments were root/rhizome and leaf. The most common methods used for preparation of these plants were decoction and infusion. Ocimum basilicum L., Cannabis sativa L., Citrus aurantifolia (Christm) Sw., Curcuma longa L.and Setaria italic L. had the highest rate of use report. RFC value ranged between 0.03 to 0.91 with highest values for Setaria italica, Zingiber officinale, Ocimum basilicum, and Rephanus sativus . The traditional knowledge is passed verbally to generations and needs to be preserved for the future bio-prospecting of plants that could be a potential cure to any future disease.

Conclusion

In recent years the community has access to modern hospitals and medicinal facilities, although a considerable number still prefer medicinal plants for curing select ailments. It is suggested that these ethnomedicial species need to be screened and evaluated further for their effectiveness for pharmacological activity. Also, significant efforts are required to conserve traditional knowledge and natural habitats of wild medicinal plants.


Background
Medicinal plants have been utilized for the treatment of various diseases since ancient times, thus form an important element of aboriginal curative systems. The Indian Rishis first documented the use of medicinal plants in the form of Samhitas. Charak Samhita (1000-800 BC) and Shushrut Samhita (800-700 BC) by Maharshi Charak and and Maharshi Shashurut, respectively, are the baselines of the Indian Medicinal System. Maharshi Charak mentioned over 500 medicinal plants, out of which 340 plants used in the production of herbal medicine [1,2]. AYUSH (i.e., Ayurveda, Unani, Siddha, and Homeopathy) is another traditional Indian health care system that is considered a great knowledge base in herbal medicines. Ayurveda reports over 2000 medicinal plant species, Siddha 1121 plant species, Unani 751 species, and homeopathy 422 species [3]. Nearly 70-80% population worldwide still relies on traditional medicinal systems for their primary health care because of their effectiveness, cultural preferences, and lack of modern health care alternatives [4,5]. The global demand for herbal medicine continues to increase over the past few decades. The earlier studies stated that out of 250,000 flowering plants in the world, only less than 10% have been screened so far for their medicinal potency, and still, 90% remains unexplored [2]. In recent times, there is an increased interest regarding the use of the medicinal plants to develop new drugs and medicines for fulfilling the demand of a growing population [6][7][8]. Therefore, the information on plants of ethnomedicinal importance holds high potential. Uttarakhand Himalaya is a mountainous region in northern India that has a unique geography, rich biological resources, cultural heritage, and diverse climatic conditions which supports the highest number of medicinal plant species [9]. Over two-third population live in rural areas and depend on diverse natural resources to fulfill their need for food, fuel, fodder, timber, medicine, etc. Communities use a large variety of medicinal plants for treating diverse ailments [10,11]. However, it is strongly being realized that the indigenous knowledge related to herbal medicines is continuously being eroded despite high significance to humanity. The subject needs further research such as documentation of potential medicinal species, analyzing their active constituents, clinical trials for validations, and developing new drugs and medicines [8][9][10][11][12]. Considering this, the present study was undertaken. We argue that sustainable management and conservation of medicinal plants can be achieved when information about their use for treating ailments and traditional herbal practices within particular areas are available. Such information is strongly desired to be preserved from being lost for the use of both the present and the future generations. For the purpose of this study, we selected marginal community and local herbal practitioners (Vaidyas) of Bageshwar district in Uttarakhand state in north India and documented ethnomedicinal plant diversity and traditional medicinal practices being used by them. Efforts were also made to scientifically validate and interpret the data using several indices such as relative frequency citation (RFC), use report (categorical and disease-based), cultural importance index (CI), and informant consensus index (Fic) so as to verify the homogeneity, importance, and the cultural similarity of the medicinal plants in communities. It is expected that the qualitative and quantitative information generated from the study will have immense utility for the conservation and sustainable utilization of medicinal plants as well as for managing the traditional health care system.

Study area
This study aimed to investigate the medicinal species used by the marginal hill community living in remote and high-altitude areas where medical health care facilities are not easily available. These practices are being used since eternity descended from the inherited knowledge of the locals and indigenous population of Uttarakhand. The study was carried out at Bageshwar district (geographical area 1687.8 km 2 ) of Uttarakhand state and lies between latitudes 29°42′ 40″ to 30°18′ 56″ N and longitudes 79°23′ to 80°10′ E (Fig. 1). The district is situated on the confluence of Gomti river and Saryu river which is a tributary of Kali river. It is bounded by Almora district in the southwest, Chamoli district in the north and northwest, and Pithoragarh district in the east. Administratively, the district is divisible into four Tehsils, viz., Bageshwar, Kapkot, Kanda (Sub-tehsil), and Garur, and three blocks, viz., Bageshwar, Garur, and Kapkot. There are 947 revenue villages, out of which 874 villages are inhabited, and 73 villages are uninhabited. As per the 2011 census, the total population of Bageshwar district is 259,898 (male 48%, female 52%) with 96% living in the rural areas.
The community of the area is divided into 3 categories, viz., General, Scheduled Class (SC), Scheduled Tribe (ST), and majority of them involved in primary sector (agricultural activities), while some also work in secondary and tertiary sectors, such as private works, businesses, and government jobs. As such, the community is highly marginal with small and scattered land holdings, low production, and low income, therefore, highly dependent on natural resources. Male population outmigrates to earn better livelihoods that lead to continuous increase in fallow lands and culturable waste lands.

Data collection
The study was conducted in 39 villages covering Garur-Ganga valley (23 villages) and Saryu valley (16 villages) of Garur and Kapkot Blocks during 2016-2018. To fulfill the objectives of the study, extensive field visits were made to gather information from traditional herbal healers (Vaidyas) and indigenous people using semi-structured questionnaires, target interviews, and visual interpretation through snowball methodology. A total of 100 respondents were randomly selected for the present study from both valleys, 37 being male and 63 female respondents. Of them, 30 were Vaidyas (male 19, female 11). Female informants were given preference in view of their dominance in villages. The age group of informants varied between 30 and 83 years, although most of them were between 50 and 65 years of age (Fig. 2). The questionnaire contains information about the ethnomedicinal plants with their local name, parts used, habit, ailment treated by medicinal plants, and mode of utilization of herbal formulation. Two general meetings and interviews were also organized at each valley with Vaidyas and natives. The documented medicinal plant species were validated for identification using available literature [13][14][15][16]. The specimens matched with the herbarium lodged in CCRAS-RARI, Tarikhet, Ranikhet, Uttarakhand (acronym RKT), which houses largest medicinal plant herbariums in northern India. A few generally available species were matched with the plant database of Centre for Socio-Economic Development deposited at G.B. Pant National Institute of Himalayan Environment (GBP-NIHE), Almora, Uttarakhand.

The ethnobotanical analysis
The information on ethnomedicinal important species were recorded including the local names of the species, habit, their uses in different forms, the part used in the medical practice, mode of administration, and the condition of the plant (fresh or dry). The plants were classified into 12 main categories of ailments which were further divided into different respective subcategories based on disease and affected body part. The data were then statistically analyzed for different parameters. To enhance the indicative value of the ethnomedicinal study, suitable quantitative methods and approaches were used in the form of indices, such as relative frequency of citation (RFC), use report (based on illness, based on taxa), cultural importance (CI), and consensus factor of informants (Fic).
Use-report values (UR) provides information on the total number of reported uses for each species. It is similar to the use value of a species, but for use report, the number of events (interviews), the process of asking one informant on one day about the uses they know for one species, is one because the respondents were interviewed only once. And response use values are broken down by the number of uses reported for each plant species part.
Use-value index (UV) depicts the importance of each species for each informant and calculated by UV = ∑U/N formula where U is the number of uses quoted in each interview by N, number of informants. Use values are high when there are many useful reports for a plant representing its importance and come within reach to zero (0) when the use reports are low [17]. Relative frequency citation (RFC) index reveals the usage importance of a particular species used by different informants. The index is calculated by dividing the total number of informants referring to a particular taxon with the total number of informants (RFC = FC/N) where FC is the total number of informants that referred to the taxon, and N is the total number of informants [18].
Cultural importance index (CI) is estimated for each locality as the summation of Use-Report (UR) in every use category mentioned for a species in the locality divided by the total number of informants. This index provides an implication of the involvement of a particular taxon in the community, and a greater value signifies that a particular is widely distributed among communities. A null value indicates non-existence of the species in the area. CI is calculated as CI = UR/N where UR is the total number of use reports for each species in every category of illness mentioned, and N is the total number of informants [19].
Informant consensus factor (Fic) is used to test the consistency of information knowledge in treating a particular illness category. The values obtained are near one (1) for welldefined selection criteria in the community and/or if the information is exchanged between the informants. A value approaching zero (0) represents that the plants are chosen randomly, and/or there is no information exchanged between the communities about their use. Fic is calculated as Fic = (Nur − Nt)/(Nur − 1), where Nur refers to the number of use reports for a particular use category, and Nt refers to the number of taxa used for a particular use category by all informants [20].

Ethnomedicinal uses of plants and mode of practice
The residents of different age groups were surveyed to assess the ethnomedicinal uses of plant species (Fig. 2).
The survey revealed that a total of 70 medicinal plant species varying from 35 families and 64 genera have been used by the inhabitants of 39 villages for different (Table 1). Family Lamiaceae recorded maximum species (8) followed by Asteraceae (6 species), Fabaceae (5 species), Rosaceae (4 species), and Apiaceae, Liliaceae, Ranunculaceae, Rutaceae, and Zingiberaceae (3 species each). The remaining families were represented with just one or two species. Almost all the species are widely used by the community. Of the total documented medicinal plant species, the herbaceous habit (51 species) was the most dominant life form, followed by the tree (10), shrub (7), and climbers (2 species) (Fig. 3).
It was interesting to note that nearly 70% population still use prescription of Vaidyas for common ailments, although the Vaidyas were having an age of > 50 years. The diseases cured by Vaidyas comprised fever, stomach problems, cough, cold, headache, etc. The most common plant parts used were root/rhizome, followed by leaf, whole plant, seeds, fruits, flower, and bulb and latex (Fig.  4). The collection of plant parts was very selective keeping into consideration the time of collection, plant matureness, and quantity of use thus ensuring a conservation approach. Vaidyas comprised sound knowledge and a species-specific method of preparing drugs to cure various ailments (Table 2). Making decoction and ingestion was the most common mode of plant part use (Fig.  5). Poultice and cooking were also favored for many medicinal plants. Another mode of application includes cooking and making into powder (9.42%), direct application (7.97%), emulsion and infusion (5.80%), and ointment (2.17%) (Fig. 5). A decoction is the most commonly used method to cure ailments in traditional herbal systems [21][22][23][24][25]. It is considered to extract all     [26]. The pleasant taste of the herbal drug can be attuned by adding together honey or sugar [27]. Ingestion and poultice were also common after crushing and/or mixing the plant parts with some solvent for application as paste and Band-Aid. In skeletal, muscle, and dermatological issues, application of plant parts as ointment was most prevalent. The community and Vaidyas identify each medicinal plant with a specific vernacular name. For example, Bergenia ciliata is identified by the community with a local name "Pattharchatta" (stone destroyer), and it is used in curing kidney stones. Plantago ovate is called "Jonkpuri" (jonk resembles worms) and is used in the treatment of Ascaris and other worms. Viola betonicifolia named "Garur-Jadi" (Garur means eagle), and it is used as an antidote to treat snake bites. Commonly, the community identifies a native name for species based on its local uses, ecology, physiology, anatomy, pharmacological activity, etc. [28].
It was recorded that the species were used to cure a total of 12 major ailments (Fig. 6). Most species were used for curing gastrointestinal and general health disorders. It was followed by species used for treating dermatological and respiratory problems.
Lamiaceae has been the most dominating family for ethnomedicinal uses in the trans-Himalayan zone of Nepal [29] and Garhwal Himalaya in India as well [30]. Although the people in remote areas are still dependent on the traditional herbal cure system, it is being practiced by a few elderly people only. The young generation is not interested to take up this profession given minimal profit [3,10,12]. The common plant parts used in the present study are similar to other investigations [31][32][33][34][35]. The roots being the storage part of the plant contain valuable bioactive compounds [36]. Apart from the root part, leaves also contain a high concentration of healthbeneficial secondary metabolites, phytochemicals, and essential oils, which contribute significantly to phototherapy or treatment of various health disorders [37][38][39][40]. The study reports 60% more species than reported earlier for the area under investigation [41][42][43][44][45].

Quantitative analysis of ethnomedicinal information
The use value of important ethnomedicinal species was also calculated to depict the number of uses reported by the informants related to the utility of a species for a specific ailment or different ailments (Tables 1 and 3). Two forms of use reports were analyzed; the URc defines the use of a particular species to cure specific ailments as reported by all the informants, while URd reports the sum of all the uses for a particular disease/  The usefulness of a species can be represented through its RFC value, which ranged 0.03 to 0.91 for different species (Table 1). Species with maximum RFC value were Setaria italica, Zingiber officinale, Ocimum basilicum, and Raphanus sativus which depict their higher use, while those with the least value comprised Duchesnea indica and Thalictrum foliosum.
The cultural importance index (CIs) specifies the distribution and importance of species in traditional herbal system, and the value ranged from 0.03 to 0.97. A total of 21 species have been identified as the most commonly used (Table 3). Ocimum basilicum, Cannabis sativa, and Citrus aurantifolia registered the highest cultural importance in the traditional herbal cure system. Low CI values specify that these species are either least used, or their use is declining in traditional herbal cure system [46].
An analysis of the informant consensus factor (Fic) for 12 broad treatment categories ranged between 0.92 and 1.0 ( Table 4). The data revealed high homogeneity as per local people for all treatments. The immuno-regulatory category was assigned the value 1 due to the presence of only one taxon in the particular category. Apart from this, hepatic health care and urogenital categories obtained the value of 0.98 indicating well-defined criteria among the local population and non-random selection of species for the ailment category. Asparagus recemosus, Glycine max, Hordeum vulgare, Polygonatum cirrhifolium, Punica granatum, Raphanus sativus, and Urtica dioica not only used in hepatic health care but also provide nutritive benefits and warm potency, particularly at higher altitude areas. These species are commonly used in the daily food habit of the local community. Also, a higher value of Fic verifies the distribution of the different species used for a specific ailment. The urogenital category, with only 4 taxa included, comes second in terms of CI as there is a widely accepted notion of using these species for such disorders. The higher value of informant consensus factor for all the ailment categories also implies that the documented species are the most commonly used in traditional healing system.
The gastrointestinal ailments comprised of 695 use reports from the total categories with a medicinal importance index value of 30.22 (Table 4). Some most sought species in this category are Cannabis sativa, Citrus aurantifolia, Angelica galuca, Ajuga parviflora, and Emblica officinalis. These species are placed following their use reports mentioned during data collection. In the category of general health care, 22 species are being used with 524 numbers of use-reports and medical importance of 23.82. The species indicated with the highest number of use-reports are Ocimum basilicum, Citrus aurantifolia, Curcuma longa, Ajuga parviflora, and Picrorhiza kurrooa based on user reports. The dermatological category ranks third with 21 taxa in use and a use-report value of 617 and medicinal importance of 29.82. The main species employed for this category based on the use reports are Setaria italica, Eupatorium adenophorum, and Artemisia martima. Although the hepatic health cure category comprised of only 8 taxa, it has a medicinal importance index value of 45.50, which is highest of all the categories since the species used under the category are of daily usage and are often included in daily food products with nutritive values. The species include Glycine max, Hordeum vulgare, Punica granatum, Urtica dioica, Polygonatum cirrhifolium, etc. In other works carried out in Uttarakhand, they have reported these medicinal plants and use different plant parts in a different ratio to cure disease or aliments [16, 30, 31, 41-43, 45, 47-49].  Leaf paste prepared from 100 g fresh leaf twigs applied on affected parts for early healing.
Ajuga parviflora Benth. Decoction prepared from 100 g fresh or dried roots with water given 3-5 TS orally in fever, stomach ache, and constipation for 5 days; this decoction taken orally in empty stomach regularly for stone; 1-2 leaves chewed on empty stomach for gastric problem; decoction of whole plant (5)(6)(7)(8) crushed with red chili (3) and 100 g Jiggery (Gur) given twice a day for 2-3 days to treat throat infection in domestic animals.
Allium sativum L. Paste prepared from 5-7 spilled bulb heated with 20 ml mustard oil, massage on joints.
Angelica glauca Edgew. Root powder (50 g) mixed with 100 ml water used to control vomiting and stomach ache; rhizomes are used as spices and condiments and tea (as flavor).
Artemisia martima L. Juice (5-10 ml) of fresh leaf applied on the affected area.
Asparagus racemosus Willd. Root decoction (100 g) prepared in water given to cure stomach ache (5 ml for adult, 1 TS for children) for 3-5 days, one palm full root powder taken with water as stimulant and tonic.
Berberis asiatica Roxb. ex DC Root powder (100-150 g) taken with warm water given twice a day for 3 days against fever; fresh or dried roots soaked in water overnight, filtered, and taken orally to cure diabetes in empty stomach.
Bergenia ciliata (Haw) Sternb. Fresh or dried roots (50-100 g) socked overnight and filtered, taken orally in morning for kidney stone. Root powder (50 g) taken with water twice a day for urinary infection.
Cannabis sativa L. Grinded seeds cooked with some local vegetables (e.g., Colacasia esculanta, Brassica oleracea) for warm effect; broiled seeds are grinded with salt and green chili to prepare salt (Pahadi namak). Broiled seeds grinded with Punica garnatum mixed with green leaves of coriandum, green chili, salt, and sugar to prepare Chatni; fresh leaves crushed with 3-5 seeds of black pepper and applied on insect bite.

Centella asiatica L.
Fresh leaf paste is applied on forehead.
Citrus aurantifolia (Christm) Sw. Juice extracted from fruit mixed with 1 TS honey, and 50 ml water taken orally in empty stomach for constipation and weigh loss; lemon tea used in fever and cold.
Citrus hystrix DC. Fruit juice given orally (1 TS) to children for removal of Ascaris; cough and cold 10 ml thrice a day; fruit juice with mentha leaves (100 g) and coriander seeds made into paste given to domestic animals against poison.
Curcuma longa L. Haldi powder (5 g) mixed with a full glass of warm milk for internal injury; paste of rhizome applied on cuts and wounds.
Fresh or dried root paste applied on the affected parts.
Decoction of 100 g root with water taken orally (10-15 ml) twice a day for excessive bleeding; root paste applied on wounds.
Dioscorea bulbifera L. Broiled fruit and cooked vegetable.
Duchesnea indica (Andrews) Focke Leaf paste is regularly applied on affected part.
Ficus palmata Forsk. Milky latex applied on cuts and wounds.
Ficus roxburghii Wall. Fresh fruits are cooked as vegetable.
Glycine max (L.) Merri Bhatt ka Jaula (an indigenous dish) is prepared from paste of seeds (soaked overnight) and cooked with rice in an iron vessel Kadahi.
Dried rhizome powder (2-3 g) taken with hot water once a day; paste of fresh rhizome used as anti-lice.
Hordium vulgare L. Sattu prepared from 200 g broiled seeds mixed with 100 g jaggery (Gur) and 100 g Ghee for warm and nutritive effect; 50 g broiled seeds heated with 40 ml mustard oil applied on burns.

Scientific name Mode of administration
Leucas lanata Benth Leaf juice with 3-5 drops of breast milk taken orally twice a day for 1 week.
Mentha arvensis L. Leaves (100 g) boiled with water and filter, the filtrate (50 ml) given orally twice a day.
Micromeria biflora Benth. Juice of whole plant with water (1-2 times in a day).
Gahat ka Ras (an indigenous dish) prepared by 150 g seeds cooked with water (1 l) until the volume reduced (100 ml) and taken regularly.
Momordica charanti L. Vegetable and juice (50 ml) of fresh fruit taken regularly.
Ocimum basilicum L. Decoction of 100 g leaves and seeds, zinger (50 g), 5 seeds black paper with 150 ml water taken orally 2-3 times a day for fever, cough, and cold; aerial part used to make herbal tea.
Origanum vulgare L. Decoction of 100 g fresh and dried leaves with water taken orally (10 ml) for a week in cough, cold, and fever; root paste applied on wounds.
Picrorhiza kurrooa Royle. Decoction of 50 g root with water taken orally against fever and abdominal pain for 5-7 days.
Plantago ovate Forsk. Seeds (10 g) soaked overnight or consumed directly with water twice a day for 30 days against constipation and digestive problems; Isabgoal (15 g) mixed with 10 TS fresh curd taken after meal for diarrhea.
Plantego lanceolata L. Paste of roots (100 g) given to domestic animals.
Podophyllum hexandrum Royle Root paste applied on wound.
Polygonatum cirrhifolium (Wall.) Royle Small pieces of tuber (8-10) soaked in water for overnight, taken in empty stomach for weakness, and develop immunity; cooked green leaves eaten as blood purifier; root paste applied on cuts and wounds.
Polygonatum verticillatum L. All Root powder (50 g) is taken with warm water in gastric complaints; fresh root paste applied for wound healing.
Prunus persica Stokes. Fresh leaf paste applied on head for 2-3 h.
Punica granatum L. Powder (50 g) of dried fruit peel taken orally with warm water for old cough; fruit juice (50 ml) given twice a day to anemic patient.
Ranunculus repens L. Root paste (50 g) applied for boils, and 30-50 ml filtered root extract (juice) is given twice a day against intestinal pain.
Rephanus sativus L. Vegetable prepared from fresh leaves and root as salad.
Rheum emodi Wall. Decoction of 100 g root with warm water taken orally (10 ml) for fever twice a day; root paste applied on wounds.

Rhododendron arboreum Smth Juice extracted from fresh flowers
Rosa moschata Hermm. Fresh leaf paste is applied on cuts, wounds, and boils; water extracted from fresh flowers used in eye diseases.

Rubia cordifolia L.
Root decoction with water given orally (1-2 TS) against fever twice a day to children (5 months-10 years) Rubus ellipticus Smith. Decoction (10 ml) of 100 g roots with water taken orally against fever and stomach ache for 5 days.
Saussurea costus (Falc.) Lipsch Decoction of root (50 g) with water given against dysentery for 3-5 days twice a day; root powder (50 g) taken orally with boiled water in fever, cough, and stomach ache.

Setaria italica L.
Koni ka Jaula (an indigenous dish) prepared from seeds cooked with water.
Silene vulgaris (Moench) Garcke Root decoction (10 ml) with warm water given against fever for 3 days; 1 TS is used for removal of Ascaris (Juga); leaves are used as a vegetable.
Swertia spp. Juice of fresh leaves (100 g) given with boiled water 3 TS for 3-5 days for fever; Panchang (whole plant) is used after soaking overnight and taken (50-100 ml) orally in empty stomach for 15 days.
Taraxacum officinale Weber. For snake bite: juice of whole plant with water taken orally (1-2 TS) thrice a day and applied on injured part for 1 week; mixture of 100 g roots with 9 seeds of black pepper, 1-2 l processed curd (Mattha), and 250 g paste of black soybean given to increase lactation in milching animals.
Tegetus erecta L. Fresh leaf juice with water taken against fever (3-5 TS twice a day); leaf extract (2-3 drops) in ear infection; fresh leaf paste is applied for healing cuts and wounds.
Terminalia chebula (Gaertner) Retz. Dried fruit powder (100 g) given orally with boiled water twice a day for 3-5 days in stomach ache; dried fruit crushed with water and given (1-2 ml) orally to children (3 months to 5 years) and small amount applied around the navel.
Thalictrum foliosum DC. Fresh roots (50 g) soaked in rose water (100 ml) for overnight, filtered, and used as eye drop.
Thymus serpyllum L. Paste of whole plant mixed with mustard oil gently applied on joints; whole plants juice (10 ml) mixed with honey (20 g) is taken orally for cough and asthma; broiled seeds (10-15 g) with warm water taken for digestive and stomach problems; leaves and seeds are used as spices and condiment.
A correlation analysis was done among RFC, CI, UR, number of species used in treating different ailments, informant consensus factor (Fic), and medical importance. No evidence of any correlation was observed in most of the parameters; a highly positive correlation was only observed in the number of taxa used and the number of use reports (0.963). Also, there has been a moderately positive correlation observed between Fic and RFC which is of no significance in the study as both the parameters have been described differently.
Some species are also used in ethnoveterinary purposes for curing domestic animals. Ajuga parviflora is used to cure throat infection, Coriandrum sativum against poison, and Taraxacum officinale, Verbascum thapsus, and Viola canescens to increase lactation in milking animals.

The weakening of traditional ethnobotanical knowledge
It is alarming to note that there has been a continued decline in traditional ethnobotanical knowledge in the target area (Fig. 7). An analysis of community perception on change in use pattern of medicinal plants in 2018 and a decade earlier (i.e., 2008) revealed that there is less number of species used for curing different ailments in recent years (Table 5). People are moving away from traditional herbal cure system, and the young generation has no interest in the traditional customs and values. Earlier, the people of remote areas preferred to consult with Vaidyas for primary healthcare, but in the last decade, since there is an increase in accessibility, availability, and affordability towards the allopathic medicinal system, the local community is also opting for such options. Despite that 57% of the total respondents believe that these plants are highly effective, 30% found moderately effective, while only 13% feel it less effective Trigonella foemun-graecum L. Leaf juice is taken orally for curing obesity, indigestion, joints pain, and constipation; 25 g seeds are soaked overnight filter; the filtrate taken orally in empty stomach for gastric problems and diabetes.
Urtica dioica L. Branches with leaves are gently rubbed on joints and muscles; fresh leaf twigs taken as vegetable; fine powder of dry leaf (5-10 g) dissolve in 50 ml water is taken orally in joints and muscular pain.
Verbascum thapsus L. Fresh leaf paste applied on affected part for boils; 8-10 whole plants mixed with grass given mulching animals.
Viola canescens Wall. Ex Roxb Fresh plants  given with grass for 1 to 2 weeks.
Vigna mungo L. Paste prepared by grinding of 150 g seeds with water applied on the fractured part.
Zanthoxylum armatum DC Seeds (100 g) boiled with water taken orally twice a day; seed bark used as a spices.
Zingiber officinale Rosc. A piece (5-10 g) of broiled rhizome mixed with small amount of honey and chewed.

Conclusions
Community knowledge on the use and management of wild plant resources has always been integral to the survival, sustenance, and adaptation of human cultures [47,53,58]. This study revealed 70 medicinal plant species being used by the local marginal community of which 21 are the most extensively used species to treat various ailments. The significance of the traditional herbal healing system is highly relevant due to its effectiveness. It is cost-effective and based on local resources and still only means of cure for marginal communities in remote localities of Uttarakhand. With population growth and lack of health care, there is a need to adhere to the locally available resources to be utilized for general health care and provisioning of suitable side-effect free treatment to the communities. The community still uses these species; however, the level of use is decreasing because of upcoming modern allopathic based health care services. At the same time, there is also a decline in the number of local Vaidyas and herbal practitioners. This is because of increased access to modern hospitals and medicinal facilities in recent times.   Fever and vomiting Fever, vomiting, and cough [21,28,51,58] Acorus calamus L. *Inflammation and insect repellent Arthritis, cancer, convulsions, diarrhea Sprain Dyspepsia, epilepsy [41,43]; sprain [50] Ageratina adenophora (Spreng.) Cuts and wounds Cuts and wounds [31,41] Ajuga bracteosa Wall. ex Benth.
Diabetes, purgative and laxative, carminative, stomach ache, and source of vitamin "C" Asthma, digestive disorders, hair fall [31]; dysentery, cholera, and jaundice [41,51] Euphorbia prolifera Ehrenb. ex Boiss *Insect repellent --Ficus palmata Forsk. *Cuts and wounds Lungs diseases, skin diseases [43,49,51] Ficus roxburghii Wall. *Acidity, source of vitamin "C" Laxative [49] Glycine max (L.) Merri *Jaundice --This possesses a significant challenge to the continuity of the traditional herbal cure system. The impoverishment of such knowledge may lead to an enormous loss to the scientific community. The ethnomedicinal knowledge and information provided in this study are of significant value for scientific validation, product development, conservation, and policy planners for sustainable management of medicinal plants and traditional herbal cure system. It is suggested to explore and establish linkage between traditional health practices and modern health care systems. It can be done by testing bioactive compound and biological activity of most preferred plant species and assessing the safety and efficacy of the local herbal formulation. Such an investigation may lead to many new and novel drug discovery. It is also recommended that Table 5 Similarity between present and past ethnomedicinal uses of important species (Continued) the natural habitats of medicinal plants should be protected for the conservation of valuable gene pool and to control the exploitation of species. Since ethnomedicinal information is strongly linked to local livelihoods, culture, and environment, it is strongly recommended to further continue studying the subject to serve humanity with healthier and operative health care measures.