Ethnobotany of the Monpa ethnic group at Arunachal Pradesh, India
© Namsa et al; licensee BioMed Central Ltd. 2011
Received: 21 September 2010
Accepted: 14 October 2011
Published: 14 October 2011
The present paper documents the uses of plants in traditional herbal medicine for human and veterinary ailments, and those used for dietary supplements, religious purpose, local beverage, and plants used to poison fish and wild animals. Traditional botanical medicine is the primary mode of healthcare for most of the rural population in Arunachal Pradesh.
Materials and methods
Field research was conducted between April 2006 and March 2009 with randomly selected 124 key informants using semi-structured questionnaire. The data obtained was analyzed through informant consensus factor (FIC) to determine the homogeneity of informant's knowledge on medicinal plants.
We documented 50 plants species belonging to 29 families used for treating 22 human and 4 veterinary ailments. Of the medicinal plants reported, the most common growth form was herbs (40%) followed by shrubs, trees, and climbers. Leaves were most frequently used plant parts. The consensus analysis revealed that the dermatological ailments have the highest FIC (0.56) and the gastro-intestinal diseases have FIC (0.43). FIC values indicated that there was high agreement in the use of plants in dermatological and gastro-intestinal ailments category among the users. Gymnocladus assamicus is a critically rare and endangered species used as disinfectant for cleaning wounds and parasites like leeches and lice on livestocks. Two plant species (Illicium griffithii and Rubia cordifolia) are commonly used for traditional dyeing of clothes and food items. Some of the edible plants recorded in this study were known for their treatment against high blood pressure (Clerodendron colebrookianum), diabetes mellitus (Momordica charantia), and intestinal parasitic worms like round and tape worms (Lindera neesiana, Solanum etiopicum, and Solanum indicum). The Monpas of Arunachal Pradesh have traditionally been using Daphne papyracea for preparing hand-made paper for painting and writing religious scripts in Buddhist monasteries. Three plant species (Derris scandens, Aesculus assamica, and Polygonum hydropiper) were frequently used to poison fish during the month of June-July every year and the underground tuber of Aconitum ferrox is widely used in arrow poisoning to kill ferocious animals like bear, wild pigs, gaur and deer. The most frequently cited plant species; Buddleja asiatica and Hedyotis scandens were used as common growth supplements during the preparation of fermentation starter cultures.
The traditional pharmacopoeia of the Monpa ethnic group incorporates a myriad of diverse botanical flora. Traditional knowledge of the remedies is passed down through oral traditions without any written document. This traditional knowledge is however, currently threatened mainly due to acculturation and deforestation due to continuing traditional shifting cultivation. This study reveals that the rural populations in Arunachal Pradesh have a rich knowledge of forest-based natural resources and consumption of wild edible plants is still an integral part of their socio-cultural life. Findings of this documentation study can be used as an ethnopharmacological basis for selecting plants for future phytochemical and pharmaceutical studies.
KeywordsKalaktang Monpa Ethnobotany Medicinal plants Arunachal Pradesh
Medicinal plants have been used as sources of medicine in many indigenous communities throughout the world. According to WHO, herbal medicines serve the health needs of about 80% of the world's population, especially for millions of people in the rural areas of developing countries . India has a rich source of medicinal plants distributed in different geographical conditions and the large sections of Indian population still rely on traditional plant medicines as they are abundantly available, economical, and have little or no side-effects in addition to their cultural acceptability [2–4]. The plant-based knowledge, largely oral, has been transferred from one generation to the next through traditional healers, knowledgeable elders or ordinary people without any written documents. We found that the indigenous knowledge on plant resources was confined to elder members of the study area and the younger's have little or no contribution in this aspect. The study of ethno-botanical plants provides an opportunity for multi-disciplinary and interdisciplinary research work between botany, pharmacology and toxicology, chemistry, anthropology and sociology. The total population of the Arunachal spreading over 16 districts is about 1,019,177 (Population census, 2001), is home to about 28 major tribes and 110 sub-tribes . Each district has its own composition of tribes with distinctive dialects, custom, traditional beliefs and cultural diversity. Medicinal plants have been used as sources of traditional medicine in virtually all tribal cultures and today, according to World Health Organization as many as 80% of the world's population depend on traditional medicine for their primary healthcare needs. In Arunachal, about 5000 species of angiosperms has been recorded and over 500 species of plants are used in the traditional healthcare system to treat various ailments . Herbal plants use for the preparation of Ayurvedic, Unani, Sidha and homoeopathic medicines are available in different climatic zones of the state . In addition to tribal medicines, plants and their parts are commonly used as food supplements, dying clothes, veterinary health care, handicrafts, rituals, local beverage (beer) production, seasonal fishing, and hunting [8–11]. The existence and dependency on a large number of traditional practices can be thought of as an alternative type of medicine, where the cost and side effects are negligible. Doley et al  reported a unique medicinal plant uses among the Nyishi community of Arunachal Pradesh. The consumption of wild edible plants are used as supplements to cultivated crops and as a survival strategy during food shortages that appears to have been intensified due to low development of agricultural production. Tag and Das  documented the ethnobotanical importance of 28 plants species, which are particularly used as food, medicine, in rituals and other ethnobotanical importance of the Hills Miri tribe of Arunachal Pradesh. Deb et al  while studying the Nyishi ethnic community of Arunachal Pradesh reported that a large number of traditional crops grown in agro-forestry are valuable for the farmers' everyday life, as they provide a greater diversity of food and also act as a good source of commercial outlets in addition to household consumption. They also reported the importance of plant species like bamboo, Areca catechu and Livistonia jenkinsiana that are useful for fencing, craft making, house construction and valued for traditional worship as they are associated with ancestral sacrifices. Goswami et al  reported a total of 10 medicinal plants used by the Tagin tribe of Arunachal Pradesh for the treatment of common illness as well as for ethno-veterinary use. Utilization of this traditional knowledge of medicinal plants is not only useful for conservation of cultural traditions and biodiversity but also for community healthcare and drug development. Srivastava et al  reported a total of 106 plants species used in food, medicine, hunting, cultural and handicrafts by the Apatani tribe. Kagyung et al  reported a total of 44 plant species used by Adi tribe of Arunachal Pradesh for the treatment of various gastro-intestinal diseases. Sen et al  documented the traditional herbal knowledge of Khampti tribe of Arunachal and found the highest number of species used for treatment of lung related diseases. Sarmah et al  reported a total of 63 medicinal plant species used by Chakma community of Arunachal Pradesh for the treatment of common diseases such as diarrhea, malaria, cough, dysentery, and gastro-intestinal disorders. Dutta and Bhattacharjya  have studied an indigenous community fishing practiced by the Wancho tribe of Tirap district, Arunachal Pradesh.
Although the rich indigenous knowledge on the medicinal use of plants has been relatively well documented in other ethnic groups of Arunachal Pradesh [12–21], studies on the knowledge of medicinal and wild edible plants of Kalaktang Monpa are limited. In previous study, we reported that the Lohit community of Arunachal Pradesh have a rich knowledge on herbal remedies for treating inflammation-related diseases  and different tribes inhabiting in the state has a rich reservoir of traditional knowledge on natural resources.. The most serious threat to the existing knowledge and practice on traditional medicinal plants included cultural change, particularly the influence of modernization, lack of written document, deforestation, environmental degradation, and lack of interests shown by the next younger generations were the main problems reported by the informants during the field survey. Urgent ethno-botanical studies and subsequent conservation measures are required to prevent the loss of valuable indigenous knowledge of medicinal plants of several indigenous communities in Arunachal Pradesh. In the absence of modern rural link road and the lack of infrastructure in sub-health center in each villages covered in this study, the tribal communities primarily rely on plant-based remedies to meet their basic healthcare needs. Therefore, the assessment and documentation of ancestral knowledge of indigenous people on traditional plant medicines would fill the gap associated knowledge between the elders and the younger generation on medicinal plants. The purpose of this ethno-botanical study was to present the results of ethno-botanical field survey conducted between April 2006 and March 2009, which was analyzed with two different quantitative ethno-botanical tools to select the important species used in traditional medicine and the homogeneity of indigenous knowledge amongst Monpa ethnic group of Kalaktang, Arunachal Pradesh, India.
Materials and methods
Study area: Kalaktang
Ethnology and cultural background: Monpa tribe
The west kameng district is inhabited by five different tribes such as the Akas, Khowas, Mijis, Sherdukpens, and Monpa. The entire population of the west kameng district can be divided into two cultural groups on the basis of their socio-religious affinities, of which the Monpas and Sherdukpens follow the lamaistic tradition of Mahayana Buddhism. The second groups of the people are Akas, Mijis, and Buguns, who worship the Sun and the Moon as God, locally called as "Donyi-Polo" and "Abo-Tani", respectively. Due to slight variations in dialects, Monpa can be divided into six linguistic groups, namely Tawang Monpa, Dirang Monpa, Lish Monpa, Boot Monpa, Panchen Monpa, and Kalaktang Monpa. The Monpa have castes and clans with no social hierarchy. Monogamy (follow strictly endogamy) is a general rules though polygamy is also practiced in the present generation. The Monpa belongs to the Tibeto-Mongoloid racial stock and their houses are built of stones and timber decorated with a small altars and chapels with statues of Lord Buddha. Offering water in seven little cups and burning butter lamps and some leaves of herbal species (Pinus wallichiana A.B. Jackson, Pinus longifolia Roxb. and Thuja occidentalis L.) are daily rituals. They believe in transmigration of soul and reincarnation. The Monpas perform many pantomime dances of which "Achilamu", a group of five member dance is the most unique and popular form of dance perform throughout the day to complete the process in special occasions. Festival forms essential aspects of socio-religious life of the Monpas. Lossar and Choskar are the major religious festival of Monpa celebrated once in a year. Lossar, usually celebrated in the month of March before the start of agriculture is the local new year of the Monpa community. In Choskar festival (celebrated after sowing crops like maize, paddy, etc), the lamas or Monks read religious scriptures in the Gonpa (monastery) for a number of days (3-4 days). Thereafter, the villager's particularly female folk (both married and unmarried) carry the religious books on their back in the procession under the guidance of senior most Monk and the procession (1 day) covers throughout the cultivation fields. The significance of this performance is to ensure bumper harvest and crop/grains protection from insects and wild animals and for overall prosperity of the village people. The Monpas are agriculturist, practice both shifting and permanent types of cultivation. The commonly grown field crops include maize, paddy, beans, bajra, millets, barley, wheat, mustard, cabbage, potato, cauliflower, and pumpkin, etc. Livestock's like yaks, cows, pigs, sheep, seasonal fishing, and hunting of wild animals are the primary source of income. The Monpas are well known for wood curving, painting religious scrolls called Thankas, carpet and paper making, and weaving.
Ethno-botanical survey and consensus analysis
A total of 27 field visits (8-10 days in each survey) were conducted amongst Monpa community during the study period from April 2006 and March 2009 to document an indigenous traditional knowledge on medicinal plants. Male and female respondents with age ranging from 20-60 years were included during interview. All collections were made by the first author (NDN) who grew up and belonged to Monpa community of Kalaktang and was familiar with the local language and some of the traditional plants used by the local people of the region. The ethno- botanical information was collected using semi-structured questionnaires [21, 22] to address the following objectives:
1. Document the medicinal plants used in the traditional healthcare system of Kalaktang study area-parts used and method of preparation,
2. The informant consensus factor (FIC) was calculated in order to estimate use variability of medicinal plants,
3. Reliability of medicinal plant was assessed by comparing indigenous plant use with online literature reports on phytochemical and pharmacological properties,
4. How is the traditional knowledge of indigenous people preserved, utilized and transmitted to next generation?
Ethnobotanical consensus index for traditional medicinal plant use categories
Illness category (diseases and disorders)
Number of Taxa (Nt)
Number of use-reports (Nur)
Informants' consensus index factor (FIC)a
Dermatological disorder (Scabies, skin diseases, pimples, eczema, inflammations, wound healing, cuts)
Gastro-intestinal disorder (Gastritis, diarrhea, dysentery, stomach ache, intestinal worms, and throat clearance)
General Health (Tooth ache, bone fracture, heart problem, cough, diabetes, high blood pressure, and jaundice)
Miscellaneous (Poison, veterinary diseases, beverages, rituals and religious, fodder, condiments, and soap)
Results and discussion
Medicinal plants, growth forms and plant parts
Ethno-botanical uses of plants documented in the study area: Kalaktang, Arunachal Pradesh
Botanical name/Voucher number
Local name/Status of domestication
Artemisia nilagirica (Clarke) Pamp. (N/2005-20)
Juice and paste (E)
Wounds, cuts, scabies, and inflammations
Ageratum conyzoides Linn. (N/2005-21)
Juice and paste (E)
Wound healer, Veterinary, fish poison
Azadirachta indica A. Juss (N/2006-2001)
Stomach disorder, diarrhoea
Allium sativum Linn. (N/2006-200)
Leaves and rhizome
Paste and juice (E)
Allium hookeri Linn. (N/2005-22)
Leaves and rhizome
Paste and juice (E)
Skin diseases, Veterinary, bone fracture,
Aesculus assamica Griffith (N/2005-40)
Fresh barks collected and pounded with wooden stick
Aconitum ferox Wall. (N/2005-46)
Paste in arrow (made of iron) poisoning
Poison to kill rats and wild animals
Bidens pilosa Linn. (N/2006-222)
Decoction and paste (E)
Wounds and skin inflammations
Buddleja asiatica Lour. (N/2006-223)
Leaves and young twigs
Juice and paste (E)
Diarrhoea, Beverages fermentation
Cannabis sativa Linn. (N/2005-19)
Leaves and seeds
Mixed with maize flour
Castanopsis indica Roxb (N/2005-38)
Leaves and stem bark
Whole plant extract is used to poison fish
Fish poison and raw seeds are eaten
Curcuma caesia Roxb. (N/2005-28)
Rituals and pimples removal
Centella asiatica Linn. (N/2006-224)
Decoction (I), vegetable
Stomach disorder, cuts, wounds, inflammations& common vegetable
Clerodendrum colebrookianum Walp. (N/2005-24)
Decoction with sugar (I), boiled vegetable
High blood pressure, stomach disorder, headache
Citrus indica Tanaka (N/2005-25)
Face pimples removal
Dioscorea alata Linn. (N/2005-23)
Derris scandens (Roxb.) Benth. (N/2005-32)
Roots are pounded with wooded stick and thrown into the river to poison fishes
Ficus glomerata Roxb. (N/2005-30)
Diabetes and common fodder
Gynura crepedioides (BTH.) Moore (N/2006-225)
Leaves and young twigs
Vegetables and stomach disorder
Gymnocladus assamicus Kanjilal ex. P.C. Kanjilal (N/2005-17)
Detergent (soap), religious and veterinary
Hedyotis scandens Roxb. (N/2006-228)
Leaves and young twigs
Decoction with sugar (I)
Gastritis, Beverages fermentation
Houttuynia cordata Thunb. (N/2006-229)
Decoction (I)/boiled vegetable/raw
Stomachache and diarrhoea
Ipomoea batatas Linn. (Lam.) (N/2005-35)
Leaves and tuber
Rituals, tubers staple food and leaves as fish feeds
Leucas aspera Spreng. (N/2006-230)
Juice and paste (E)
Cuts and wounds, earache, inflammation
Litsea cubeba (Lour) Pers. (N/2005-38)
Paste (E), Raw/cooking
Condiments, eczema, heart disease and stomach disorder
Lindera neesiana (Wallich ex Nees) Kurz (N/2005-39)
Hot oils taken 2-3 spoonful (I)
Anthelmintic, diarrhoea, scabies, vegetable oils
Momordica charantia Linn. (N/2006-236)
Mannihot esculenta Crantz (N/2006-238)
Oroxylum indicum Vent. (N/2006-240)
Seeds collected and dried
Ocimum sanctum Linn. (N/2006-244)
Paste (E), hot water decoction (I)
Stomach disorder, inflammations, wounds, cuts
Pinus wallichiana A.B. Jackson (N/2005-16)
Leaves and cones
Rituals and resins
Pinus longifolia Roxb (N/2005-15)
Piper betle Linn. (N/2005-14)
Polygonum hydropiper Linn. (N/2005-36)
Whole plant extract
Psidium guajava Linn. (N/2006-252)
Raw/decoction with citrus fruit juice and salt (I)
Punica granatum Linn. (N/2005-37)
Stomach ache and diarrhoea
Pouzolzia bennettiana Wight (N/2005-52)
Plantago major Linn. (N/2005-42)
Paste and juice (E)
Wounds, inflammations, Veterinary
Rhododendron arboreum Smith. Gurans (N/2005-49)
Decoction with sugar (I)
Dysentery, diarrhoea, throat clearance when fish bones get stuck in the gullet
Solanum xanthocarpum Burm. f. (N/2005-44)
Solanum indicum Linn. (N/2005-54)
Anthelmintic, Beverages fermentation
Solanum torvum Sw. (N/2005-50)
Borang Kharangjeh, Wild
Solanum sp. (N/2005-13)
Saccharum officinarum Linn. (N/2006-243)
Spilanthes oleracea Murr. (N/2006-246)
Leaves and young twigs
Paste (E)/boiled vegetable
Stop bleeding, skin infections and gastritis, fish poison
Thysanolaena maxima Kuntze (N/2006-250)
Whole plant collected and dried
Thuja occidentalis Linn. (N/2005-12)
Zingiber officinale Rosc. (N/2005-48)
Cough and Stomachache
Consensus of traditional knowledge
Fidelity Level (FL) of interesting medicinal plants of the study area
Fidelity level (FL) (%)
Published related ethno-pharmacological references
Wound healing, scabies
Antifungal activity 
Stomach disorder, diarrhea
Antibacterial and antidiarrhoeal activity
Anti-inflammatory activity 
Diarrhea in cattle
High blood pressure
Essential oil 
Stomach disorder, wounds
Wound healing activity; Gastro-protective; Flavanoids 
Intestinal worms, diabetes
Diarrhea, throat clearance
Quercetin, rutin, coumaric acid 
Wounds, inflammations, ethnoveterinary
Cough and throat clearance
Freshly cuts and wounds
Stomach ache, diarrhea
Comparison of indigenous plant use with available pharmacological reports
Comparison of indigenous plant use and pharmacological properties of reported medicinal plants
Reported phytochemical/pharmacological properties
Local use coherent with known phytochemical/pharmacological properties
Wounds, scabies, inflammations
Anti-inflammatory in experimental rats .
Anti-inflammatory, anti-allergic activity (Horiuchi and Seyama, 2008; Inflammations, bacterial infections .
Stomach disorder, wounds
High blood pressure
No relevant report found
Hypoglycemic activity in alloxan-induced diabetic rats .
No relevant report found
No relevant report found
Eczema, stomach disorder
Fungicidal terpenoids and essential oil .
Essential oil and antimicrobial activity .
Anti-diabetic activity .
Stomachache, inflammations, wounds
Anti-diarrhoea activity .
Stomach ache, diarrhoea
Antidiarrhoeal and anti-inflammatory activity .
No relevant report found
Anti-inflammatory, wound healing, anti-microbial, anti-tumor .
No relevant report found
Cytotoxic and novel compounds .
Anthelmintic activity of botanical extracts .
Sugar cane contains phenolic acids, flavonoids and other phenolic compounds .
Stop bleeding, gastritis
No relevant report found
Antibacterial activity .
Traditional knowledge secrecy and method of crude herbal medicine preparation
A total of 50 plant species belonging to 29 families and 39 genera were reportedly used by the Monpa ethnic group in their daily life. One hundred twenty-four informants (91 male and 33 female individuals) were interviewed in the study area with their age ranged between 20-60 years. Large number of informants reported that most ailments were treated at a household level. On average, significantly higher numbers of medicinal plants were claimed by illiterate village men than women (91 (73.4%) men; 33 (26.6%) women; aged between 40 and 60 years). Ethno-pharmacological survey work in India also indicated that information on the medicinal uses of plants was being confined mostly to elderly people (above 40 years of age) [46, 47]. Literate people in the study area reported less number of medicinal plants as compared to illiterate ones which could probably be due to higher influence of modernization on the former. This observation holds true for related studies conducted throughout the world [48–50]. However, a study conducted by the Fassil  in the Northwestern Ethiopia, revealed that there was no significant difference in medicinal plant knowledge between men and women. Twenty-one male respondents (aged between 48-60 years) constitute knowledgeable, whose tradition of healing practices are revered and trusted in the local community and play multiple roles as spiritual guides and healers. Many ailments have been diagnosed and treated at household or family level and the fact that most treatments are given at household level was also reflected in the findings of other works [52–56]. There was high agreement among informants that transfer of knowledge to people outside the family circle took place on substantial payment. Most informants reported that knowledge was formally transferred along the family line and mainly through sons [57–62]. Remedy preparations often involved some sort of spiritual or ritual procedures. Ethno-pharmacological survey work conducted elsewhere demonstrated similar results [[13, 45], and ]. This is also evident from Ethiopia where parents prefer to pass their traditional medical knowledge secrecy more to sons than to daughters . Nearly 90% of informants reported that vertical transfer of medicinal plant knowledge was not taking place effectively due to lack of interest by the younger generation to learn and practice it mainly due to acculturation. It was also revealed that some informants ceased to practice traditional medicine due to the increasing availability of allopathic medicines. Informants in the study area confirmed that, medicinal plants are generally collected from different habitats. The method of preparation was mostly a hot water decoction in case of plants being administered orally and usually prepared from freshly collected plant material just before use. Studies conducted elsewhere [40, 47] also revealed the frequent use of fresh materials. Fresh materials are also preferred to dried ones when they contain volatile oils, the concentration of which could deteriorate on drying. The majority of remedies were administered topically or external (16 species) or hot water decoction or oral administration (9 species), boiled vegetable (12 species), and eaten raw (9 species, see Table 2). Remedies were mostly processed using locally made mortar and pestle or grinders. Plant material used for preparation of herbal remedies was difficult to quantify but was indicated approximately 40-50 g fresh plant material or 20-25 g of powdered plant material in 300 ml of hot water to be taken twice daily after meal. Doses were mainly taken twice a day because most people were present at home on the morning and evening. The dosage depends on the age and physical appearance of the individual whilst children's were given less than adults which approximate to 100-150 ml twice daily depending on the type of illness and treatment. There were no reports of side effects following administration of herbal remedies as informed by the treated patients in particular and the local practitioners. Treatment was supposed to be continued until recovery. When patients did not show any sign of improvement after the completion of treatments with herbal remedies, they were taken to a nearby modern health centers for further examination by the physician. The ethno-botanical knowledge of Monpa ethnic group gathered in this study has been categorized and described briefly in the following sub-headings.
Edible plants used as vegetables
The Monpa community derives common vegetables either alone or in combination from underexploited plant species like Alocasia indica (Roxb.), Dioscorea alata L., Ipomoea batatas (leaves and tuber) L., Mannihot esculentum Crantz, Momordica charantia L., Phaseolus vulgaris L., Pouzolzia bennettiana Wight, Diplazium esculentum (Retz.) Sw., Centella asiatica L., Houttuynia cordata Thunb. (green salad), Gynura crepedioides (BTH.) Moore (green salad), Spilanthus oleraceae Murr., Litsea cubeba (Lour) Pers. (spice), Clerodendron viscosum Vent., Solanum indicum L. (green salad), Solanum torvum Sw. (Green salad), Solanum etiopicum, Allium sativum Linn., and Allium hooleri L. (green salad). These plant species are generally sold in the local market at reasonable price. The tender shoots of selected bamboo species like Dendrocalamus hamiltonii Hook. f. collected in bulk was prepared by cutting it into strips or pieces and boiled. The boiled shoots are chopped finely and packed in jars, bamboo tubes (Chunga) or even in plastic buckets and was kept for 5-10 days for fermentation. After fermentation, the taste of chopped shoots becomes sour. Fresh bamboo shoots and its fermented products were sold in the local market as edible foodstuffs. Important domestic uses concerned presently cultivated species of Livistona jenkensiana Griff. used for thatching and Bambusa tulda Roxb. and B. pallida Munro., for house building work. Traditional dyeing of clothes and food items were derived from plant species namely Illicium griffithii Hook. and Rubia cordifolia L. These plant species are currently cultivated in the gardens to meet regular use due to their less accessibility. Some of the plant parts used as a food source was also ingested as a remedy: Clerodendron colebrookianum (blood pressure), Momordica charantia (diabetes mellitus), Lindera neesiana, Solanum etiopicum, and Solanum indicum (intestinal parasitic worms like round and tape worms
Religious or ritual plants
The Monpa community in the eastern Himalayan province of Arunachal Pradesh follow Mahayana sect of Buddhism and are famous for hand-made paper for writing religious scripts in Monasteries (locally called "Gonpa") from stem bark of Daphne papyracea (Thymelaeaceae) Wall. Flowering twigs of Thysanolaena maxima has traditionally been used for broom making and to support the cotton wick to offer daily butter lighting in monastery. However, under the influence of modern society, today D. papyracea was not being used for making paper for writing Buddhist scripts as revealed during field survey work. Gymnocladus assamicus ripe pods are soaked in water and used to rubbed palms when preparing torma, a kind of sweet made of rice flour offered to the Lord Buddha during various festival ceremonies at Monasteries. The Monpa houses are built of stones and timber decorated with a small altars and chapels with statues of Lord Buddha. Offering water in little seven cups and burning butter lamps and herbal incense sticks with few herbal leaves (Pinus wallichiana A.B. Jackson, Pinus longifolia Roxb. and Thuja occidentalis L.) (Cupressaceae) are daily rituals. These plant species are cultivated within the premises of monasteries for their use during religious festival called Choskar. It was of common belief that burning of such herbal leaf create clean and refreshing atmosphere inside the Gonpa. The heart wood of pine tree was used for lighting of the street at night and ignition of firewood at home in olden days where there was no supply of electricity and kerosene. The resins extracted from pine wood are used as adhesives. Bulbs of Allium sativum and Allium hookeri are used in rituals and to protect against the evil spirit. A leaf of banana has long been used during festival ceremony in monastery to offer foodstuffs to local participants. The rhizomes of Zingiber officinale and Mannihot esculentum remains an integral component of daily rituals among the Monpas religious life.
Local beverage (local beer) plants
The traditional consumption of a variety of alcoholic beverages since time immemorial is still an integral part of different ethnic communities in the north-eastern region of India. Popular traditional beer, locally known as "bhangchang", was prepared from rice (Oryza sativa L.), finger millet (Eleusine coracana Geartn.), maize (Zea mays L.) and buckwheat (Fagopyrum esculentum Moench). "Bhangchang" has traditionally been used and served in all festive occasions, birth and marriage ceremonies. A diverse knowledge system exists among the Monpa women to prepare the nutritionally rich foods and fermented beverages, which play an important role in their day to day socio-cultural and spiritual occasions. A Monpa woman uses some of the wild plants as anti-microbial and they believed that these plants are responsible for the healthy growth of yeast during the process of fermentations. During the field study, we have documented the use of young leaves and twigs of certain species like Piper betle, Solanum indicum, Buddleja asiatica and Hedyotis scandens as common growth supplements during the preparation of fermentation starter cultures containing brewer's yeast (locally called phamzas). The most frequently cited species were Buddleja asiatica and Hedyotis scandens. They believed that consumption of rice beer is good for health and act as a remedy for various ailments may be attributed to medicinal properties of the herbs used in the preparation of starter cultures.
A few plants were used to improve the health state and growth of livestocks. The leaves of Cannabis sativa was given to the cattle and goat to cure dysentery and diarrhoea (These diseases were identified by the presence of watery stool and blood). The stem of wild Musa paradisica L., was regularly given to cattle particularly during pregnancy to enhance the yield of milk. A paste powder obtained from the whole plant of Plantago major and Ageratum conyzoides are commonly tied to the affected portions of cattle and goat to relieve from severe pain and inflammations. Gymnocladus assamicus ripe pods are soaked in water and used as disinfectant for cleaning wounds and parasites like leeches and lice on the skin of livestocks. The fully ripe pods soaked in water are used as soap for bathing because it does not cause harm to soft skin and burning sensation to eyes. Leaves are used as green manure in agricultural field crops. Gymnocladus assamicus is a critically rare and endangered plant species and also endemic to the north-eastern region of India .
Ichthyotoxic and fish feed plants
Community seasonal fishing and hunting are of great economic activities of many tribal people including Monpa ethnic group in addition to agriculture. The study revealed a wealth of indigenous knowledge and procedures related to poison fishing with the aid of poisonous plants. This easy and simple method of fishing are forbidden in urban areas but still practiced in remote tribal areas. The active ingredients were released by macerating the appropriated plant parts with the help of wooden stick or hammer, which were then introduced into the water environment. Depending upon time and conditions, the fish begin to float to the surface where they can easily be collected with bare hand. A total of seven plant species, namely Castanopsis indica, Derris scandens, Aesculus assamica, Polygonum hydropiper, Spilanthes acmella, Ageratum conyzoides, and Cyclosorus extensus were used to poison fish during the month of June-July every year and leaves of three species like Ipomoea batatas, Mannihot esculenta, and Zea mays were used as common fish foodstuffs. The two main molecular groups of fish poisons in plants (the rotenones and the saponins) as well as a third group of plants which liberate cyanide in the water account for nearly all varieties of fish poisons . The underground tuber of Aconitum ferrox was widely used in arrow poisoning to kill ferocious animals like bear, wild pigs, gaur and deer. The killing of Himalayan bear was very common practice among the tribal people and the gall bladders are highly priced in the local market. The dried gall bladders of bear are given orally in low doses to cure malaria since ancestral times.
This ethno-botanical survey results probably revealed the rich wealth of indigenous knowledge and usage custom of traditional plants associated with rural people of Arunachal Pradesh. Despite their use in traditional medicines, plant species documented in the present field work have been extensively used for improving the health of livestock, fish foodstuffs, ethno-fishing technology, local fermentation technologies, religious and food plants as well. There was no written document of traditional healing knowledge and transmission to the future generation take place only through oral communication. The immediate and serious threat to the local medical practice in the study area seems to have come from the increasing influence of modernization, deforestation due to anthropogenic activities and migration of the younger generations to urban areas leaving a gap in the cultural beliefs and practices of indigenous society. However, there was a potential threat to the medicinal flora of the area as a result of the increasing trend of shifting cultivation (annual clearing of forest) and cultural changes signaling the need for serious efforts to create public awareness so that the appropriate measures are taken to conserve the suitable environments required to protect the medicinal plants in the natural ecosystems. More detailed ethnopharmacological investigations need to be conducted in this area particularly in regard to conservation strategies and sustainable use of medicinal plants.
We are grateful to study participants and traditional healers of Monpa ethnic group for sharing their valuable indigenous knowledge on botanical plants during the ethno-pharmacological field survey work.
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