Ethnomedicinal botany of the Apatani in the Eastern Himalayan region of India.

This paper investigates the wealth of medicinal plants used by the Apatani tribe of Arunachal Pradesh. Apatani have traditionally settled in seven villages in the Ziro valley of Lower Subansiri district of Arunachal Pradesh in the Eastern Himalayan region of India. The present study has resulted in the documentation of 158 medicinal plant species used by the Apatani group of villages. These medicinal plant species were distributed across 73 families and 124 genera. Asteraceae was the most dominant family (19 species, 11 genera) of medicinal plants, followed by Zingiberaceae, Solanaceae, Lamiaceae and Araceae. For curing ailments, the use of aboveground plant parts was higher (80%) than the belowground plant parts in the Apatani group of villages. Of the aboveground plant parts, leaf was used in the majority of cases (56 species), followed by fruit. Different belowground plant forms such as root, tuber, rhizome, bulb and pseudo-bulb were used by Apatani as a medicine. About 52 types of ailments were cured by using these 158 medicinal plant species. The results of this study are further discussed in the changing socio-economic contexts.

Introduction

Tribal communities are mainly the forest dwellers who have accumulated a rich knowledge on the uses of various forests and forest products over the centuries. India possesses a total of 427 tribal communities, of these more than 130 major tribal communities live in North East India, which is comprised of the 8 states Meghalaya, Mizoram, Manipur, Tripura, Sikkim, Assam, Nagaland and Arunachal Pradesh. The major tribal communities of the North East India have been categorized into sub-tribes and if these sub-tribes are taken into account the total number of tribal groups reaches up to 300. In general, the tribes of North East India have been categorized into two broad ethnic communities, such as the Khasi and the Jaintia tribe of Meghalaya, who belong to 'Monkhemar' culture of Austoic dialect, and the rest of the tribal groups are basically Mongoloid, who belongs to Tibeto-Burman subfamily of Tibeto-Chinese group [1-3].

In the North East India, each state contains a number of tribal groups. Arunachal Pradesh is one of the states in North East India inhabited by 28 major tribes and 110 sub-tribes [4]. Arunachal Pradesh is the 12th mega biodiversity region of the world [5]. More than 545 species of orchids have been reported from the state, which is the highest number of orchid species known from any single state of India [6]. Such a rich biodiversity in the state has provided an initial advantage to its inhabitants for observing, and scrutinizing the rich flora and fauna for developing their own traditional knowledge. Most of the tribe economies have been historically engaged in subsistence agriculture or hunting and gathering. Over the years, they have developed a great deal of knowledge on the use of plants and plant products in curing various ailments.

A review of the literature reveals that many tribal areas and tribal communities in the eastern Himalayan region of India are either under explored or unexplored with regard to their floral wealth used in curing diseases. The Apatani is one such little studied tribe of Arunachal Pradesh [3]. Therefore, a need was felt to gather in-depth information on the plant species used by this tribal group and suggest that similar studies need to be carried out across the various groups of tribes for comparison as well as for documenting the knowledge which may be under threat due to the influence of modernization. The present paper thus aims to highlight and record in detail the traditional knowledge of the Apatani tribe on the use of medicinal plant species growing in and around their settlements.

Study area: Apatani group of villages

Literally, the word Apatani is composed of two words- 'Apa' and 'Tani'. According to the local language, 'Apa' means display of affection and 'Tani' stands for human race. The Apatani, generally, speak in their own language which has no script. Traditionally, they had settled in seven villages (e.g. Hong, Hari, Billa, Dutta, Hija, Mudang-Tage, and Michi Bamin) those were organized in accordance with the traditional lines of the three forefathers called Nichi-Nitii, Tinii-Diibo-Dre-Hija, and Talyang-Hao. These 7 villages are located in the Ziro valley of Lower Subansiri district in the central western part of Arunachal Pradesh in India between 26°55' – 28°21' N and 92°40' – 94°21' E. The Ziro valley (often called the Apatani valley) lies between the Panior and Kamla (Kuru) rivers at an altitude of 1524 to 2738 m a.m.s.l. The Apatani group of villages is located at 2200 m elevation. The Apatani migrated to the present location from the Talle Valley located in south eastern region [7]. The pattern of Apatani villages is that of string settlements (village houses are in a straight line) and homes are made of bamboo and timber. The Apatani belong to the Tibeto-Mongoloid stock, and trace their descent from one legendary ancestor, the Abotani.

The Apatani believe in indigenous religion called as 'Donyi-Polo' and are patriarchal in social system. The traditional village council, which regulates and administers the community, consists of three bodies namely Akha Buliyang, Yapha Buliyang and Ajang Buliyang. In each of these traditional institutions has one or two persons represent from each clan. Earlier, the Apatani had prominent tattoo marks on the face to distinguish themselves from other communities settled nearby. However, the practice of tattooing has been discouraged in the recent past and now is on the verge of extinction.

In 1991 census the population of Apatani was 22,526 (Table 1). The decadal (1991–2001) growth rate of the Apatani is 8.62%, which is much lower than that of the state (26.21%). The Ziro valley has an area of 1058 km2 of which 43 km2 is under agriculture, and remaining under forests, plantations and settlements. It is bounded with the areas traditionally belonging to neighbouring Nishi tribe. The land holding size varies from 0.02 to 10.00 ha with over 93% holdings consisting of 0.026–3.00 ha. The Ziro valley exhibits a humid sub-tropical to temperate type of climate with 108.1 cm rainfall and a temperature ranges from a maximum of 30.6°C to minimum of 1.1°C [8]. The climatic, altitudinal and geomorphological variations have shaped the two major vegetation types in and around the study area- sub-tropical forests and temperate forests. Sub-tropical forests in the study area are represented by Castanopsis indica, Acer sp., Pinus wallichiana and Pinus roxburghii, whereas, the temperate forests are represented by Quercus glauca, Alnus nepalensis, Castanopsis indica, Pyrus sp., Prunus sp., Populus sp. and Acer sp [9,10]. Many shrub species such as Berberis wallichiana, Viburnum foetidum, Prunus sp., Rubus sp., Spirea sp. and Symplocos sp. occur in the forested areas.

Table 1

Demographic profile of the Apatani in Ziro valley of Arunachal Pradesh

Year	Population		% to state
	Apatani	Arunachal Pradesh
1961	10,793	3,36,588	3.21
1971	12,888	4,68,511	2.75
1981	16,580	6,31,839	2.62
1991	22,526	8,64,558	2.61
2001	24,650	10,91,117	2.26

Source: Census of India, Part IX-B, Government of India.

Medicinal plants survey

A literature survey was carried out for compilation of existing information on the medicinal plants used by Apatani villagers [2,3,10-14]. In addition, field surveys in Apatani villages were undertaken during May and June 2005 to gather data on the indigenous uses of medicinal plant species by the Apatani. During the survey period, information was also gathered using semi-structured questionnaires on types of ailments cured by the traditional use of medicinal plants and plant parts used in curing different ailments. Cross-checking of data was made with the help of group discussions among different age classes of Apatani villagers that include both the genders of the society. The participant observation method was also employed to understand the methods and techniques adopted by the Apatani in curing diseases. The surrounding forested area and agricultural land of the Apatani villages were also surveyed with local youths and knowledgeable elders for the identification of various medicinal plant species and their indigenous uses. Since there is lack of comprehensive records on floral diversity of North East Himalaya including Arunachal Pradesh, the plant specimens were identified through various floral inventories [10,13,15]. The collected information was analyzed, and correlation was made between different genera and species of the medicinal plants in order to understand the pattern in medicinal plant uses and occurrences.

Results and discussion

The Apatani mainly subsist on agriculture and animal husbandry. Wet-rice cultivation is their most important agriculture practice. One of the Apatani proverbs reads "Tanii hii jebi danii", which means the Apatani depend on wet-rice cultivation. The Apatani have also developed a unique system of fish farming in their wet-rice croplands. They use available natural resources such as bamboo, cane, pine, Phragmites sp. and Castanopsis sp. in order to check the soil erosion, to conserve the soil fertility, to cultivate varieties of rice landraces, and to culture the fish in an integrated manner. Two species of bamboo (Phyllostachys bambusoides and Dendrocalamus hamiltonii) are also cultivated in private lands by the Apatani for construction of houses and other domestic uses. Bamboo shoots are also consumed by the Apatani as a vegetable. Apong, a locally prepared beer by fermenting rice, finger millet and barley, is an important beverage of the Apatani, which they prefer to consume with mutton. Domestic and semi-domestic cattle also play important role in maintaining the economic status of the Apatani. Possessing a large number of domestic animals is an indication of the prosperity of their respective owner [16]. Mithun (Bos frontalis) is preferred mostly for the meat. In addition, pigs, cows, and multiple varieties of birds and fish are consumed by the Apatani. A number of wild edible fruits and vegetables are also collected by the Apatani from the nearby forested areas to supplement the domestic nutritional requirements.

Traditionally, the Apatani group of villages was not only familiar with the knowledge of medicinal plants but they were also expert traders and met their necessities in exchange of paddy, which was always in excess of their requirements [17]. Earlier, they had no connection with the plains of Assam due to obstructions created by the Nishi who were earning a lot by acting as middlemen between the Apatani and the people residing in the plains. However, the Apatani had occupied a compact area in Ziro valley and were one of the self-sufficient tribes in North East India [8]. Their immediate dependence on nature had developed knowledge which ultimately is reflected in their traditional culture, religion, local belief, folklore, taboos language and dialects. For many centuries, the Apatani had kept alive a self-managed system of folk medicine that was mainly based on herbal remedies [10]. Their ingenuity still reflects their traditional management and sharing of natural resources in a way that there is optimum utilization of such resources [8,18]. The Nishi are one of the neighbours of the Apatani who live at lower elevations and are the most populous tribe in the state. Over the past few decades, the interaction between the Apatani and the Nishi has increased many fold due to migration of Apatani people in search of better education in Itanagar, a capital of Arunachal Pradesh. The availability of motor roads and the invasion of modern civilization have also enhanced the day to day interaction and the exposure of the Apatani to the rest of the world. Such interaction has provided a possible sharing of traditional knowledge of the Apatani with their neighbouring community.

During the present course of investigations, a total of 158 medicinal plant species used by the Apatani group of villages were documented. These medicinal plant species were distributed across 73 families and 124 genera (Table 2). In terms of number of medicinal plant species, Asteraceae was the most dominant family (19 species, 11 genera) of medicinal plants, followed by Zingiberaceae, Solanaceae, Lamiaceae, Araceae, and Verbanaceae (Table 3). There was a significant positive correlation (r = 0.92, p > 0.01) between the number of genera and number of species used as medicine by the Apatani (Figure 1). The invention of maximum number of uses of Asteraceae by the Apatani tribe demonstrates the dominance of Asteraceae around the Apatani group of villages. Asteraceae is the most dominant family of medicinal plants across the North Eastern States of India [13].

Table 2

Medicinal plant species, plant parts used and ailments cured by the Apatani of Ziro valley in Arunachal Pradesh

Sl No.	Species	Family	Part used	Uses
1	Acorus calamus L.	Araceae	Root	Cut, wounds, skin diseases, bone fracture
2	Ageratum conyzoides L.	Asteraceae	Leaf	Cut, wounds
3	Allium cepa L.	Liliaceae	Bulb	Eye pain
4	Allium hookeri Thwait.	Liliaceae	Bulb	Eruption of skin, cough, cold, wounds
5	Alocasia forniculata (Roxb.) Schott.	Araceae	Root	Crack of heels
6	Alstonia scholaris (L.) Br.	Apocynaceae	Leaf, bark	Headache, stomach disorder, menstrual disorder
7	Amomum aromaticum Roxb.	Zingiberaceae	Leaf, seed	Fever, abortion
8	Amorphophallus paeoniifolius (Dennst.) Nicolson	Araceae	Corn	Piles
9	Andrographis paniculata (Burm. f.) Wall. ex Nees	Acanthaceae	Leaf	Dysentery
10	Anisomeles indica (L.) O.K.	Lamiaceae	Shoot	Bodyache
11	Angiopteris evecta (Forst.) Hoffm.	Angiopteridaceae	Stem	Health tonic
12	Antidesma acidum Retz.	Euphorbiaceae	Leaf	Wounds
13	Argemone mexicana L.	Papaveraceae	Shoot	Skin diseases
14	Artemisia indica Willd.	Asteraceae	Leaf	Bodyache, asthma, skin diseases
15	Artemisia maritima L.	Asteraceae	Shoot	Blood purification
16	Artemisia nilagirica (Cl.) Pamp.	Asteraceae	Leaf	Cough, headache, sores
17	Asplenium nidus L.	Aspleniaceae	Leaf	Ulcer
18	Barleria prionitis L.	Acanthaceae	Leaf	Cough
19	Begonia roxburghii (Miq.) DC.	Begoniaceae	Leaf	Indigestion
20	Berberis wallichiana (Wall.) Brongn.	Berberidaceae	Fruit, root	Indigestion, bodyache
21	Bergenia ciliata (Haw.) Sternb.	Saxifragaceae	Root, leaf	Cut, wounds
22	Brassiopsis glomarulata (Bl.) Regel.	Araliaceae	Fruit	Cough
23	Buddleja asiatica Lour.	Buddlejaceae	Leaf	Inflammation
24	Callicarpa macrophylla Vahl	Verbenaceae	Leaf	Headache
25	Callicarpa vastita Roxb.	Verbenaceae	Leaf	Indigestion
26	Calotropis gigantea (L.) Br.	Asclepiadaceae	Root	Dog bite
27	Canarium resiniferum Brace ex King	Burseraceae	Fruit	Urinary complaints
28	Capparis spinosa Lam.	Capparaceae	Root	Rheumatic pain
29	Cardamine hirsuta L.	Brassicaceae	Leaf	Indigestion
30	Castanopsis tribuloides (Sm.) DC.	Fagaceae	Stem	Cough, goiter, indigestion
31	Centella asiatica L.	Apiaceae	Shoot	Constipation, gastritis, blood purification
32	Chenopodium ambrosioides L.	Chenopodiaceae	Leaf	Toothache
33	Christella parasitica (L.) Lev.	Thelypteridaceae	Fronds	Cut, wounds
34	Chromolaena odorata (L.) King & Robinson	Asteraceae	Leaf	Cut, wounds, headache, fever
35	Cirsium lapskyle Petral.	Asteraceae	Shoot	Indigestion
36	Cissampelos pareira L.	Menispermaceae	Tuber	Health tonic
37	Clerodendrum glandulosum Coleb. ex Wall.	Verbenaceae	Leaf	Blood pressure, fever, cough
38	Clerodendrum serratum (L.) Moonb	Verbenaceae	Leaf	Eye disorders
39	Coelogyne pectata Lindl.	Orchidaceae	Pseudobulb	Burns
40	Colocasia affinis Schott	Araceae	Leaf	Fever, respiratory disorder
41	Crassocephalum crepidioides (Benth.) Moore	Asteraceae	Leaf	Indigestion, headache, stomachache, cut, wounds
42	Crotolaria pallida Ait.	Fabaceae	Root	Bodyache
43	Croton roxburghii Balak	Euphorbiaceae	Fruit	Indigestion
44	Curcuma caesia Roxb.	Zingiberaceae	Rhizome	Cough, asthma
45	Curcuma aromatica Salisb.	Zingiberaceae	Whole plant	Blood purification
46	Curcuma zedoaria Rosc.	Zingiberaceae	Rhizome	Cold, cough
47	Cuscuta reflexa Roxb.	Cuscutaceae	Whole plant	Purgative
48	Cyathea gigantea (Wall. ex Hk. f.) Holt.	Cyatheaceae	Leaf	Bodyache
49	Cyathula prostrata (L.) Bl.	Amaranthaceae	Shoot	Appetizer, dysentery, skin diseases
50	Cymbidium aloifolium (L.) Sw.	Orchidaceae	Tuber	Wounds
51	Dendrocnide sinuta (Bl.) Chew.	Urticaceae	Leaf	Urogenital disorder, toothache, dysentery
52	Dicranopteris linearis (Burm. f.) Und.	Gleicheniaceae	Whole plant	Indigestion
53	Dicrocephala bicolor (Roth) Sch.	Asteraceae	Shoot	Digestive problems
54	Dillenia indica L.	Dilleniaceae	Furit	Stomachache
55	Dioscorea alata L.	Dioscoraceae	Tuber	Indigestion
56	Dioscorea bulbifera L.	Dioscoraceae	Tuber	Indigestion
57	Dioscorea hamiltonii Hk. f.	Dioscoraceae	Tuber	Dysentery
58	Diplazium esculentum (Retz.) Sw.	Athyriaceae	Fronds	Constipation
59	Ecbolium viride (Forsk) Alston	Meliaceae	Root	Rheumatism
60	Eclipta prostrata (L.) L.	Asteraceae	Shoot	Cut, wounds
61	Elaeagnus caudata Sch. ex Momiyama	Elaeagnaceae	Fruit	Health tonic
62	Elaeagnus pyriformis Hk. f.	Elaeagnaceae	Fruit	Constipation
63	Elatostema platyphyllum Wedd.	Urticaceae	Root	Vomiting
64	Elsholzia blanda (Benth.) Benth.	Lamiaceae	Leaf	Itching
65	Eluesine coracana (L.) Gaertn.	Poaceae	Grains	Stomach disorder, tonic, cold
66	Eupatorium odoratum L.	Asteraceae	Leaf	Wounds, cut
67	Erigeron bonariensis L.	Asteraceae	Leaf	Nose block
68	Eryngium foetidum L.	Apiaceae	Seed	Madness, headache
69	Ficus benjamina L.	Moraceae	Stem	Stomach disorder
70	Ficus hirta Vahl	Moraceae	Fruit	Wounds, cut
71	Gerbera pilosellioides (L.) Cass.	Asteraceae	Leaf	Rheumatic pain
72	Gloriosa superba L.	Liliaceae	Tuber	Killing lice in hairs
73	Gmelina arborea Roxb.	Verbenaceae	Leaf	Stomach disorder
74	Gynostemma pedata Bl.	Cucurbitaceae	Leaf	Throat ache
75	Gynura biscolor (Roxb. ex Willd.) DC.	Asteraceae	Leaf	Intestinal worms
76	Gynura nepalensis DC.	Asteraceae	Leaf	Indigestion
77	Hedychium coronarium Koen.	Zingiberaceae	Rhizome	Bodyache
78	Hedychium dekianum Rao & Verma	Zingiberaceae	Rhizome	Cut, wounds
79	Hedychium spicatum Buch.-Ham. ex Sm.	Zingiberaceae	Rhizome	Stomach disorder
80	Hibiscus rosa-sinensis L.	Malvaceae	Flower	Reproductive disorders
81	Houttuynia cordata Thunb.	Saururaceae	Shoot	Freshness, good sleep, heart disorders
82	Hyptis suaveolens (L.) Poit.	Lamiaceae	Leaf	Itching, cough, cold
83	Hypericum japonicum Thunb. ex Murr.	Hypericaceae	Stem	Cut, wounds
84	Impatiens latifolia L.	Balsaminaceae	Leaf	Headache, digestive disorder
85	Impatiens racemosa DC.	Balsaminaceae	Leaf	Digestive disorder
86	Indigofera tinctoria L.	Fabaceae	Root	Wound
87	Jasminum humile L.	Oleaceae	Root	Ringworm
88	Laginaria siceraria (Molina) Standl.	Cucurbitaceae	Fruit	Burns
89	Leonotis nepetifolia R. Br.	Lamiaceae	Seed	Burns
90	Lithocarpus dealbatus (Miq.) Rehder	Fagaceae	Fruit	Indigestion
91	Litsea cubeba (Lour.) Pers.	Lauraceae	Fruit	Cough, cold, hair tonic, indigestion, good sleep
92	Litsea salicifolia (Nees) Hk.f.	Lauraceae	Fruit	Bone fracture, stomach disorder
93	Lygodium scandens (L.) Sw.	Schizaeaceae	Leaf	Skin diseases
94	Mahonia napalensis DC.	Berberidaceae	Stem	Itching
95	Measa indica (Roxb.) DC.	Myrsinaceae	Fruit	Indigestion
96	Mikania micrantha Kunth.	Asteraceae	Leaf	Itching, skin diseases, headache
97	Miliusa roxburghiana (Wall. ex Griff.) Hk. f. & Th.	Annonaceae	Leaf	Headache
98	Molineria crassifolia Baker	Hypoxidaceae	Fruit	Diarrhoea
99	Molineria recurveta (Dryand) Hebbert.	Hypoxidaceae	Leaf	Bodyache
100	Mucuna pruriens (L.) DC.	Fabaceae	Stem	Eye disorder
101	Murraya koenigii (L.) Spr.	Rutaceae	Leaf	Stomach trouble
102	Musa paradissica L.	Musaceae	Fruit	Indigestion
103	Myrica esculenta Ham. ex D. Don.	Myricaceae	Fruit, bark	Indigestion, skin eruption
104	Myrsine semiserrata Wall.	Myrsinaceae	Seed	Skin diseases
105	Oenanthe javanica (Bl.) DC.	Apiaceae	Shoot	Indigestion
106	Oroxylum indicum (L.) Vent.	Bignoniaceae	Seed	Purgative, headache
107	Osbeckia stellata Buch.-Ham. ex D. Don	Melastomataceae	Leaf	Toothache
108	Oxalis corniculata L.	Oxalidaceae	Shoot	Appetizer, headache
109	Paedaria foetida L	Rubiaceae	Stem	Gastritis, diarrhea, stomach disorder
110	Passiflora foetida L.	Passifloraceae	Fruit	Respiratory disorder
111	Photinia integrifolia Lindl.	Rosaceae	Fruit	Indigestion
112	Perilla frutescens (L.) Britt.	Lamiaceae	Seed	Fever, headache
113	Physalis angulata L.	Solanaceae	Fruit	Gastric trouble
114	Physalis minima L.	Solanaceae	Fruit	Gastric trouble
115	Physalis peruviana L.	Solanaceae	Leaf	Pain in pregnancy
116	Picrorhiza kurrooa Benth.	Scrophulariaceae	Root	Cold, fever
117	Pinus roxburghii Sarg.	Pinaceae	Seed	Indigestion
118	Piper brachystachyum Wall.	Piperaceae	Seed	Cough
119	Piper trioicum Roxb.	Piperaceae	Root	Cough
120	Plantago major L.	Plantaginaceae	Leaf	Constipation
121	Plectranthus japonicus (Burm. f.) Koidz.	Acanthaceae	Leaf	Fever
122	Polygonum nepalense Meissn.	Polygonaceae	Leaf	Indigestion
123	Polygonum perfoliatum L.	Polygonaceae	Leaf	Indigestion
124	Portulaca oleracea L.	Portulacaceae	Stem, leaf	Appetizer
125	Pouzolzia hirta (Bl.) Hassk.	Urticaceae	Root	Constipation
126	Pterospermum acerifolium Willd.	Sterculiaceae	Flower	Earache
127	Rhus chinensis Miller	Anacardiaceae	Fruit	Blood dysentery
128	Rubia cordifolia L.	Rubiaceae	Shoot	Stomachache
129	Rubus calycinus Wall.	Rosaceae	Fruit	Stomach disorder
130	Rubus ellipticus Sm.	Rosaceae	Fruit	Indigestion
131	Rubus paniculatus Sm.	Rosaceae	Fruit	Stomach disorder
132	Rubus roseafolius Sm.	Rosaceae	Fruit	Indigestion
133	Rumex nepalensis Spr.	Polygonaceae	Leaf	Indigestion
134	Saurauria roxburghii Wall.	Saurauriaceae	Leaf	Constipation
135	Schefflera glomerata L.	Araliaceae	Fruit	Indigestion
136	Schizostachium capitatum (Munro) Majumdar	Poaceae	Shoot	Diarrhea, dysentery, stomach disorder
137	Senna alata (L.) Roxb.	Caesalpiniaceae	Leaf	Skin diseases
138	Senna tora (L.) Roxb.	Ceasalpiniaceae	Leaf	Low blood pressure
139	Sphenomeris chinensis (L.) Maxon	Lindsaeceae	Fronds	Sprains
140	Solanum kurzii Brace ex Prain	Solanaceae	Fruit	Cough, worms infestation
141	Solanum myriacanthum Dunal	Solanaceae	Seeds	Toothache
142	Solanum nigrum L.	Solanaceae	Leaf	Liver tonic, indigestion
143	Solanum torvum Sm.	Solanaceae	Fruit	Cough, skin diseases
144	Sonchus asper (L.) Hill	Asteraceae	Shoot	Indigestion
145	Sonchus arvensis L.	Asteraceae	Shoot	Stomachache, gastritis
146	Spilanthus clava L.	Asteraceae	Leaf	Throat pain
147	Spilanthes paniculata DC.	Asteraceae	Leaf	Constipation
148	Stellaria media (L.) Vill.	Caryophyllaceae	Leaf	Itching
149	Stereospermum chelonoides (L. f.) DC.	Bignoniaceae	Leaf	Sprain
150	Strobilanthus helictus T. Anders.	Acanthaceae	Shoot	Indigestion
151	Terminalia chebula Retz.	Combretaceae	Fruit	Cough
152	Toddalia aculeata Pers.	Rutaceae	Fruit	Throat pain
153	Urtica dioica L.	Urticaceae	Leaf	Bone fracture
154	Vernonia cinerea (L.) Less	Asteraceae	Leaf	Indigestion
155	Zanthoxylum acanthopodium DC.	Rutaceae	Fruit	Dysentery
156	Zanthoxylum armatum DC.	Rutaceae	Fruit	Cold, cough, fever, appetizer
157	Zanthoxylum oxyphyllum Edgew.	Rutaceae	Fruit	Stomach disorder
158	Zingiber officinale Rosc.	Zingiberaceae	Rhizome	Cough

Table 3

Dominant families of medicinal plants used by the Apatani in terms of number of species occupied

Family	Genera	Species
Asteraceae	11	19
Zingiberaceae	4	8
Solanaceae	2	7
Lamiaceae	5	5
Araceae	5	5
Verbenaceae	3	5
Rutaceae	3	5
Rosaceae	2	5
Urticaceae	4	4
Acanthaceae	4	4

Figure 1

Relationship between genera and species richness of medicinal plants used by the Apatani in Ziro valley of Arunachal Pradesh.

Different parts of medicinal plant species were used by the Apatani as a medicine. For curing ailments, the use of aboveground plant parts was higher (80%) than the belowground plant parts. Of the aboveground plant parts, leaf was used in the majority of cases (56 species), followed by fruits. Different belowground plant forms such as root, tuber, rhizome, bulb and pseudo-bulb were also used by the Apatani as a source of curing ailments (Table 4). The whole plant of 3 species [e.g. Curcuma aromatica Salisb., Cuscuta reflexa Roxb. and Dicranopteris linearis (Burm. f.) Und.] was used as medicine. These 158 medicinal plant species were used in curing about 52 types of ailments, of which the highest numbers of plant species (40 species) were used for the treatment of gastrointestinal disorders such as indigestion and constipation. About 19 medicinal plant species were used in curing cough and cold, and 15 medicinal plant species were used for healing cuts and wounds (Table 5).

Table 4

Patterns in Apatani use of medicinal plant parts

Aboveground plant parts used	Number of Species	Belowground plant parts used	Number of Species
Whole shoot	15	Root	14
Leaf	56	Tuber	6
Fruit	31	Rhizome	6
Seed	10	Bulb	2
Stem	6	Pseudo-bulb	1
Fronds	4	Corn	1
Bark	2
Flower	2
Total	126	Total	30

Table 5

Major ailments cured by the Apatani in terms of using the plant species

Ailments	Number of plants used
Indigestion	40
Cough and cold	19
Cut and wounds	15
Headache	12
Stomach disorder	11
Skin diseases	11
Fever	8
Body-ache	6
Dysentery	6
Throat-ache	5

Previous studies carried out in North East India have reported 41 medicinal plant species used by the Apatani of Arunachal Pradesh [13]. However, they had selected many North Eastern States and 12 different tribal communities for investigations. Based on their experiences, they had suggested the need of carrying out detailed investigations of each tribe. So far different authors have reported 1350 species of plants used in ethnomedicinal preparations, 665 species of food plants and 899 species for miscellaneous uses from the entire North East India [3]. The present inventory of 158 medicinal plant species as used by the Apatani is one of its kinds in terms of the highest number of species recorded so far used by a single tribe of the North East India. This fact provides a strength to the statements of earlier researchers that North East India is still under-explored and certain areas in the district of Subansiri still remain unexplored [3,10]. Hence, a need for detailed investigations of ethnobotanical knowledge held by each tribal community in North East India is required before such valuable knowledge vanishes. In spite of the rich wealth of bio-resources and potential, development is far from meeting the expectations of local people in Arunachal Pradesh mainly in terms of existing health care facilities and herbal industries. Ethnomedicinal knowledge is also important from a humanitarian point of view in that in long run as this knowledge may help to identify important medicinal uses that can help in curing and healthcare around the world. Attempts should be made to share the benefits arising from such knowledge with its holders. The present inventory of medicinal plants used by the Apatani opens new avenues to scrutinize such a rich natural resource for further analysis in order to develop the potential of herbal medicine.