Open Access

Medicinal plants and traditional healing practices in ehotile people, around the aby lagoon (eastern littoral of Côte d'Ivoire)

Journal of Ethnobiology and Ethnomedicine201511:21

https://doi.org/10.1186/s13002-015-0004-8

Received: 6 September 2014

Accepted: 21 January 2015

Published: 14 March 2015

Abstract

Background

Access to useful plants is a growing problem in Africa, increased by the loss of natural vegetation and the erosion of traditional knowledge. Ethnobotany contributes to promote these indigenous knowledge. Despite the large diversity of ethnic groups in Côte d’Ivoire, few ethnomedicine researches have targeted these groups. Among the great Akan group, the Ehotile people are one of the smallest and oldest ethnic group around the Aby Lagoon. The goal of this study was to analyze the level of knowledge and use of medicinal plants by the Ehotile people, and moreover, contribute to build a database about useful plants of first Ivorian people.

Methods

Two sets of surveys were conducted in four Ehotile villages: a house-to-house freelist interview and an individual walk-in-the woods interview with some key informants identified by the community. Frequency of citation, Smith’s index, Use value and Informant Consensus Factor were used to estimate the local knowledge of medicinal plants.

Results

Medicinal plants are widely used by Ehotile people. Some were used in addition to modern prescriptions while for some disorders commonly called “African diseases” only plants are used. 123 species employed in the treatment of 57 diseases were listed. Specifically, the most common indications included malaria, sexual asthenia, troubles linked to pregnancy, dysmenorrhoea and haemorrhoids. Analysis of freelists suggested that Ehotile people has a good knowledge of medicinal plants and the most salient included Harungana madagascariensis, Alstonia boonei, Ocimum gratissimum and Xylopia acutiflora. Regarding the consensus among key informants, ICF values were low (<0.5), however category of infectious and parasitic diseases obtained the best agreement (ICF = 0.42). Following the local experts, 4 types of plants availability were distinguished: Abundant plants easy to collect, abundant plants difficult to harvest, scarce plants and endangered plants.

Conclusions

Despite the virtual disappearance of natural formations in Ehotile land, medicinal plants are important in the Ehotile health system. Medicinal plants are known and used alone or in addition to medical prescriptions to treat several ailments. However, some of them are becoming rare, and it is feared that this scarcity will result in the inevitable loss of associated knowledge and practices.

Keywords

Medicinal plantsTraditional knowledgeEhotileCôte d’Ivoire

Background

The contribution of traditional knowledge is invaluable in the long and costly process of developing drug molecules. Thanks to traditional medicine, more than 40% of commonly prescribed medicines throughout the world are directly or indirectly of natural origin [1]. The use of medicinal plants is still alive in African traditions. Indeed, medicinal plants serve as the primary source of healthcare for the majority of the Developing World’s population [2,3]. However, access to medicinal plants resources is a growing problem in Africa [3,4]. The loss of natural vegetation, due to various causes, is a major factor in the erosion of traditional knowledge.

Ethnobotany, field of Botany that analyzes the results of traditional uses of plants together with the cultural context in which the plants are used [5], contributes by its various approaches to preserve and promote this indigenous knowledge [6].

This approach that emphasizes on a user group (e.g. ethnic group) is not only still relevant [7], but also offers a greater opportunity to gather honest and reliable information in the field.

Many studies, in Africa that are dealing with medicinal uses of plants particularly in Côte d’Ivoire, are simple lists or concern ethnopharmacology. The main focus of studies into traditional pharmacopoeias is the perception of indigenous medicines and the ingredients used in their preparation or the chemical composition, pharmacology and toxicology of plants used [7].

The study of the use of plants, beyond the simple catalogue, using quantitative tools is extremely recent and works discussing the ultimate meaning of disease and the cultural dimension of its treatment are scarce in Côte d’Ivoire. In this country, the large diversity of ethnic groups contrasts with the paucity of ethnomedicine research targeting these groups. Yet, a few reference works [8-10] conducted among Ando, Bete, Abbey and Krobou people and major cross works [11,12] have shown that local specificities are also expressed through medicinal practices. In the complex ethnic mix that characterizes the bank of the Aby Lagoon (eastern littoral of Côte d’Ivoire), the Ehotile people (9 villages) differs from other Akan. The originality of these people is conferred by its territorial precedence, its history and lifestyle closely linked to the lagoon.

Some modern health facilities exist around the Aby lagoon. For example, the four large villages on the west bank of the Aby Lagoon (Etuessika, Melekoukro, N’galwa and Assomlan) have two rural health centres for an estimated 3,500 inhabitants. Each centre is served by one nurse and one midwife, i.e. one health worker for 875 inhabitants. This ratio is certainly significant compared to the Ivorian national ratio, which is 4.8 nurses and midwives per 10,000 inhabitants [13]. However, access to such centres is a major problem for some patients who have to travel a few kilometers or be evacuated by boat.

It’s known that when Western medicine is often absent or hard to access or too expensive, the use of remedies from plant becomes particularly significant [3,14]. In Ehotile area, this was a fact observed almost on a daily basis. Beside the State health workers, the traditional system of medicine is well established, based on healers whose reputation often goes beyond the borders of the village. For the four villages mentioned above, 15 confirmed healers were registered, i.e. one traditional health agent per 233 inhabitants [15]. The majority of these healers are Komian or acolytes of Komian. The Komian is a priest of traditional religion initiated according to the rites of an order which embodies invisible entities (Boson) whom he worships during public sessions of divination.

Moreover, the land occupied by Ehotile is one of the most degraded of the Ivorian Coast. Scarce natural vegetation that has withstood the plantations of coconut, oil palm or rubber is composed of the marshy patches and the islands of the Ehotile Islands National Park [16]. As the use of plants are often correlated with their availability [17], our study aimed to assess the knowledge and the use of medicinal plants (native or introduced regardless of their medicinal character) in the daily life by Ehotile people, contributing, therefore, to build an integrated database for expertise about useful plants of Ivorian people.

Beyond the study of the use and evaluation of the level of knowledge, our work also aims to probe the availability of the species used with local experts recognized in their community.

Methods

Study area

The Ehotile province is composed of 9 main villages round the Aby Lagoon. The survey was conducted in the four biggest, bordering the Ehotile Islands National Park: Mélékoukro, Assomlan (western bank) and Etuoboué and Akounougbé for the eastern bank (Figure 1). The climate of this zone is an equatorial transition type, characterized by four successive seasons: the long rainy season from March to July; the short dry season in August; the small rainy season from September to November and the large less rainy season, from December to February. The average annual rainfalls range from 1800 to 2000 mm and the annual average temperature is 26.4°C with a variation of 3°C.
Figure 1

Localisation of study area in Africa, Côte d’Ivoire and around the Aby lagoon.

The relief of the region is monotonous in the whole with some small plateaus of low altitudes (40 to 60 m) with irregular contours, separated by usually quite steep valleys. The soils in this area are generally hydromorphic on Quaternary or young marine sands with in some places, large accumulations of plant debris.

Concerning the vegetation, the study zone belongs to the Guinean Littoral Area [18]. The original vegetation (Licania eleosperma (Mildbr.) Prance & White and Drypetes aframensis Hutch. sub-littoral forest) has been replaced by cultivated areas. However, we can distinguish several types of vegetation including mangroves, coastal thickets, forests and plantations. In fact, in this area, due to the variety of soil conditions and trends, there is no dominant climax but a mosaic of edaphic groups.

Fishing is the main activity of the Ehotile people and until very recently (second quarter of the twentieth century), they were exclusively fishermen [19]. Fishing activity (individual or collective) is practiced by men and women. The men are responsible for fishing, the supply of firewood (mangrove wood, mostly) and women are engaged in fish preservation such as, smoking in readiness for marketing. Fishing activities are particularly intense during the long rainy season (May to July) and fall significantly in the dry season (January to April).

Agriculture is the second activity in the study area. From the stage of home consumption with food crops (cassava, yam, banana, etc.) it increased to the stage of cash crop with coconut, oil palm, pineapple and rubber. It is practiced by men and women. Women are mostly engaged in the cultivation of food (cassava and vegetables) while men are the owners of large plantations of coconut, oil palm, rubber or pineapple.

Survey method

Two sets of surveys were carried out. The first survey was achieved during a house-to-house interview (N = 55, 30 women and 25 men, age ranging from 32 to 76 years, with an average age of 47.7). Questions were: What are the common diseases here? Do you know and use plants to cure these diseases? Do you know people specialized in traditional treatment of these diseases with plants? Through this step, an initial list of plants used was given and a list of 15 resource persons recognized for their competence in the treatment of various pathologies was established.

The second survey involved some key informants selected among the previous list of identified resource persons (N = 8, 4 women and 4 men, age ranging from 46 to 70 years, with an average of 60 years). These informed persons were individually interviewed at home (Figure 2) or during a “Walk-in-the-woods” approach. This method involved walking with local people in the areas where they normally collected their medicinal plants while interviewing them [20]. Information on local names of plants and practices was collected. With these key informants who were often reluctant to give their medicinal recipes, our entry point was the availability of resources used. These resource persons followed the dynamics of the surrounding vegetation and knew the common species in their region, those which were rare and those which newly appeared. The collected vouchers were identified at the Herbarium of Ivorian National Floristic Centre (ABJ) and confirmed by the Late Prof. Aké Assi Laurent. Voucher specimens were deposited at the Laboratory of Botany of Nangui Abrogoua University (Abidjan) and at the Institut de Botanique Aké Assi d’Andokoi (Abidjan).
Figure 2

Mrs. Mosoma, one of the ehotile key informants on medicinal plants, recognized as an expert of women infertility and diseases of newborn and infant. She’s holding some plants, part of a recipe against infant fever attack.

Evaluation of local knowledge

There are several indices to scientifically estimate indigenous knowledge in a specific field [21]. However, the most commonly used are those based on informant consensus, i.e. the level of agreement among various interviewees (see [21-23]). These indices, using spontaneous quotations, are based on the principle that the greater the salience of a given plant or use in the community, the more likely it is to be mentioned [23,24].

One of the simplest and best known is the frequency of citation (Fq), i.e. the number of informants who mentioned a given species. It is a good index to evaluate the credibility of collected information and the level of knowledge within a surveyed population [25]. However, this index does not take into account the rank of appearance of an item in the list of citations. So the Smith’s index [25-27] was used. It is based on the frequency of citation, the rank and the length of citation lists and it ranges from 0 to 1 (maximum importance). The formula reviewed [27] is:
$$ S=\left\{{\displaystyle \sum \left[\left({L}_i-{R}_j+1\right)/{L}_j\right]}\right\}/N $$
where S is the salience of an individual item (Smith’s index), Li the length of each informant’s list, and Rj the rank of the item (here, the plant cited) in that list. In addition, the use-value (UV) was calculated for each plant using the following formula [22,28], modified from [29]:
$$ UV={\displaystyle \sum \frac{U_i}{N}} $$

where U i is the number of uses mentioned by each informant for a given species and N is the total number of informants. Use-value as opposed to the relative importance (RI) greatly emphasizes species that have many uses, even if those uses are known only by a few people [22].

Frequency of citation, Smits’s Index and use-value were used for house-to-house data analysis. Furthermore, the Informant Consensus Factor (ICF) was calculated, as follow [29], to assess the agreements among key informants:
$$ ICF=\frac{n_{ur}-{n}_t}{n_{ur}-1} $$

where n ur is number of use citation in each category and n t number of species used. ICF ranges from 0 (plants are chosen randomly, or informants do not exchange information about their use) to 1 (there is a well-defined selection criterion in the community and/or if information is exchanged between informant [29,30]).

Diseases identified were classified into broad categories (considered here as categories of use). The classification was adapted from the 10th version International Statistical Classification of Diseases and related Health Problems or ICD-10 [31].

Ethical consideration

Before being interviewed, local residents of each investigated village were briefed on the research project during an agreement meeting and educated prior informed consent was established following the recommendations of the International Society of Ethnobiology Code of ethics for the publication of this research and any accompanying images. Meetings were held in the village chief's court and the conclusions were sealed, each time with a libation, following the Ehotile customary protocol.

Results

Observations on Ehotile medicinal practices

Generally, plants constitute a major part in the health system of Ehotile people. Information on popular medicinal recipes is easily accessible. Among the diseases listed in our work, some are subject to a complementary treatment (modern prescriptions and medicinal plants) including malaria, diarrhoea, and headache. The first treatment is usually provided by the housewives. That is why basic medicinal plants such as Ocimum gratissimum L., Eclipta prostrata (L.) L., Capsicum frutescens L. are grown in the homegardens or backyards in village settings. These plants constitute a kind of living “pharmacy box”.

Beside diseases for which complementarity between traditional and modern medicines was observed, there are some disorders commonly called “African-diseases” for which modern medicines are not sought. For these, it is the healer who is solicited. In some cases, the complexity of the described symptoms or their non-organic origin has led to the retention of the local names of these ailments: Asema, elokposan or butumanklan.

Finally, there is a last category of diseases where treatment offered in health centres is not accepted by villagers. These illnesses include haemorrhoids, hydrocephalus or disorders of reproductive health (sexual asthenia, impotence or infertility).

Plants used in common traditional medicine by Ehotile people

The investigation yielded a list of 123 plant species, 96 after the house-to-house survey and 27 only collected with local experts (Table 1). These taxa were distributed in 113 genera and 52 plant families (44 of Dicotyledons, 6 of Monocotyledons and 2 of Pteridophytes). The richest ones were Leguminosae (15 species), Euphorbiaceae (9), Annonaceae (7), Apocynaceae (6) and Compositae (6).
Table 1

List of medicinal plants used by Ehotile people

Species

Voucher number

Family

Informant

Fq

Smiths’ S

Indication

Part used and administration mode

Abrus precatorius L.

Malan 758

Leguminosae

LP

0.04

0.015

Ophtalmia

Eye drops with leaf juice

Palpitations

Leaf juice swallowed

Adenia lobata (Jacq.) Engl.

Malan 504

Passifloraceae

LP

0.04

0.032

Ophtalmia

Eye drops with sap

Ageratum conyzoides L.

AD 128

Compositae

LP

0.04

0.016

Headache

Nose drops with leaf juice

Albertisia cordifolia (Mangenot & Miège) Forman

Malan 638, 718

Menispermaceae

LP, KI

0.07

0.04

Oedema

Topical application with crushed leaves

Albizia zygia (DC.) J. F. Macbr.

Malan 596

Leguminosae

LP, KI

0.02

0.018

Rheumatism

Topical application with crushed leaves

Alchornea cordifolia (Schumach. & Thonn.) Müll.Arg.

AD 224

Euphorbiaceae

LP, KI

0.05

0.047

White discharge

Enema with leaves mashed and diluted in water

Malaria

Leaves decoction drunk and taken as enema

Wound

Topical application with crushed leaves

Sexual asthenia

Leaves decoction drunk

Alstonia boonei (DC.) Willd.

Malan 630

Apocynaceae

LP, KI

0.35

0.294

Malaria

Leaves and bark decoction drunk and taken as enema

Alternanthera pungens Kunth

AD 132

Amaranthaceae

LP, KI

0.05

0.038

Convulsion

Body smeared with leaves mashed

Infant diarrhoea

Enema with leaves mashed and diluted in water

Anchomanes difformis (Blume) Engl.

Malan 570

Araceae

LP

0.04

0.023

Dysmenorrhoea

Enema with tuber mashed and diluted in water

Pregnancy care

Anthocleista nobilis G.Don

AD 63

Gentianaceae

LP, KI

0.04

0.034

Malaria

Body smeared with mashed bark

Rheumatism

Topical application with crushed roots

Antiaris toxicaria (Engl.) C.C. Berg

Malan 600

Moraceae

LP, KI

0.04

0.016

Hydrocephalus

Bathing with bark decoction

Azadirachta indica A.Juss.

 

Meliaceae

LP, KI

0.07

0.053

Malaria

Body smeared with mashed leaves, leaves decoction drunk

Bambusa vulgaris Wendel. ex Nees

Malan 447

Poaceae

LP, KI

0.09

0.06

Malaria

Leaves decoction drunk

Baphia nitida Lodd.

AD 166

Leguminosae

LP, KI

0.11

0.08

Bubo

Topical application with crushed leaves

Bad breath

Roots as chewing stick

Boil

Topical application with crushed leaves

Lumbar pain

Enema with mashed roots diluted in water

Bidens pilosa L.

AD 112

Compositae

LP, KI

0.09

0.061

Hydrocephalus

Body smeared with mashed leaves Enema with leaves mashed and diluted in water

Diarrhoea

Malaria

Giddiness

Blighia sapida Koenig

AD 196

Sapindaceae

LP

0.04

0.026

Lumbar pain

Enema with bark mashed and diluted in water

Malaria

Rheumatism

Topical application with crushed bark

Blighia welwitschii (Hiern) Radlk.

Malan 968

Sapindaceae

KI

-

-

Malaria

Enema with bark mashed and diluted in water Topical application with crushed bark

Rheumatism

Oedema

 

Bridelia micrantha (Hochst.) Baill.

AD 89

Phyllanthaceae

LP

0.04

0.031

Malaria

Enema with leaves mashed and diluted in water

Caesalpinia bonduc (L.) Roxb.

AD 240

Leguminosae

LP, KI

0.05

0.045

Malaria

Enema with leaves mashed and diluted in water

Sexual asthenia

Cajanus cajan (L.) Roxb.

AD 13

Leguminosae

LP, KI

0.02

0.012

Malaria

Bathing with leaves decoction

Capsicum frutescens L.

 

Solanaceae

KI

0.04

0.018

Serious disease of unknown origin

Ocular instillations with leaf juice

Contraception

Enema with fruits mashed and diluted in water

Carica papaya L.

 

Caricaceae

LP, KI

0.05

0.028

Contraception

Enema with leaves mashed and diluted in water

Malaria

Leaves decoction drunk

Carpolobia lutea G.Don

AD07

Polygalaceae

LP, KI

0.05

0.037

Sexual asthenia

Roots decoction drunk

Cassia alata L.

AD 15

Leguminosae

LP, KI

0.18

0.1

Dry patch

Topical application with crushed leaves

Malaria

Body smeared with leaves mashed

Constipation

Leaves decoction drunk

Cassia occidentalis L.

Malan 618

Leguminosae

LP, KI

0.07

0.04

Headache

Nose drops with leaf juice

Malaria

Leaves decoction drunk

Catharanthus roseus (L.) G.Don

 

Apocynaceae

LP

0.02

0.015

Inguinal hernia

Enema with mashed roots diluted in water

Ceiba pentandra (L.) Gaertn.

Malan 1001

Malvaceae

LP, KI

0.02

0.009

Diarrhoea

Enema with mashed leaves or bark diluted in water

Chassalia koly (Schumach.) Hepper

Malan 717

Rubiaceae

LP, KI

0.02

0.011

Headache

Eye drops with juice from roots

Cleistopholis patens (Benth.) Engl. & Diels

AD 68

Annonaceae

LP, KI

0.11

0.07

Rheumatism Elokposan

Topical application with crushed bark

Cnestis ferruginea Vahl ex DC.

Malan 395

Connaraceae

LP, KI

0.05

0.037

Hydrocephalus

Bathing with leaves decoction

Pregnancy care

Enema with roots mashed and diluted in water

Cocos nucifera L.

 

Arecaceae

LP

0.02

0.017

Raging toothache

Mouthwash with roots decoction

Butumanklan

Enema with roots mashed and diluted in water

Cola lateritia var. maclaudi (A.Chev.) Brenan & Keay

AD 176, Malan 812

Malvaceae

LP

0.02

0.014

Malaria

Body smeared with mashed leaves

Cola nitida (Vent.) Schott & Endl.

AD 163

Malvaceae

LP

0.02

0.009

Whitlow Chickenpox

Topical application with crushed bark

Costus afer Ker-Gawl.

Malan 1118

Costaceae

LP, KI

0.02

0.008

Palpitations

Oral instillations with crushed leaves

Dacryodes klaineana (Pierre) Lam.

Malan 777, 898

Burseraceae

LP, KI

0.02

0.007

Dysmenorrhoea

Enema with bark mashed and diluted in water

Daniellia thurifera Benn.

Malan 697

Leguminosae

LP, KI

0.05

0.026

Post-partum care

Bathing with leaves decoction

Desmodium adscendens (Sw.) DC.

Malan 443

Leguminosae

LP, KI

0.05

0.04

Pregnancy care

Enema with leaves mashed and diluted in water

Diarrhoea

Wound

Topical application with crushed leaves

Digitaria horizontalis Willd.

Malan 874

Poaceae

LP, KI

0.05

0.04

Oedema

Body smeared with mashed whole plant

Dioclea reflexa Hook.f.

Malan 994

Leguminosae

LP, KI

0.02

0.009

Infant fortification

Entire seed soaked in infant bathing water

Diospyros sanza-minika A.Chev.

Malan 809

Ebenaceae

LP, KI

0.02

0.003

Giddiness

Topical application with crushed bark

Eclipta prostrata (L.) L.

Malan 752

Compositae

LP, KI

0.07

0.041

Hydrocephalus

Body smeared with leaves mashed

Asema

Bathing with leaves decoction

Giddiness

Eye drops with leaf juice

Pregnancy care

Enema with leaves mashed and diluted in water

Malaria

Diarrhoea

Elaeis guineensis Jacq.

 

Arecaceae

LP, KI

0.02

0.01

Abortion

Enema with mashed roots diluted in water

Erythrina senegalensis DC.

Malan 856

Leguminosae

LP

0.02

0.006

Rheumatism

Topical application with crushed bark

Oedema

Body smeared with mashed leaves

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Euadenia trifoliolata (Schumach. & Thonn.) Oliv.

Malan 695

Capparaceae

LP, KI

0.02

0.009

Haemorrhoids

Enema with mashed roots diluted in water

Eugenia whytei Sprague

Malan 897

Myrtaceae

LP, KI

0.05

0.021

Bad breath

Roots as chewing stick

Infant diarrhoea

Enema with mashed leaves diluted in water

Nausea

Leaves chewed

Euphorbia hirta L.

AD 25

Euphorbiaceae

LP, KI

0.11

0.048

Measles

Body smeared with mashed leaves

Pregnancy care

Enema with whole plant mashed and diluted in water

Diarrhoea

Ficus exasperata Vahl

AD 48

Moraceae

LP

0.02

0.009

Injury

Topical application with crushed roots

Flagellaria guineensis Schumach.

AD 04

Flagellariaceae

LP, KI

0.04

0.005

Malaria

Bathing with leaves decoction

Delay of motor function

Enema with roots mashed and diluted in water

Garcinia kola Heckel

AD 45

Clusiaceae

LP

0.04

0.025

Bad breath

Roots as chewing stick

Sexual asthenia

Glyphaea brevis (Spreng.) Monachino

AD 206

Malvaceae

LP

0.02

0.011

Pregnancy care

Enema with leaves mashed and diluted in water

Gossypium barbadense L.

AD 177

Malvaceae

LP, KI

0.02

0.008

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Hallea ledermannii (K.Krause) Verdc.

Malan 787, AD 227

Rubiaceae

LP, KI

0.04

0.013

Malaria

Bathing with bark decoction

Convulsion

Body smeared with mashed bark

Harungana madagascariensis Lam. ex Poir.

Malan 719

Hypericaceae

LP, KI

0.53

0.38

Malaria

Bark decoction drunk, taken as enema and for bathing, Body smeared with mashed bark

Heterotis rotundifolia (Sm.) Jacq.-Fél.

Malan 552

Melastomataceae

LP, KI

0.05

0.04

Diarrhoea

Enema with leaves mashed and diluted in water

Hoslundia opposita Vahl

Malan 953

Lamiaceae

LP

0.02

0.016

Convulsion

Eye drops with leaf juice

Icacina mannii Oliv.

Malan 1042

Icacinaceae

LP, KI

0.15

0.083

Dysmenorrhoea

Tuber decoction drunk

Sexual asthenia

Haemorrhoids

Imperata cylindrica (L.) Raeuschel

Malan 458

Poaceae

KI

-

-

Convulsion

Body smeared with mashed leaves

Jatropha curcas L.

AD 58

Euphorbiaceae

LP

0.02

0.009

Abortion

Enema with leaves mashed and diluted in water

Jatropha gossypiifolia L.

AD 139

Euphorbiaceae

LP

0.02

0.004

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Khaya ivorensis A.Chev.

Malan 419

Meliaceae

LP

0.04

0.019

Haemorrhoids

Enema with bark mashed and diluted in water

Sexual asthenia

Bark soaked in local alcohol and drunk

Kigelia africana (Lam.) Benth.

AD 201

Bignoniaceae

LP, KI

0.07

0.048

Swollen breasts

Topical application with fruits, leaves and bark crushed

Sterility

Enema with bark mashed and diluted in water

Lannea nigritana (Scott-Elliot) Keay

AD 95

Anacardiaceae

LP

0.02

0.006

Ophtalmia

Eye drops with leaf juice

Toohtache

Mouthwash with leaves decoction

Lophira alata Banks ex Gaertn. f.

Malan 340

Ochnaceae

LP

0.04

0.012

Bad breath

Roots as chewing stick

Elokposan

Bathing with bark decoction

Malaria

Mallotus oppositifolius (Geisel.) Müll.Arg.

AD 278

Euphorbiaceae

LP

0.02

0.007

Asema

Bathing with leaves decoction

Mangifera indica L.

 

Anacardiaceae

KI

-

-

Malaria

Bathing with bark decoction

Manihot esculenta Crantz

 

Euphorbiaceae

LP, KI

0.09

0.022

Headache

Nose drops with leaf juice

Ophtalmia

Eye drops with leaf juice

Infant diarrhoea

Enema with roasted fruits mashed and diluted in water

Diarrhoea

Gonorrhoea

Enema with leaves mashed and diluted in water

Manotes longiflora Baker

Malan 886

Connaraceae

LP

0.04

0.006

Ophtalmia

Eye drops with leaf juice

Dysenteria

Enema with leaves mashed and diluted in water

Mareya micrantha (Benth.) Müll.Arg.

Malan 734

Euphorbiaceae

KI

-

-

Childbirth

Leaves decoction drunk

Microdesmis keayana Léonard

Malan 659

Pandaceae

LP, KI

0.05

0.014

Bad breath

Roots as chewing stick

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Microglossa pyrifolia (Lam.) O.Ktze

AD 92

Compositae

LP, KI

0.07

0.044

Hydrocephalus

Bathing with leaves decoction, body smeared with mashed leaves, leaves decoction drunk

Asema

Bathing with leaves decoction

Convulsion

Nose drops with leaf juice, body smeared with mashed leaves

Pregnancy care

Enema with leaves mashed and diluted in water

Dysmenorrhoea

Microgramma owariensis (Desv.) Alston

AD 39

Polypodiaceae

LP, KI

0.05

0.028

Sterility

Enema with whole plant mashed and diluted in water

Dysmenorrhoea

Microsorum scolopendria (Burm.f.) Copel.

AD 57

Polypodiaceae

LP, KI

0.04

0.014

Dysmenorrhoea

Enema with whole plant mashed and diluted in water

Milicia excelsa (Welw.) C.C.Berg

Malan 785

Moraceae

KI

-

-

Hydrocephalus

Bathing with bark decoction, body smeared with mashed bark

Dysenteria

Enema with mashed bark diluted in water

Butumanklan

Mitracarpus scaber Zucc.

AD 156

Rubiaceae

LP

0.01

0.018

Dry patchs

Topical application with crushed leaves

Lumbar pain

Enema with mashed leaves diluted in water

Momordica charantia L.

Malan 1011

Cucurbitaceae

LP, KI

0.11

0.029

Malaria

Bathing with leaves decoction, body smeared with mashed leaves

Chickenpox

Abortion

Body smeared with mashed leaves, Enema with seeds mashed and diluted in water

Monodora myristica (Gaertn.) Dunal

Malan 780

Annonaceae

LP, KI

0.01

0.029

Haemorrhoids

Seeds added to enema preparation

Morinda lucida G.Don

AD 175

Rubiaceae

KI

-

-

Infant diarrhoea

Enema with bark mashed and diluted in water

Musa paradisiaca L.

 

Musaceae

KI

-

-

Malaria

Bathing with leaves decoction

Ophtalmia

Eye drops with sap

Nephrolepis biserrata (Sw.) Schott

Malan 599

Nephrolepidaceae

LP, KI

0.05

0.009

Remove splinters

Topical application with crushed leaves

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Newbouldia laevis (P. Beauv.) Seem. ex Bureau

Malan 1027

Bignoniaceae

LP, KI

0.05

0.024

Dysmenorrhoea

Enema with leaves mashed and diluted in water

Hoarseness

Bark decoction drunk

Raging toothache

Mouthwash with bark decoction

Dysmenorrhoea

Enema with mashed bark diluted in water

Remove splinters

Topical application with crushed leaves

Fracture

Topical application with crushed bark

Nymphaea lotus L.

Malan 925

Nympheaceae

LP

0.04

0.008

Pregnancy care

Enema with leaves mashed and diluted in water

Delay of motor function

Ocimum americanum var. americanum L.

AD 16

Lamiaceae

LP, KI

0.04

0.014

Lumbar pain

Enema with leaves mashed and diluted in water

Swollen breasts

Topical application with crushed leaves

Convulsion

Eye drops with leaf juice

Ocimum gratissimum L.

Malan 1009

Lamiaceae

LP, KI

0.38

0.245

Convulsion

Eye drops with leaf juice

Headache

Nose drops with leaf juice

Cough

Nose or eye drops with leaf juice

Fever attack

Enema with mashed leaves diluted in water

Malaria

Dysmenorrhoea

Pregnancy care

Infant diarrhoea

Stomachache

Palisota hirsuta (Thunb.) Engl.

Malan 984

Commelinaceae

KI

-

-

Delay of motor function

Enema with leaves mashed and diluted in water

Dysmenorrhoea

Parinari excelsa Sabine

AD 148

Chrysobalanaceae

KI

-

-

Sexual asthenia

Bark soaked in local alcohol and drunk

Haemorrhoids

Enema with bark mashed and diluted in water

Dysmenorrhoea

Paullinia pinnata L.

AD 124, Malan 853

Sapindaceae

LP, KI

0.2

0.122

Hydrocephalus

Bathing with leaves decoction

Pentaclethra macrophylla Benth.

Malan 1110

Leguminosae

LP, KI

0.05

0.03

Hydrocephalus

Bathing with bark decoction, body smeared with mashed bark

Malaria

Body smeared with mashed bark

Phaulopsis ciliata (Willd.) Hepper

Malan 954

Acanthaceae

KI

-

-

Colic

Enema with leaves mashed and diluted in water

Phyllanthus amarus Schumach. & Thonn.

AD 144

Phyllanthaceae

LP, KI

0.13

0.037

Chickenpox

Body smeared with whole plant mashed

Pregnancy care

Enema with leaves mashed and diluted in water

Malaria

Whole plant decoction drunk

Picralima nitida (Stapf) T. & H.Durand

AD 237

Apocynaceae

LP, KI

0.09

0.082

Inguinal hernia

Enema with seeds mashed and diluted in water

Piptadeniastrum africanum (Hook.) Brenan

Malan 1108

Leguminosae

KI

-

-

Inguinal hernia

Enema with bark mashed and diluted in water

Pleioceras barteri Baill.

Malan 700

Apocynaceae

KI

-

-

Boil

Topical application

Oedema

Plumbago zeylanica L.

Malan 873

Plumbaginaceae

LP, KI

0.04

0.004

Inguinal hernia

Enema with leaves and roots mashed and diluted in water

Psidium guajava L.

 

Myrtaceae

KI

-

-

Butumanklan

Enema with roots mashed and diluted water

Pterocarpus santalinoides DC.

AD 09, AD 59

Leguminosae

KI

-

-

Malaria

Body smeared with mashed bark

Pycnanthus angolensis (Welw.) Warb.

AD 212

Myristicaceae

LP, KI

0.05

0.022

Haemorrhoids

Enema with bark mashed and diluted in water

Anaemia

Bark decoction drunk

Rauvolfia vomitoria Afzel.

AD 36

Apocynaceae

LP, KI

0.07

0.018

Malaria

Body smeared with mashed roots, enema with roots mashed and diluted in water

Sexual asthenia

Roots soaked in local alcohol and drunk

Inguinal hernia

Enema with mashed roots diluted in water

Rheumatism

Topical application with crushed bark

Rhizophora racemosa G.F.W.Mey.

Malan 806

Rhizophoraceae

KI

-

-

Hydrocephalus

Bathing with bark decoction and body smeared with mashed bark

Ricinodendron heudelotii (Baill.) Pierre ex Heckel

Malan 669

Euphorbiaceae

LP

0.04

0.004

Dysmenorrhoea

Enema with bark mashed and diluted in water

Haemorrhoids

Ricinus communis L.

 

Euphorbiaceae

KI

-

-

Headache

Topical application with mashed bark

Lumbar pain

Massage with warm leaves

Saccharum officinarum L.

 

Poaceae

KI

-

-

Abortion

Enema with leaves mashed and diluted in water

Secamone afzelii (Schultes) K.Schum.

AD 375

Apocynaceae

KI

-

-

Lumbar pain

Enema with leaves mashed and diluted in water

Asthma

Leaves decoction drunk

Smeathmannia pubescens Soland. ex R.Br.

AD 171, Malan 863

Passifloraceae

KI

-

-

Bad breath

Roots as chewing stick

Solanum lycopersicum L.

 

Solanaceae

LP, KI

0.07

0.018

Serious disease of unknown origin

Eye drops with leaf juice

Injury

Topical application with crushed leaves

Contraception

Enema with leaves mashed and diluted in water

Solanum nigrum L.

Malan 1022

Solanaceae

LP

0.04

0.002

Malaria

Enema with leaves mashed and diluted in water

Solenostemon monostachyus (P.Beauv.) Briq

Malan 982

Lamiaceae

KI

-

-

Laryngitis

Leaf juice swallowed

Haedache

Nose drops with leaf juice

Mental illness

Spathodea campanulata P.Beauv.

AD 116

Bignoniaceae

LP

0.05

0.035

Malaria

Bark decoction drunk, taken as enema and for bathing, body smeared with mashed bark

Spondias mombin L.

AD 217

Anacardiaceae

LP

0.04

0.017

Diarrhoea

Enema with leaves mashed and diluted in water

Post-partum care

Strombosia pustulata var. lucida (Léonard) Villiers

Malan 816

Olacaceae

KI

-

-

Bad breath

Roots as chewing stick

Syzygium guineense var. littorale Keay

AD 140, AD 158

Myrtaceae

LP

0.05

0.011

Butumanklan

Enema with bark mashed and diluted in water

Diarrhoea

Stomachache

Tetracera alnifolia Willd.

AD 232

Dilleniaceae

KI

-

-

Inner ear cleanning

Ear drops with sap

Tetrapleura tetraptera (Schumach. & Thonn.) Taub.

AD 143

Leguminosae

KI

-

-

Impotence

Enema with bark mashed and diluted in water

Tiliacora dinklagei Engl.

Malan 884

Menispermaceae

KI

-

-

Sexual asthenia

Roots soaked in local alcohol and drunk

Trema guineensis Schumach. & Thonn.

Malan 676

Cannabaceae

LP

0.04

0.005

Stomachache

Enema with leaves mashed and diluted in water

Pregnancy care

Uvaria afzelii Scott-Elliot

Malan 793, AD 62

Annonaceae

LP, KI

0.22

0.123

Hydrocephalus

Bathing with decoction of roots and leaves, body smeared with leaves and roots mashed

Pregnancy care

Enema with leaves mashed and diluted in water

Colic

Decoction of leaves drunk

Uvaria chamae P.Beauv.

Malan 703, AD 106

Annonaceae

LP, KI

0.09

0.068

Diaper dermatitis

Body smeared with roots mashed

Measles

Topical application with crushed roots and leaves

Chickenpox

Body smeared with mashed roots

Uvariastrum insculptum (Engl. & Diels) Spargue & Hutch.

Malan 912

Annonaceae

KI

-

-

Bad breath

Roots as chewing stick

Sexual asthenia

Roots soaked in local alcohol and drunk

Vernonia amygdalina Delile

AD 131

Compositae

LP, KI

0.11

0.051

Diarrhoea

Enema with leaves mashed and diluted in water

Helminthiasis

Malaria

Bathing with leaves decoction, body smeared with mashed leaves

Chickenpox

Vernonia conferta Benth.

AD 187

Compositae

LP, KI

0.07

0.059

Malaria

Leaves decoction drunk

Vitex oxycuspis Baker

AD 234

Lamiaceae

KI

-

-

Haemorrhoids

Enema with bark mashed and diluted in water

Xylopia acutiflora (Dunal) A.Rich.

Malan 916

Annonaceae

LP

0.04

0.016

Bad breath

Roots as chewing stick

Sexual asthenia

Roots soaked in local alcohol and drunk

Xylopia aethiopica (Dunal) A.Rich.

Malan 711

Annonaceae

LP, KI

0.29

0.225

Post-partum care

Enema with fruits mashed and diluted in water

Zanthoxylum gilletii (De Wild.) Waterman

Malan 742

Rutaceae

LP, KI

0

0.111

Fever attack

Body smeared with mashed bark

Sexual asthenia

Bark soaked in local alcohol and drunk

Laryngitis

Bark decoction drunk

Malaria

Body smeared with mashed bark

Cough

Bark decoction drunk

Colic

Enema with bark mashed and diluted in water

Haemorrhoids

Post-partum care

Frequency of citation (Fq) and Smith’ index (Smith’ S), only for the survey with laypeople (LP). KI: key informant.

All morphological types are represented but with a high prevalence of trees and shrubs (61.8%) followed by lianas (22.8%) and herbaceous species (15.4%). Most of the plants used were native species (85.3%) though few exotic species were recorded (14.7%). These exotic plants included mango tree (Mangifera indica L.), papaya (Carica papaya L.), guava (Psidium guajava L.), plantain (Musa paradisiaca L.), introduced for their edible fruit and neem tree (Azadirachta indica), introduced as ornamental or shade plant. These plants, over time, play an important role in traditional African medicines.

All the plants listed were used for 59 indications (9 exclusively from key informants, 11 from laypeople and 39 from both groups) sorted in 12 categories (Figure 3). The most cited category is the group of infectious and parasitic diseases (84%), followed remotely by the diseases of the genital system, pregnancy and childbirth (46%) and the diseases of the digestive system (34%). Categories of endocrine, nutritional & metabolic diseases and diseases of the respiratory system are the least common with only 7% of the citations.
Figure 3

Diseases categories in relation to medicinal plants used by ehotile people.

Specifically, the most common indications included malaria (82% of citations), sexual weakness (29%), development of pregnancy (23%), dysmenorrhoea (22%) and haemorrhoids (21%).

Analysis of free lists suggested that Ehotile people, in general, has a good knowledge of medicinal plants. The length of the lists ranged from 1 (only one informant) to 38 plants, with an average of 7.1 plants per list. However, frequent lengths were 3 plants per list (25.5% of informants) and 4 per list (18.2% of informants).

Regarding the salience of plants utilized, Harungana madagascariensis Lam. ex Poir. showed the highest Smith’s index (S = 0.38). This plant was widely cited (Fq = 0.53) but with an average rank of 3.9 and a low use-value (UV = 0.02). H. madagascariensis was followed by Alstonia boonei De Wild. (S = 0.32; Fq = 0.35, average rank = 1.8 and UV = 0.02), Ocimum gratissimum L. (S = 0.24; Fq = 0.38, average rank = 3.57 and UV = 0.13) and Xylopia acutiflora (Dunal) A.Rich. (S = 0.22; Fq = 0.29, average rank = 3.88 and UV = 0.04).

Seven types of drugs were listed in very different proportions including leaves (42%), barks (25%), roots and tubers (19%), fruits and seeds (8%), whole plant (4%), inflorescences (1%) and exudates (1%). Anal route using enema bag (33.2%), oral route (27.4%) and body brushing (13.9%) constituted the main administration routes.

Key informant consensus and resources availability

The survey among specialists permitted to collect 92 species of which 27 are specific to this group, for 48 therapeutic indications. These specific plants included Antiaris toxicaria Lesch. Blighia welwitschii (Hiern) Radlk., Chassalia kolly (Schumach.) Hepper, Costus afer Ker Gawl., Diospyros sanza-minika A.Chev., Euadenia trifoliolata (Schumach. & Thonn.) Oliv., Mareya micrantha (Benth.) Müll. Arg., Microgramma owariensis (Desv.) Alston, Vernonia conferta Benth., Plumbago zeylanica L., Ocimum americanum L. (Fq = 1), Icacina mannii Oliv. (Fq = 0.75), Uvaria afzelii G.F. Scott-Elliot (Fq = 0.75), Zanthoxylum gilletii (De Wild.) P.G.Waterman (Fq = 0.63) and Microdesmis keayana J.Léonard (Fq = 0.63).

ICF ranges from 0 to 0.42, implying that there is no real consensus in the medicinal use of plants (Table 2). However, the highest values were recorded for infectious & parasitic diseases (ICF = 0.42), diseases of the blood & circulatory system (ICF = 0.30). The lowest ICF were recorded for diseases of the eye, ear (ICF = 0) & mouth and diseases of the respiratory system (ICF = 0). In the mental and behavioural disorders, only one indication was given for a single plant: Solenostemon monostachyus (P.Beauv.) Briq., used to treat or calm people with mental disorders.
Table 2

Key informant consensus by diseases category

Category

Species

Citation

ICF

Infectious & parasitic diseases

31

53

0.42

Diseases of the blood & circulatory system

20

28

0.30

Wound, diseases of the skin & subcutaneous tissue

14

19

0.28

Diseases of the genital system, pregnancy & childbirth

23

31

0.27

Diseases of the newborn & infant

15

20

0.26

Diseases of the digestive system

14

17

0.19

Impotence & sexual asthenia

8

9

0.13

Diseases of the musculoskeletal system

11

12

0.09

Diseases of the eye, ear & mouth

12

12

0.00

Diseases of the respiratory system

5

5

0.00

Mental & behavioural disorders

1

1

-

ICF: informant consensus factor.

The question of the availability of the resources was discussed with our experts. According to these specialists, excluded the exotic or domesticated plants (14.7%), 4 types for the 85.3% of native medicinal plants can be distinguished.
  • Abundant plants, with organs sought-after easy to collect (44.6%), such as Ageratum conyzoides L., Alchornea cordifolia (Schumach. & Thonn.) Müll.Arg. or Baphia nitida Lodd.

  • Abundant plants, but organs sought-after difficult to harvest or rare (10.2%) such as Tetracera alnifolia Willd. or Kigelia africana (Lam.) Benth.

  • Scarce plants in the region (24.7%) such as Alstonia boonei, Momordica charantia L., Zanthoxylum gilletii (Figure 4).
    Figure 4

    Harvesting stem bark of zanthoxylum gilletii one the ehotile major medicinal plants. This tree is becoming scarce in ehotile land and the stem bark difficult to harvest. Note the numerous torn stems at the base of the tree, due to frequent harvest.

  • Endangered plants in the region, rarely found in their natural habitat (5.8%) such as Garcinia kola Heckel, Khaya ivorensis A.Chev. or Picralima nitida (Stapf) T.Durand & H.Durand.

According to this information, 59.3% of medicinal plants used were easily accessible (44.6% of native abundant species and 14.7 of exotic domesticated or cultivated species), while 5.8% were hardly ever found in the region. About the categories of diseases, nearly 80% of plants used in the treatment of wounds and skin infections were easy to find, while 15% of species used as sexual stimulants (Garcinia kola and Khaya ivorensis) were very rare in the study area.

Concerning the used parts (Table 3), in the category of “abundant plants, with organs sought-after easy to collect”, leaves constituted 53.6% of parts used, while the roots were highly sought (50%) in the category of “endangered plants in the region, rarely found in their natural habitat”.
Table 3

Proportion of medicinal plants part used in relation to plants availability type

Availability type

Proportion (%) of parts used

Leaf

Bark

Root & tuber

Fruit & seed

Exudate

Whole plant

Abundant plants & part used easy to collect

53.6

16.1

19.6

1.8

1.8

7.1

Abundant plants. but part used difficult to harvest or rare

20.0

40.0

13.3

13.3

6.7

6.7

Scarce plants in the region

19.0

61.9

14.3

4.8

0.0

0.0

Endangered plants in the region. rarely found in their natural habitat

0.0

25.0

50.0

25.0

0.0

0.0

Exotic domesticated or cultivated plants

77.8

14.8

7.4

0.0

0.0

0.0

Discussion

Most of ethnobotanical studies in West Africa are clearly marked as concerning the use of plants as medicine or as food [7]. Regarding medicinal uses, several works have been carried out about the treatment of several microbial infections [32,33], a range of tropical endemic diseases including malaria [34-38] as well as diabetes [39,40] and diverse infections [41].

This propensity of African ethnobotanists to medicinal plants reflects the fact that the study of plants used traditionally as medicines is an interesting discipline because of the possibility to find new drugs [42]. This has prompted many research teams to carry out studies on plants used in Africa by traditional healers against diseases.

Furthermore, these studies have the laudable aim of creating databases on traditional knowledge of plants use, although they remain disparate. Nevertheless, this abundant literature shows that despite the advances in Western medicine, African traditional medicine has gained renewed interest in the health care services throughout the continent. This could probably be due to the rapidly increasing awareness of the potential and curative abilities of alternative medicines, especially from the use of medicinal plants [42], as well as the inadequate access to Western medicine and physicians and the high cost for Western drugs [3].

This is the situation around the Aby Lagoon. Indeed, the results of this study showed that Ehotile people use plants in traditional medicinal practices. Globally, they know and use the handy plants as first treatment of common ailments. However, they also often resort to healer’s services. These healers are more or less known for specific field including reproductive health, rheumatism, and mental health. This specialization can justify the low values of ICF (<0.5). Indications of some plants, such as Harungana madagascariensis, Ocimum gratissimum, are widely shared, but information on plants and practices related to diseases specifically treated by healers is well protected. Thus, the recourse to these specialists is generally based on their area of recognized competence.

Though, as noted, the main purpose of these recourses remains what we called “African-disorders”: Asema, elokposan or butumanklan. Asema, for example, is a child disease manifested by an under nutrition. This condition would be due to “impurities” related to the resumption of sexual activity of the mother before her child is strengthened. This fact elicits a physical degradation of the child followed by frequent diarrhoea and signs of emotional deprivation. This disease is well known in sub-Saharan Africa. Such signs, related to the same cause, have been described in the Baka pygmies in Cameroon [43] and the Democratic Republic of Congo [44]. So these authors classified them as “African diseases” maintaining the local name (Buse in DRC) or assigning an approximate equivalence (“child-cross” in Cameroon).

According to the description of the signs, the elokposan would be the Pott’s disease that is a bone location of tuberculosis inducing developments of a hump. However, according to popular belief, elokposan is an occult disease. Thus, to protect themselves against it, wooden statues, also called elokposan, representing hunchbacks were suspended under the roofs on the side of the street.

Butumanklan, on the other hand literally means “anal wounds”. It would be the relaxation of the muscles of the rectum. A patient suffering from this illness struggles to contain the bowel gas.

Plants indicated for the treatment of these diseases are certainly well known, but malaria and its associated symptoms (fever, convulsion, jaundice) were most cited. In fact, 21 species (18% of all medicinal plants) are known for their use in the treatment of malaria. Among these species six are known only for this single indication: Alstonia boonei, Azadirachta indica A.Juss., Bambusa vulgaris Schard, Harungana madagascariensis, Spathodea campanulata P.Beauv. and Vernonia conferta. These species, which recorded a low use-value (UV = 0.02) are in fact highly specialized in the treatment of a single disease. This poses the problem of interpretation of use-value in the case of studies in medicinal plants. If it is true that a high use-value of a plant indicates its importance within a community [22,30], nevertheless, a UV close to 0 could indicate a high degree of specialization for a plant rather than a low use, when the frequency of citation of this plant is important. That is the case of Harungana madagascariensis which is widely known by Ehotile people as the anti-malarial plant.

This plant is used by other people of Côte d'Ivoire and Africa for the same indications, certainly because of its bright orange yellow latex (doctrine of signatures). It is used in the composition of many mixtures against jaundice in Côte d’Ivoire [11], Cameroon [43], southern Nigeria and Congo [45]. The stem bark contains several compounds such as anthracene, kenganone and kengathranol, anthronoïdes (harunmadagascarin A and B) having an important antioxidant activity [46]. Pharmacological works have confirmed the important traditional use of this plant in the treatment of malaria. Indeed, the stem bark extract exhibited significant anti-protozoan effects against Trichomonas and Plasmodium both in vivo and in vitro [47] and also exhibit anti-anaemic activity, and it’s known that anaemia is a universal feature of malaria [48].

In contrast to this species highly specialized, some plants recorded higher use-values (UV > 0.1). These plants included Zanthoxylum gilletii (UV = 0.15; 8 indications), Ocimum gratissimum (UV = 0.13; 7 indications), Eclipta prostrata (UV = 0.11; 6 indications) and Paullinia pinnata L. (UV = 0.2, 6 indications). Considered as panaceas, these species were variously used by the Ehotile. For example, Ocimum gratissimum is used for first intension in the treatment of several diseases (Convulsion, dysmenorrhoea, infant diarrhoea, gastritis, headaches). This plant is widely used in Côte d’Ivoire [12] and elsewhere in sub-Saharan Africa. For example, 7 indications for this plant are known in Ghana [49] and 11 indications in the south-eastern Nigeria [3]. Zanthoxylum gilletii is also widely known in Côte d’Ivoire for the diversity of its therapeutic indications [11,35]. The use of Paullinia pinnata in the treatment of malaria, haemorrhoids and sexual asthenia is not specific to Ehotile. In Benin, the plant is used to treat malaria and haemorrhoids, while in Mali and Togo, it is used against sexual asthenia. It is known now that antioxidant activity of the phenolic compounds contained in roots and leaves of this plant is the basis of its efficiency in the treatment of erectile dysfunction [50].

Other plants used by Ehotile are also known elsewhere or for similar purposes or for other pathologies. We will mention the example of Icacina mannii, Cassia occidentalis L., Baphia nitida, Phyllanthus amarus Schumach. & Thonn., Picralima nitida and Momordica charantia.

The use of Icacina mannii against sexual asthenia seems not widespread. However, its use in the treatment of dysmenorrhoea and infertility in women (two conditions linked according to local experts) was raised in West Africa [51].

The leaves of Cassia occidentalis are used in the treatment of malaria in Ghana [37] and Nigeria [36], as used by Ehotile and phytochemical studies have shown the anti-malarial properties of this plant [52]. As used by Ehotile, the leaf juice of Baphia nitida is applied against parasitic skin diseases [53], but the use of this plant to cure lumbar pains was not found elsewhere. Phyllanthus amarus is widely used as a medicinal plant and as known by Ehotile. This plant is taken to facilitate childbirth and it is considered as a good tonic, diuretic and antipyretic [54].

Therapeutic Indications of Picralima nitida, widely known by Ehotile in the treatment of inguinal hernia, are reported in Côte d’Ivoire [11]. The akuammine, alkaloid abundant in the seeds can explain analgesic and relaxant action of this plant. Indeed, pharmacological studies revealed that the extract or isolated compounds from this species have analgesic, anti-inflammatory, hypoglyceamic, hypotensive, antiplasmodial, antimicrobial, antiulcer and antitumorigenic activities [55]. The anti-malarial use of Momordica charantia is widely known. Furthermore, in vitro anti-plasmodial activity has been demonstrated [56].

Finally, most of plants used as medicine by Ehotile are known by other people of Côte d’Ivoire and Africa. Indeed, 72 i.e. 62% of medicinal species identified are listed in the 304 highly pharmaceutical plants of Côte d’Ivoire [12]. However, some uses in traditional medicines of certain plants, as well as some therapeutic indications seem exclusive to Ehotile culture.

For example, the roots of Uvaria afzelii are employed in all medicinal preparations against hydrocephalus. Yet, this indication has not been reported and moreover, this disease is very rarely mentioned in the literature. Similarly, no mention of the use of Xylopia acutiflora’s roots was found out. Nevertheless, these roots are widely known by Ehotile as sexual stimulants or as chewing sticks. Xylopia acutiflora is very known and appreciated by Ehotile women as chewing sticks as well for the pleasant minty sensation provided and the flexibility of the fibers obtained after chewing.

One of the issues raised in this survey is the availability of medicinal resources. As highlighted by various authors [3,4], access to medicinal resources is an acute problem in Africa. Loss of natural vegetation, due to various causes, is also a major factor in the erosion of traditional knowledge [57]. Indeed, it is always considered that the resources of the deep forest are more effective than ruderal or introduced species. For example, Tetracera alnifolia abounds, but mature plants containing the sought exudate are only found in old marshland, that are scarce and difficult to access.

Yet, despite the deterioration of natural habitats, the use of medicinal plants is still alive among Ehotile. This situation of seemingly low-impact of environmental degradation on medicinal practices was also observed in Zambia [14]. However, we believe that this may be largely due to the fact that the plants commonly used are often on hand or in fallow or neighboring plantations.

Conversely, exploitation for medicinal purposes of certain plant species led to their scarcity or their disappearance [57]. The plant parts used and the way in which medicinal products are harvested also affect availability of the resources. Medicinal products, including barks, roots, and exudates, are widely used, but little is known about the sustainability of harvesting strategies currently employed [57]. Particularly vulnerable are those species occurring at low densities, those whose roots are harvested [2,57]. In our case, more than 50% of the dwindling species were sought for their roots, which should increase the pressure on these species.

Also vulnerable are those species whose bark or oil is extracted unsustainably [2] Harungana madagascariensis, Zanthoxylum gilletii and Icacina mannii are an illustration of unsustainable extraction, in our case. Harungana madagascariensis, as mentioned, is widely used as an anti-malarial, by specialized healers and housewives. Unfortunately, the stem bark, is easily removed and wholly extracted as well as leaves, leading to loss of the tree. According to the healers, currently, the plant only exists in the vicinity of a few marshy formations. Zanthoxylum gilletii is similar case but this species owes its survival to its resilience and its height. Icacina mannii is prized for its tuber, deemed effective against haemorrhoids and impotence. The collection of the whole tuber prevents any possibility of regeneration.

However, as noted elsewhere [57], the ecology of even the most widely used species is poorly understood and the impact of medicinal plant harvesting practices on the availability of resources are not known as well. Nevertheless, the relative impacts of harvesting medicinal plants are insignificant when compared with the impacts of deforestation [57].

Conclusions

The study of medicinal plants in Côte d’Ivoire covers many areas ranging from simple monographs to phytochemical and pharmacological studies. Few works have tried to estimate the knowledge about plants by a quantitative approach. This way of doing ethnobotany is in its early days in sub-Saharan Africa and should experience strong changes like what is done in Europe, Brazil and North America for example.

The study of the use of medicinal plants in Ehotile was interesting given their lifestyle (fishing) and especially the degradation of their environment.

The disappearance of natural formations in Ehotile land could indicate a low knowledge and use of medicinal plants by Ehotile. Rather, medicinal plants play an important role in the daily life of Ehotile thereby coming as complementary and alternative to modern health system. 123 plants were inventoried. They are used, in addition to medical prescriptions or exclusively, for treating several ailments most common of which are; malaria, sexual asthenia, hydrocephalus, pregnancy disorders and dysmenorrhea. Some of these plants are known for only one indication whereas, others have multiple usages.

The information was collected from two informants groups: the laypeople and key informants. Key informants helped us to confirm much of the information received from laypeople. The Informant Consensus Factor was only applied to this group and it was confirmed that they were, each highly specialized in the treatment of various diseases. With these local experts, the availability of identified plants was also defined. Some medicinal plants were easily accessible, whereas, others were scarce or no longer found in the region. It is feared that the scarcity of plants is a precursor to the disappearance of the rich knowledge and practices associated with them.

Two other aspects of this study are ongoing and should allow, with key informants, to specify the extent of the impact of environmental degradation on Ehotile medicinal practices firstly, and secondly to estimate the effect of medicinal plants harvesting on the availability of the most used species.

Declarations

Acknowledgements

We are very grateful to Ms. Gloria K. BORONA, kagosi MWAMULOWE for the time they spent in reviewing the manuscript and for their valuable suggestions. We would also like to thank people of mélékoukro, akounougbé, assomlan and etuoboué for their openness and warm welcome.

Authors’ Affiliations

(1)
UFR des Sciences de la Nature, Université Nangui Abrogoua
(2)
Institut Botanique Aké-Assi d’Andokoi

References

  1. Fasihuddin BA, Ghazally I. Medicinal plants used by Kadazandusun communities around Crocker Range. ASEAN Rev Environ Conserv (ARBEC). 2003;1:1–10.Google Scholar
  2. Cunningham AB. Setting priorities at the interface between conservation and primary health care, People and Plants Working Paper 1. Paris: UNESCO; 1993.Google Scholar
  3. Okafor J, Ham R. Identification, utilisation et conservation des plantes médicinales dans le Sud-est du Nigeria. Thèmes biodiv Afr. 1999;3:1–8.Google Scholar
  4. Meunier Q, Bellefontaine R, Boffa JM. Le drageonnage pour la régénération d’espèces médicinales en Afrique tropicale : cas du Spathodea campanulata en Ouganda. VertigO. 2006;7(2):1–6.Google Scholar
  5. Balick MJ, Cox PA. Plants, people, and culture, The Science of Ethnobotany. New York, USA: Scientific American Library; 1996.Google Scholar
  6. Alexiades MN. Ethnobotany in the Third Millennium: expectations and unresolved issues. Delpinoa. 2003;45:15–28.Google Scholar
  7. Dounias E, Rodrigues W, Petit C. Review of ethnobotanical literature for Central and West Africa. Bul Afric Ethnob Net. 2000;2:5–117.Google Scholar
  8. Visser LE. Plantes médicinales de la Côte d’Ivoire. Une étude ethnobotanique des usages médicaux et comestibles des plantes sauvages par les Ando de la Côte d’Ivoire (Afrique occidentale). Wageningen: Mededelingen Landbouwhogeschool; 1975.Google Scholar
  9. Lorougnon G. La médecine traditionnelle africaine: plantes et pharmacopée chez les Bété de la région de Daloa (Côte d'Ivoire). Abidjan, Côte d’Ivoire: Université Abidjan; 1993.Google Scholar
  10. N’guessan K. Les plantes médicinales et pratiques médicales traditionnelles chez les peuples Abbey et Krobou du Département d’Agboville (Côte d'Ivoire). PhD thesis. Abidjan: Université FHB Cocody, UFR Bioscience; 2008.Google Scholar
  11. Bouquet A, Debray M. Plantes médicinales de la Côte d’Ivoire. Paris: Travaux et documents de l’ORSTOM; 1974.Google Scholar
  12. Adjanohoun E, Aké Assi L. Contribution au recensement des plantes médicinales de Côte d’Ivoire. Abidjan: CNF; 1979.Google Scholar
  13. World Health Organization. Côte d’Ivoire: Health profile, 2010. http://www.afro.who.int/index.php?option=com_docman&task=doc_download&gid=7117&Itemid=2593.
  14. Adjemian M. Medicine from the forest: the impact of deforestation on medicinal plant availability and use in the Bilili Game Management Area, Southern Zambia. Thesis, McGill University, 2008.Google Scholar
  15. Malan DF. Utilisations traditionnelles des plantes et perspective de cogestion des aires protégées de Côte d'Ivoire: cas du Parc National des Iles Ehotilé (littoral est de la Côte d’Ivoire), PhD Thesis. Abidjan: University of Abobo-Adjamé, Nature Science Department; 2008.Google Scholar
  16. Malan DF, Aké Assi L, Tra Bi FH, Neuba D. Diversité floristique du Parc National des Iles Ehotilé (Littoral est de la Côte d’Ivoire). Bois For Trop. 2007;292(2):49–58.Google Scholar
  17. Lucena RFP, Lima E, Albuquerque UP. Does the local availability of woody Caatinga plants (Northeastern Brazil) explain their use value? Econ Bot. 2007;61(4):347–61.View ArticleGoogle Scholar
  18. Guillaumet J-L, Adjanohoun E. La végétation. In: Avenard JM, Eldin M, Girard G, Sircoulon J, Touchebeuf P, Gillaumet JL, Adjanohoun E, Perraud A, editors. Le milieu naturel de la Côte d'Ivoire. Paris: ORSTOM; 1971.Google Scholar
  19. Perrot CH. Les Eotilé de Côte d’Ivoire aux XVIIIe et XIXe siècles. Pouvoir lignager et religion. Paris: Publications de la Sorbonne; 2008.Google Scholar
  20. Philips O, Gentry A. The useful woody plants of Tambopata, Peru: I. Statistical hypothesis tests with a new quantitative technique. Econ Bot. 1993;47:s16.Google Scholar
  21. Hoffman B, Gallaher T. Importance Indices in Ethnobotany. Ethnobot Res Appl. 2007;5:201–18.Google Scholar
  22. Albuquerque UP, Lucena RFP, Monteiro JM, Florentino ATN, Almeida CFCBR. Evaluating two quantitative ethnobotanical techniques. Ethnobot Res Appl. 2006;4:51–60.Google Scholar
  23. Tardío J, Pardo-de-Santayana M. Cultural importance Indices: a comparative analysis based on the useful wild plants of Southern Cantabria (Northern Spain). Econ Bot. 2008;62(1):24–39.View ArticleGoogle Scholar
  24. Quinlan M. Considerations for collecting freelists in the field: examples from ethobotany. Field Methods. 2005;17(3):219–34.View ArticleGoogle Scholar
  25. Schrauf RW, Sanchez J. Using freelisting to identify, assess, and characterize age differences in shared cultural domains. Psychol Sci Soc Sci. 2008;63:385–93.Google Scholar
  26. Smith JJ, Borgatti SP. Salience counts—and so does accuracy: correcting and updating a measure for free-list-item salience. J Ling Anthropol. 1998;7(2):208–9.View ArticleGoogle Scholar
  27. Sutrop U. List task and a cognitive salience index. Field Methods. 2001;13(3):263–76.View ArticleGoogle Scholar
  28. Rossato SC, Leitão-Filho H, Begossi A. Ethnobotany of caiçaras of the Atlantic Forest Coast (Brasil). Econ Bot. 1999;53:387–95.View ArticleGoogle Scholar
  29. Heinrich M, Ankli A, Frei B, Weimann C, Sticher O. Medicinal plants in Mexico: Healers’ consensus and cultural importance. Soc Sci Med. 1998;47:1863–75.View ArticleGoogle Scholar
  30. Gazzaneo LRS, Lucena RFP D, Albuquerque UP D. Knowledge and use of medicinal plants by local specialists in a region of Atlantic Forest in the state of Pernambuco (Northeastern Brazil). J Ethnobiol Ethnomed. 2005;1:9.View ArticlePubMed CentralPubMedGoogle Scholar
  31. World Health Organization. International statistical classification of diseases and related health problems. Volume 2, Instruction manual. 2010 Edition. Geneva, Switzerland: WHO Library Cataloguing-in-Publication Data; 2011.Google Scholar
  32. Ogbadoyi EO, Abdulganiy AO, Adama TZ, Okogun JI. In vivo trypanocidal activity of Annona senegalensis Pers. leaf extract against Trypannosoma brucei brucei. J Ethnopharmacol. 2007;112(1):85–9.View ArticlePubMedGoogle Scholar
  33. Tra Bi FH, Koné MW, Kouamé NF. Antifungal activity of Erigeron floribundus (Asteraceae) from Côte d’Ivoire, West Africa. Trop J Pharm Res. 2008;7(2):975–9.View ArticleGoogle Scholar
  34. Ajaiyeoba E, Falade M, Ogbole O, Okpako L, Akinboye D. In vivo antimalarial and cytotoxic properties of Annona senegalensis extract. Afr J Trad CAM. 2006;3(1):137–41.Google Scholar
  35. Zirihi GN, Datte JY, Kra-Adou KM, Grellier P. Phytochemical and pharmacological studies of alcoholic extract of Fagara macrophylla (Oliv) Engl(Rutaceae):chemical structure of active compound inducing antipaludic activity. J Chinese Clin Med. 2007;2(4):205–10.Google Scholar
  36. Singh S, Singh R. Herbal medicinal treatment of Malaria in Aliero Local Government Area, Kebbi, Nigeria. J Med Plants Stud. 2014;2(2):117–26.Google Scholar
  37. Asase A, Oteng-Yeboah AA, Odamtten GT, Simmonds MSJ. Ethnobotanical study of some Ghanaian anti-malarial plants. J Ethnopharmacol. 2005;99:273–9.View ArticlePubMedGoogle Scholar
  38. Ancolio C, Azas N, Mahiou V, Ollivier E, Di-Giorgio C, Keita A. Antimalarial activity of extracts and alkaloids isolated from six plants used in traditional medicine in Mali and Sao Tome. Phytother Res. 2002;16(7):646–9.View ArticlePubMedGoogle Scholar
  39. Ojewole JA. Hypoglycaemic effect of Clausena anisata (Willd) Hook methanolic root extract in rats. J Ethnopharmacol. 2002;81:231–7.View ArticlePubMedGoogle Scholar
  40. Ugochukwu NH, Babady NE. Antioxidant effects of Gongronema latifolium in hepatocytes of rat models of non-insulin dependent diabetes mellitus. Fitoterapia. 2002;73:612–8.View ArticlePubMedGoogle Scholar
  41. Yapo FA, Yapi FH, Ahiboh H, Hauhouot-Attounbre M-L, Guédé NZ, Djaman JA, et al. Immunomodulatory effect of the aqueous extract of Erigeron floribundus(Kunth) Sch Beep (Asteraceae) leaf in Rabbits. Trop J Pharm Res. 2011;10(2):187–93.View ArticleGoogle Scholar
  42. Lydia L, Lifongo LL, Simoben CV, Ntie-Kang F, Babiaka SB, Judson PN. A bioactivity versus ethnobotanical survey of medicinal plants from Nigeria. West Africa Nat Prod Bioprospect. 2014;4:1–19.View ArticleGoogle Scholar
  43. Betti JL. An ethnobotanical study of medicinal plants among the Baka Pygmies in the Dja Biosphere Reserve. Cameroon Afr Study Monogr. 2004;25(1):1–27.Google Scholar
  44. Mukohya V, Kalau JM, Mutambwa M, Kakudji A. Appréhension de la maladie et dimension symbolique du traitement. In: Petit P, Mukohya V, editors. Bunganga Ya Mici, Guérisseurs et plantes médicinales à Lubumbashi. Lubumbashi: Université de Lubumbashi, Observatoire du changement urbain, CUD; 2004. p. 63–76.Google Scholar
  45. Adjanohoun E, Ahyi MRA, Aké Assi L, Dramane K, Elewude JA, Fadoju SO, et al. Contribution to ethnobotanical and floristic studies in Western Nigeria. Paris: CSTR/OUA; 1991.Google Scholar
  46. Kouam SF, Ngadjui BT, Krohn K, Wafo P, Ajaz A, Choudhary MI. Prenylated anthronoid antioxidants from the stem bark of Harungana madagascariensis. Phytochemistry. 2005;66(10):1174–9.View ArticlePubMedGoogle Scholar
  47. Iwalewa EO, Omisore NO, Adewunmi CO, Gbolade AA, Ademowo OG, Nneji C, et al. Anti-protozoan activities of Harungana madagascariensis stem bark extract on trichomonads and malaria. J Ethnopharmacol. 2008;117(3):507–11.View ArticlePubMedGoogle Scholar
  48. Iwalewa EO, Omisore NO, Daniyan OM, Adewunmi CO, Taiwo BJ, Fatokun OA, et al. Elemental compositions and anti-anemic property of Harungana madagascariensis stem bark. Bangladesh J Pharmacol. 2009;4:115–21.View ArticleGoogle Scholar
  49. Agbovie T, Amponsah K, Crentsil OR, Dennis F, Odamtten GT, Ofusohene-Djan W. Conservation and sustainable use of medicinal plants in Ghana: ethnobotanical survey. Cambridge UK: UNEP-WCMC; 2002.Google Scholar
  50. Zamblé A, Carpentier M, Kandoussi A, Sahpaz S, Petrault O, Ouk T, et al. Paullinia pinnata extracts rich in polyphenols promote vascular relaxation via endothelium-dependent mechanisms. J Cardiovasc Pharmacol. 2006;47(4):599–608.View ArticlePubMedGoogle Scholar
  51. Burkill HM. The useful plants of west tropical Africa, vol. 2. 2nd ed. Kew, Richmond, UK: Families E-I, Royal Botanic Gardens; 1994.Google Scholar
  52. Tona L, Cimanga RK, Mesia K, Musuamba CT, De Bruyne T, Apers S. In vitro antiplasmodial activity of extracts and fractions from seven medicinal plants used in the Democratic Republic of Congo. J Ethnopharmacol. 2004;93:27–32.View ArticlePubMedGoogle Scholar
  53. Cardon D, Jansen PCM. Baphia nitida Lodd. In: Jansen PCM, Cardon D, editors. PROTA 3: Dyes and tannins [CD-Rom]. Wageningen, Netherlands: PROTA; 2005.Google Scholar
  54. Oudhia P. Phyllanthus amarus Schumach. & Thonn. [Internet]. In: GH, Gurib-Fakim A, editors. Record from Protabase Schmelzer. Wageningen, Netherlands: PROTA; 2008.Google Scholar
  55. Erharuyi O, Falodun A, Langer P. Medicinal uses, phytochemistry and pharmacology of Picralima nitida (Apocynaceae) in tropical diseases: a review. Asian Pac J Trop Med. 2014;7(1):1–8.View ArticlePubMedGoogle Scholar
  56. Yousif SA. In vitro screening of antiplasmodium activity of momordica charantia. J Nat Resour Environ Stu. 2014;2(3):29–33.Google Scholar
  57. Shanley P, Luz L. The impacts of forest degradation on medicinal plant use and implications for health care in Eastern Amazonia. Bioscience. 2003;53(6):573–84.View ArticleGoogle Scholar

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