Ethnopharmacological survey among migrants living in the Southeast Atlantic Forest of Diadema, São Paulo, Brazil

Daniel Garcia; Marcus Vinicius Domingues; Eliana Rodrigues

doi:10.1186/1746-4269-6-29

Research

Open Access

Ethnopharmacological survey among migrants living in the Southeast Atlantic Forest of Diadema, São Paulo, Brazil

Daniel Garcia¹Email author,
Marcus Vinicius Domingues¹ and
Eliana Rodrigues²

Journal of Ethnobiology and Ethnomedicine20106:29

https://doi.org/10.1186/1746-4269-6-29

Received: 24 June 2010

Accepted: 29 October 2010

Published: 29 October 2010

Abstract

Background

Understanding how people of diverse cultural backgrounds have traditionally used plants and animals as medicinal substances during displacements is one of the most important objectives of ethnopharmacological studies. An ethnopharmacological survey conducted among migrants living in the Southeast Atlantic Forest remnants (Diadema, São Paulo, Brazil) is presented herein.

Methods

Ethnographical methods were used to select and interview the migrants, and botanical and zoological techniques were employed to collect the indicated resources.

Results

We interviewed five migrants who described knowledge on 12 animals and 85 plants. Only 78 plants were present in Diadema, they belong to 37 taxonomic families; 68 were used exclusively for medicinal purposes, whereas 10 were reported to be toxic and/or presented some restriction of use. These taxa were grouped into 12 therapeutic categories (e.g., gastrointestinal disturbances, inflammatory processes or respiratory problems) based on the 41 individual complaints cited by the migrants. While the twelve animal species were used by the migrants to treat nine complaints; these were divided into six categories, the largest of which related to respiratory problems. None of the animal species and only 57 of the 78 plant species analysed in the present study were previously reported in the pharmacological literature; the popular knowledge concurred with academic findings for 30 of the plants. The seven plants [Impatiens hawkeri W. Bull., Artemisia canphorata Vill., Equisetum arvensis L., Senna pendula (Humb. & Bonpl. ex Willd.) H.S. Irwin & Barneby, Zea mays L., Fevillea passiflora Vell. and Croton fuscescens Spreng)] and the two animals (Atta sexdens and Periplaneta americana) that showed maintenance of use among migrants during their displacement in Brazilian territory, have not been studied by pharmacologists yet.

Conclusions

Thus, they should be highlighted and focused in further pharmacology and phytochemical studies, since the persistence of their uses can be indicative of bioactive potentials.

Keywords

Bioactive PotentialAchillea MillefoliumAllopathic MedicineTaxonomic FamilyEquisetum Arvensis

Background

Cultural mixing mediated by the migration of people around the world has generated increasing interest in recent years within the field of ethnopharmacology [1]. Medicinal plants have been used by human societies throughout history, also across geographical barriers [2]. The continuous use of certain plants and animals for medicinal purposes over time reflects their potential therapeutic value. Such substances become even more promising when they are persistently used by migrating human groups despite the considerable distances travelled and the consequent exposure to different cultures and vegetal resources. Numerous studies have collected information on medicinal plants from ethnic groups who migrated from Mexico to the U.S.A. [3, 4]; from Haiti to Cuba [5]; from Africa to South America [6]; from Africa to Brazil [7]; from Colombia to London [8]; from Suriname to the Netherlands [9]; from Albania to southern Italy [10, 11]; from Germany to eastern Italy [12]; and from Europe and Africa to eastern Cuba [1, 13]. However, few studies have focused on migration within a country, such as that described by Rodrigues et al. [14] regarding migrants from northeastern Brazil who currently occupy the southeast.

Brazil offers a favourable environment for studies focused on migration and medicinal plants/animals because it possesses a large area of 8,514,876.599 km² [15] and boasts high indices of cultural and biological diversity. Brazil is inhabited by rural and urban populations of 232 indigenous ethnic groups [16], 1,342 Quilombola groups (descendants of Afro-Brazilian people) [17], and mestizo groups derived from the miscegenation of Indian, Black, European and Asiatic people. Brazil also houses 55,000 species of higher plants [18] and almost 7% of global animal diversity was described (ca. 100,000 out of 1.5 million), though some estimates suggest that this number is significantly higher [19]. Migration between regions of this country encourages contact with the rich biological and cultural diversity and allows interpersonal interactions that contribute to the transformation of local medicinal therapies.

According to Simões and Lino [20], the original Atlantic Forest covered approximately 1.3 million km², spanning 17 Brazilian states from south to northeast; however, it currently covers only 14 states, and its area has been reduced to 65,000 km². Despite considerable fragmentation, the Atlantic Forest still contains more than 20,000 plant species (8,000 endemic) and 1,361 animal species (567 endemic). It is the richest forest in the world in wood plants per unit area; the southern Bahia, for example, holds a record of 454 different species/ha [21].

The objective of this study was to perform an ethnopharmacological survey among migrants from northeastern and southeastern Brazil who currently live in Atlantic Forest remnants in the municipality of Diadema (São Paulo state, southeastern Brazil). We attempted to understand how the medicinal use of certain plant and animal changed as a result of the migrants' contact with new therapies, diseases and natural resources found in Diadema. These findings were classified as either: maintenance, replacement, incorporation or discontinuation of plants/animals use.

These objectives are in agreement with several stated goals of ethnopharmacology, namely, to investigate how migration can influence knowledge of medicinal plants/animals, the extent to which displaced people incorporate new species into their therapeutic methods, and, in particular, why individuals sometimes persistently adhere to old customs, before or even after they are exposed to new possibilities. Therefore, we adopt the hypothesis that the use of plants/animals as medicines is influenced by migratory movements, and access to natural resources available in the municipality of Diadema.

Methodology

Fieldwork

One of the authors (D. Garcia) spent 14 months (September 2007 to November 2008) in the municipality of Diadema, São Paulo, SP, Brazil (23°41'10"S, 46°37'22"W) (Figure 1), selecting, observing and interviewing migrants living in the Atlantic Forest remnants. Diadema is located 16 kilometres from the capital São Paulo, covers an area of 30.65 km², and is occupied by 394.266 inhabitants [15], most of whom are migrants from other regions of Brazil. The municipality has a literacy rate of 6.8% [22], and its Human Development Index is 0.79 [23]. The Atlantic Forest remnants found in this city are rich in plants that are either native or introduced by the influence of those migrants present both in urban and rural areas.

Figure 1
**Location of the Municipality of Diadema, in São Paulo state, southeastern Brazil (black square)**. Interviewees' migration from their cities of origin to Diadema, being PE (Pernambuco state), SE (Sergipe), MG (Minas Gerais) and SP (São Paulo), and the distance of the displacement in each case (in Km).

Migrants who had relevant knowledge regarding the use of plants and animals for medicinal purposes were selected for interviews following the purposive sampling method [24]. Thus, we sought information about the presence of migrants from herb traders, health care professionals, and some local prayer-makers. According to Bernard [24], this sampling is also known as judgment sampling, utilized during qualitative research in particular in those populations that are difficult to be localized, the researcher selects interviewees based on their trial that they meet the criteria for the study of the phenomenon of interest. After identifying potential interviewees, the researcher visited them to determine whether they did indeed possess knowledge on medicinal plants and whether they wanted to take part in this study. The ethnopharmacological study was approved by the Ethics Committee of Universidade Federal de São Paulo (UNIFESP's Ethics Committee on Research 1969/07) and Conselho de Gestão do Patrimônio Genético (No. 02000.001 049/2008-71). The interviewees also signed consent forms granting permission to access their knowledge and collect botanical and zoological material.

Personal and ethnopharmacological data from the interviewees were obtained through informal and semi-structured interviews [24] that addressed the following topics: personal details and migration history (name, sex, age, religion, marital status, place of birth, migration, main occupation, grade of schooling) as well as ethnopharmacology (name of natural resource, use, part used, formula, route of administration, contraindications, dosages, restrictions of use). The author (D. Garcia) has visited each interviewee at least 12 times, in order to fill in the forms mentioned above, as well as to understand their processes of acquiring knowledge in depth.

Each medicinal plant was collected in the presence of the person who described it during the interviews, in accordance with the methods suggested by Lipp [25]. The plants' scientific names were determined by specialists from the Instituto de Botânica do Estado de São Paulo (IB), and vouchers were deposited at the Herbário Municipal de São Paulo (PMSP). The animals collected were placed in glass vials containing 70% ethyl alcohol, and their subsequent identification and deposit were performed by zoologists from the Museum of Zoology, Universidade de São Paulo (MZUSP) and the Bioscience Institute from Universidade de São Paulo (IB-USP).

When interviewees cited plants and animals that were used only in their cities of origin, i.e., not available in Diadema, photos from the literature and other information (e.g., popular name, habits and habitat) were used to identify them to at least the genus level. These organisms are marked with asterisks throughout the text and in Table 1. The Herpetofauna of the Northeast Atlantic Forest [26] and The Herpetofauna of Caatingas and Altitudes Areas of the Brazilian Northeast [27] were used as identification guides. For plants, we also consulted Medicinal Plants in Brazil - Native and Exotic [28].

Table 1

The 12 animals indicated by migrant PE2, their popular and scientific names, complaints (part used), formula and route of administration.

Popular name ^{dynamic of use}	Scientific name or only genus (family/class) Voucher	Complaint (part used) - formula - route of administration
1- Snake (cobra)°	Chironius sp., Liophs sp. (Colubridae/Reptilia)* or Bothops sp. (Viperidae/Reptilia)*	Bronchitis (skin) - powder - ingested
2- Rattlesnake (cascavel)°	Crotalus cf. durissus L. (Viperidae/Reptilia)*	Back pain (fat) - in natura - ingested
		Bronchitis (rattle) - tie it in the neck - topic
		Heart problems (tooth) - put it in the pocket of shirt
3- Cururu frog (sapo-cururu)°	Rhinella sp. (Bufonidae/Amphibia)*	Cancer of skin (whole animal) - in natura: tie it on the cancer for some time each day - topic
4- Alligator (jacaré)°	Crocodilus sp., Cayman sp. or Paleosuchus sp. (Alligatoridae/Reptilia)*	Apoplexy (skin) - syrup of skin powder - ingested
		Bronchitis (bone) - powder - ingested
5- Turtle (tartaruga)°	Geochelone sp. (Testudinidae/Reptilia)*	Bronchitis and asthma - (turtleshell) - powder - ingested
6- Capybara (capivara)°	Hydrochoerus cf. hydrochaeris L. (Hydrochaeridae/Mammalia)*	Bronchitis and asthma - (skin) - powder - ingested
7-Iguana (iguana)°	Iguana cf. iguana L. (Iguanidae/Reptilia) *	Osteoporosis and rheumatism (bone) - powder - ingested
8- Ant (formiga) ^□	Atta sexdens L. (Formicidae/Insecta) Garcia 001	Epilepsy (anthill) - in natura - ingested
9- Cockroach (barata) ^□	Periplaneta americana L. (Blattidae/Insecta) Garcia 002	Bronchitis and asthma (whole animal) - powder - ingested
10- Water cockroach (barata d'água)°	Abedus sp., Belostoma sp. or Diplonychus sp. (Belostomatidae/Insecta)*	Bronchitis and asthma (whole animal) - powder - ingested
11- Lizard (calango)°	Placosoma sp. (Gymnophthalmidae/Reptilia)*	Wounds in the body (skin) - powder - ingested
12- Armadillo-ball (tatu-bola)°	Tolypeutes sp. (Dasypodidae/Mammalia)*	Wounds in the body (skin) - powder - ingested

Marked by (^□) the two animals whose use had been maintained, while 10, marked by (°) are those whose uses have fallen into disuse.

* Animals that couldn't be collected because were not available in Diadema

Database survey

For the plants and animals identified to the species level, we searched the bibliographic databases PUBMED [29] and SCIFINDER [30] to determine whether they had been targets of previous pharmacological studies. To determine the origin of each plant species, we consulted the Dictionary of Useful Plants: exotic and native [31].

Dynamics of use

During our field work, we made an effort to understand the dynamics of use for each resource and classified them into the following four categories: maintenance of use (resource used for the same purpose in the migrant's city of origin and in Diadema), replacement (resources that were replaced when migrants arrived in Diadema because the original product was not available in Diadema or was less effective than the new resource), incorporation (resources used for the first time in Diadema to treat diseases common to larger cities, such as hypertension, diabetes and anxiety, which were not common in their homeland), and finally discontinued use (resources that are no longer used in Diadema, usually because they are not available).

Data analysis

The level of homogeneity between plant information provided by different migrants was calculated using the Informants' Consensus Factor, Fic [32]. This term is calculated as Fic = Nur - Nt /(Nur - 1), where Nur is the number of use reports from informants for a particular plant-usage category and Nt is the number of taxa or species used for that plant usage category across all informants. Values range between 0 and 1, with 1 indicating the highest level of informant consent. For instance, if certain taxa are consistently used by informants, then a high degree of consensus is reached and medicinal traditions are viewed as well-defined [33].

Results and Discussion

Migrant Interviews

Despite the fact that Diadema is composed by thousands of migrants, we observed that only a few have retained traditional knowledge pertaining to medicinal plants and animals. Some considerations should be made, in order to justify our decision of conducing a qualitative approach, in depth, with the sample of interviewees obtained during the two months prior to the start of the study. During this time we observed that in many cases, this knowledge has fallen into disuse because of: a) a cultural adaptation to the new city, b) the ease of conventional medical care, c) forest degradation, which restricts use of local plants and animals, furthermore d) many migrants have shown concern to participate in the study, since in the past they suffered persecution from government agencies and physicians, who eventually restrained their medical practice.

The five selected interviewees migrated from northeast and southeast Brazil and established themselves in Diadema in the 1940 s. Three were born in the northeast: two in Pernambuco state (coded as PE1 and PE2) and one in Sergipe state (SE1). The two remaining migrants were born in the southeast: one in Minas Gerais state (MG1) and one in inland São Paulo state (SP1) (Figure 1). All interviewees were Catholic, married and retired, with the exception of PE1 and PE2 who sell medicinal plants. Their average age was approximately 68 years old (ranging from 53 to 80 years old), and their level of education was semi-illiterate to illiterate. They learned about the medicinal uses of plants and animals from their parents and grandparents (Brazilian natives, European and African descendants) in their homelands. All interviewees arrived in the city of Diadema as adults, and some had migrated through different regions of Brazil, accumulating knowledge on natural resources from human and biological sources. In Diadema, they acquired knowledge from neighbours, books, media (radio, television, magazines), and personal experiences.

Plants: dynamics of use

The migrants described their knowledge of 85 plant specimens. As can be seen in Table 2, 78 of them were available in Diadema and were collected, resulting in 65 plant species, the remaining 13 could only be identified to the generic level. The plants belong to 37 taxonomic families, with Asteraceae (16 species), Lamiaceae (8) and Euphorbiaceae (7) as the most common. Previous studies have shown that Asteraceae species are the group most commonly reported to have potential pharmacological properties, not only in the Atlantic Forest [34–36] but also in other Brazilian biomes such as the Amazon Forest [37] the pantanal wetlands [38] and the cerrado savannahs [39]. In a review focusing on plants with possible action/effects on the central nervous system that were indicated by 26 Brazilian indigenous peoples occupying different Brazilian biomes [14], Asteraceae was the second most commonly cited family. The same pattern has been detected in other countries, such as Mexico [40]. One factor that may explain the common use of this taxonomic family is the large number of species belonging to it - about 20,000 [41]. Asteraceae also has a wide geographical distribution, both in Brazil and throughout the world [42], which facilitates its use by various cultures.

Table 2

The 78 plant specimens used by five Diadema's migrants (MG1, SP1, PE1, PE2, SE1)*.

Popular(s) name(s) (migrant)^{dynamic of use}	Specimen (family) Voucher	Origin - geographical distribution - cultivated (C) or spontaneous (S)	Use (part)	Formula and route of administration	Pharmacological studies
1-Alamanda-amarela (SE1^□, PE1^Δ)	Allamanda cathartica L. (Apocynaceae) Garcia 076	Native - Brazilian territory (C)	Toxic (whole plant)	Any oral dose is dangerous	Healing activity [65]
2-Alecrim (MG1)^□	Rosmarinus officinalis L. (Lamiaceae) Garcia 060	Exotic - all countries with temperate climate (C)	Muscle pain* (leaves)	Decoction - massage	Antibacterial effects [66], antimicrobial effect [67], anti-inflammatory and anti-tumor effects [68], cause reduction of reproductive fertility in male rats [69], antinociceptive effect [70], mosquito repellent activity [71], antidiabetic and antioxidant properties [72]
3-Alecrim-do-campo (SE1)^□	Baccharis dracunculifolia DC (Asteraceae) Garcia 021	Native - central Brazil (S)	Soothing (aerial parts)	Smoking - inhalation	Bactericidal activity [73], cytotoxic [74], antiulcerogenic [75], antimicrobial and antifungal [76]and anti-inflammatory [77]
4-Alfavaca (SP1)^□	Ocimum selloi Benth. (Lamiaceae) Garcia 033	Native - northeast to south Brazil (C)	Soothing (aerial parts)	Infusion - inhalation	Mosquito repellent activity [78]
			Bronchitis (leaves)	Syrup - ingestion
5-Algodão (MG1)^□	Gossypium sp. (Malvaceae) Garcia 066	No data (C)	Anti-inflammatory (leaves)	Infusion - inhalation	Not consulted
6-Algodão-do-mato (MG1, PE2)^□	Asclepias curassavica L. (Apocynaceae) Garcia 037	Exotic - Brazilian territory (S)	Toxic* (whole plant)	Any oral dose is dangerous	Cancer and warts treatment [79]and poisoning [80]
7-Almeirão-boca-de-leão (SE1)^Δ	Hypochoeris sp. (Asteraceae) Garcia 009	No data (S)	Liver pain (leaves)	In natura - ingestion	Not consulted
8-Amendoim-bravo, burra-leiteira (MG1, SP1, SE1, PE1, PE2)^□	Euphorbia heterophylla L. (Euphorbiaceae) Garcia 047	Native - Americas (S)	Toxic* (whole plant)	Any oral dose is dangerous	Cytotoxic properties [81]
9-Anador (SE1)^□	Alternanthera sp. (Amaranthaceae) Garcia 039	No data (C)	Soothing, headache, pain in the body (leaves)	Infusion - ingestion	Not consulted
10-Arnica (PE1)^□	Porophyllum ruderale (Jacq.) Cass. (Asteraceae) Garcia 075	Native - Brazilian territory (S)	Muscle pain* (aerial parts)	Decoction - massage	Anti-inflammatory [82]
11-Aroeira (MG1)^□	Schinus terebinthifolius Raddi (Anacardiaceae) Garcia 035	Native - northeast to south Brazil (S)	Diuretic (leaves)	Infusion - ingestion	Antifungal activity [83]and antibacterial [84]
12-Arruda (MG1, PE1, PE2)^□	Ruta graveolens L. (Rutaceae) Garcia 028	Exotic - Brazilian territory (C)	Earache and conjunctivitis/styl* (leaves)	In natura - topic	Antifertility [85], fungicide [86], cytotoxic [87], abortive [88], anti-tumour [89], anti-inflammatory [90], antiarrhythmic [91]and antimicrobial [92]
			Muscle pain (leaves)	Decoction - massage
13- Assa-peixe (MG1, SE1)^□	Vernonia sp. (Asteraceae) Garcia 048	No data (S)	Bronchitis (leaves)	Infusion - ingestion	Not consulted
			Expectorant (leaves)	Infusion - inhalation
			Healing wounds (leaves)	infusion - plaster
14-Avelóz (PE1, PE2)^□	Euphorbia tirucalli L. (Euphorbiaceae) Garcia 046	Exotic - Brazilian territory (C)	Toxic* (whole plant)	Restricted use (reports of blindness)	Anti-tumour activity [93], cause eye injury [94]and effect against arthritis diseases [95]
			Breast cancer* (latex)	Macerate - ingestion
15-Azaléia (PE1)^Δ	Rhododendron simsii Planch. (Ericaceae) Garcia 043	Exotic - Brazilian territory (C)	Toxic (whole plant)	Any oral dose is dangerous	Antioxidative [96]
16-Bálsamo (MG1, SP1, PE1, SE1)^□	Sedum sp. (Crassulaceae) Garcia 038	No data (C)	Earache (leaves)	In natura - topic	Not consulted
			Laxative (aerial parts)	In natura - ingestion
17-Boldo-do-Chile, figatil (PE1^□, SE1^Δ)	Vernonia condensata Baker (Asteraceae) Garcia 001	Exotic - northeast to southeast Brazil (C)	Liver pain* (leaves)	Infusion - ingestion	Anti-ulcerogenic [97]and analgesic and anti-inflammatory [98]
18-Brinco-de-princesa (SE1)^Δ	Alpinia zerumbet (Pers.) B.L. Burtt & R.M. Sm. (Zingiberaceae) Garcia 018	Exotic - Brazilian territory (C)	Sedative (flowers)	Infusion - ingestion	Antihypertensive effects [99], antinociceptive [100], anti-amoebic activity [101]and hepatoprotector [102]
19-Café (MG1)^□	Coffea arabica L. (Rubiaceae) Garcia 030	Exotic - Brazilian territory (C)	Diabetes (ripe fruits)	Infusion	Antioxidant [103]
			Sinusitis (powder fruit)	Infusion
20-Cana-do-brejo (SP1, PE2)^□	Costus spiralis (Jacq.) Roscoe (Costaceae) Garcia 019	Native - northeast and southeast Brazil (S)	Laxative and rheumatism (leaves)	Infusion or decoction - ingestion	Antiurolithiatic [104]
21-Cânfora (MG1, PE1, SE1)^□	Artemisia canphorata Vill. (Asteraceae) Garcia 045	Exotic - Brazilian territory (C)	Muscle pain (whole plant)	Decoction - massage	No data found
22-Capim-limão (MG1, SE1, PE2)^□	Cymbopogon citratus DC. - Stapf. (Poaceae) Garcia 026	Exotic - tropical countries (C)	Bronchitis* (leaves)	Syrup - ingestion	Anxiolytic [105], larvicidal activity [106], antibacterial [107], antimalarial activity [108], insect repellent [109], hypoglycemic and hypolipidemic effects [110]and antimicrobial activity [92]
			Sedative* (leaves)	Infusion - ingestion
23-Capuchinha (SP1, MG1)^Δ	Tropaeolum majus L. (Tropaeolaceae) Garcia 057	Exotic - south and southeast Brazil (C)	Ulcer and laxative (aerial parts)	Infusion or in natura - ingestion	Antitumor activity [111]
24-Carqueja (MG1)^□	Baccharis trimera (Less) DC (Asteraceae) Garcia 027	Native - south and southeast Brazil (C)	Diabetes* (whole plant)	Macerate - ingestion	Antihepatotoxic properties [112], anti-inflammatory and analgesic activity [113], relaxant effect [114], anti-proteolytic and anti-hemorrhagic properties [115], antioxidant compounds [116], antidiabetic activity [117]and for losing weight [118]
25-Carrapicho (SE1^#, MG1^□)	Acanthospermum australe (Loefl.) Kuntze (Asteraceae) Garcia 052	Native - Brazilian territory (S)	Wounds in the body (roots)	Medicinal wine - ingestion	Antimalarial activity [119]and antifungal activity [120]
26-Cavalinha (MG1)^□	Equisetum arvensis L. (Equisetaceae) Garcia 051	Exotic (C)	Diuretic (leaves)	Infusion - ingestion	No data found
27-Cipó-cruz (SE1, PE2)^Δ	Serjania sp. (Sapindaceae) Garcia 012	No data (S)	Reduces cholesterol and diarrhea (leaves)	Macerate - ingestion	Not consulted
			External allergies, wounds in the body and detoxifying (leaves)	Infusion - bath
28-Comigo-ninguém-pode (PE1)^□	Dieffenbachia sp. (Araceae) Garcia 071	No data (C)	Toxic (whole plant)	Any oral dose is dangerous	Not consulted
29-Dormideira (SE1)^□	Mimosa pudica L. (Fabaceae s.l.) Garcia 069	Exotic - Brazilian territory (C)	Healing wounds (aerial parts)	In natura - plaster	Antidepressant activity [121], antitoxin of the snake Naja kaouthia[122], anticonvulsant [123]and for reproductive problems [124]
30-Embaúba (MG1, SE1)^□	Cecropia pachystachya Tréc. (Cecropiaceae) Garcia 068	Native - south to northeast Brazil (S)	Bronchitis* (powder fruit)	Syrup - ingestion	Antioxidative activity [125], cardiotonic and sedative effects [126]and anti-inflammatory [127]
			Toxic (sap)	Any oral dose is dangerous
31-Erva-cidreira (MG1, SE1, PE2)^□	Lippia alba (Mill.) N. E. Br. (Verbenaceae) Garcia 005	Native - almost all Brazilian territory (S)	Expectorant* (aerial parts)	Infusion - inhalation	Treatment of respiratory diseases [128], antiulcerogenic activity [129], sedative and anticonvulsant effects [130], antiviral and antiherpes [131]
			Sedative* (aerial parts)	Infusion or decoction - ingestion
32-Erva-de-bicho (SE1)^□	Ludwigia sp. (Onagraceae) Garcia 078	No data (S)	Hemorrhoid (whole plant)	Decoction - bath	Not consulted
33-Erva-doce, funcho (MG1, SP1, PE1, PE2)^□	Foeniculum vulgare Mill. (Apiaceae) Garcia 064	Exotic -Brazilian territory (C)	Sedative (whole plant)	Infusion - ingestion	Antimicrobial activity [132], anti-inflammatory, analgesic and antioxidant activities [133], acaricidal activity [134], antifungal effect [135], antithrombotic activity [136]and larvicidal activity of the mosquito Aedes aegypti[137]
			Bronchitis* (whole plant)	Infusion - inhalation
			Laxative (whole plant)	Infusion or macerate - ingestion
34-Eucalipto, vick (MG1^□, PE1^Δ, PE2^Δ, SE1^□)	Eucalyptus globulus Labill. (Myrtaceae) Garcia 055	Exotic (C)	Sinusitis* (leaves)	Infusion - inhalation	Antihyperglycemic actions [138], analgesic and anti-inflammatory effects [139], antimicrobial activity [140]and antibacterial effects [141]
35-Fedegoso (MG1)^□	Senna pendula (Humb. & Bonpl. ex Willd.) H.S. Irwin & Barneby (Fabaceae s.l.) Garcia 034	Native - Brazilian territory (S)	Osteoporosis prevention (roots)	Medicinal wine - ingestion	No data found
36-Feijão-guandu (SP1)^□	Cajanus cajan (L.) Millsp. (Fabaceae s.l.) Garcia 003	Exotic - Brazilian territory (C)	Bronchitis (leaves)	Infusion - ingestion or inhalation	Treatment of postmenopausal osteoporosis [142], antileishmanial and antifungal activity [143]and hypocholesterolemic effect [144]
37-Folha-santa, folha-da-fortuna (MG1, SP1, PE1)^□	Bryophyllum pinnatum (Lam.) Oken (Crassulaceae) Garcia 040	Exotic - Brazilian territory (C)	Lumbar pain* (leaves)	In natura - plaster	Antibacterial activity [145], anti-ulcer [146], antimicrobial [147], antinociceptive, anti-inflammatory and antidiabetic [148]and neurosedative and muscle relaxant activities [149]
			Sedative* (leaves)	In natura - plaster
38-Gervão (MG1)^□	Stachytarpheta cayennensis (Rich.) Vahl (Verbenaceae) Garcia 054	Native - Brazilian territory (S)	Laxative (aerial parts)	Infusion or decoction - ingestion	Anti-inflammatory and anti-ulcerogenic properties [150]and hypoglycaemic constituents [151]
39-Goiaba (SE1)^□	Psidium guajava L. (Myrtaceae) Garcia 058	Native - Mexico to Brazil (S)	Heartburn (leaves)	Infusion or in natura - ingestion	Antibacterial activity [152–154]and hepatoprotective activity [155]
			Diarrhea (fruit)	In natura - ingestion
40-Guaco (PE1^□, PE2^□, SE1^Δ)	Mikania glomerata Spreng. (Asteraceae) Garcia 032	Native - northeast to southeast Brazil (S)	Bronchitis* (leaves)	Syrup - ingestion	Analgesic and anti-inflammatory activities [156], bronchodilator activity [157]and antiophidian properties [158]
41-Guanxuma (SE1)^Δ	Sida rhombifolia L. (Malvaceae) Garcia 067	Exotic - Brazilian territory (S)	Sedative (aerial parts)	Infusion - ingestion or inhalation	Cytotoxicity, antibacterial activity [159]and antioxidant [160]
42-Guiné (SE1)^Δ	Petiveria alliaceae L. (Phytolaccaceae) Garcia 004	Native - north Brazil (S)	Sedative (aerial parts)	Environment purifier - inhalation	Antimicrobial substance [161], antimitotic action [162], anti-inflammatory and analgesic effects [163], antibacterial and antifungal activity [164]and antioxidant [165]
			Muscle pain* (leaves)	Decoction - massage
43-Hortelã (MG1, PE1)^□	Mentha arvensis L. (Lamiaceae) Garcia 031	Exotic - Brazilian territory (C)	Bronchitis* (leaves)	Syrup - ingestion	Antifungal property [166], vasodilatory actions [167], antioxidative activity [168], antibacterial properties [107]and insect repellents and fumigants [109]
			Laxative (leaves)	Infusion - ingestion
44-Hortelã-grande (PE1)^□	Plectranthus amboinicus (Lour.) Spreng. (Lamiaceae) Garcia 073	Exotic - Brazilian territory (C)	For digestion and urine with blood (leaves)	Infusion - ingestion	Scorpion venon antidote [169]and antimicrobial activity [92]
			Cough (leaves)	Syrup - ingestion
45-Impatiens (PE1)^Δ	Impatiens hawkeri W. Bull. (Balsaminaceae) Garcia 044	Exotic - Brazilian territory (C)	Toxic (whole plant)	In closed environment causes tearing, allergy and headache	No data found
46-Jarnaúba (PE1)^Δ	Synadenium grantii Hook. F. (Euphorbiaceae) Garcia 074	Exotic - southeast to northeast Brazil (C)	Toxic (whole plant)	Restricted use	Healing action and anti-hemorrhagic [170]
			Stomach cancer (latex)	Macerate - ingestion
47-Jurubeba (MG1, SE1, PE2)^□	Solanum variabile Mart. (Solanaceae) Garcia 056	Native - southeast and south Brazil (S)	Sedative (leaves)	Infusion - ingestion	Antiulcerogenic activity [171]
			Laxative (powder fruit)	In natura - ingestion
48-Limão (MG1)^□	Citrus aurantifolia (Christm.) Swingle (Rutaceae) Garcia 063	Exotic - Brazilian territory (C)	Fever (leaves)	Infusion - ingestion	Mosquito repellent activity [172]
49-Losna (SP1, SE1, PE2)^□	Artemisia absinthium L. (Asteraceae) Garcia 049	Exotic - Brazilian territory (S)	Laxative (aerial parts)	Infusion - ingestion	Acaricidal properties [173], antifungal and antibacterial [174]and antioxidant activities [175]
50-Malva-branca (SE1)^□	Waltheria indica L. (Sterculiaceae) Garcia 077	Native - Brazilian territory (S)	Gingivitis* (leaves)	Infusion - gargling	Anti-inflammatory activities [176]
			Inflammation in the mouth and/or throat* (leaves)
51-Malva-de-cheiro (MG1)^□	Malva sylvestris L. (Malvaceae) Garcia 059	Exotic - south and southeast Brazil (S)	Wounds in the body (roots)	Medicinal wine - ingestion	Skin anti-aging property [177]
52-Mamão-papaia (PE1)^□	Carica papaya L. (Caricaceae) Garcia 062	Exotic - Brazilian territory (C)	Bronchitis* (powder fruit)	Syrup - ingestion	Abortive [178], antibacterial activity [179], diuretic [180]and healing and abortive effects [181]
53-Mandioca (SE1)^□	Manihot esculenta Crantz (Euphorbiaceae) Garcia 050	Native - Brazilian territory (C)	conjunctivitis/sty* (dew on the leaves)	In natura - topic	Analgesics and anti-inflammatory effects [182]
54-Manjericão (MG1)^□	Ocimum basilicum L. (Lamiaceae) Garcia 061	Exotic - Brazilian territory (C)	Bronchitis* (leaves)	Syrup - ingestion	Antibacterial [183], mosquito repellent activity [184], antimicrobial activity [185], antigiardial activity [186]and decreases cholesterol [187]
55-Maravilha (SP1, PE2)^□	Mirabilis jalapa L. (Nyctaginaceae) Garcia 065	Native - Brazilian territory (C)	Healing wounds* (aerial parts)	Infusion - plaster	Antibacterial effect [188]and antimicrobial [189]
56-Maria-pretinha (MG1)^□	Solanum americanum L. (Solanaceae) Garcia 070	Native - Americas (S)	Sore throat* (aerial parts)	Infusion - gargle	Treatment of protozoal infections ( American trypanosomes ) [190]and moderate antioxidant activity [191]
57-Mentrasto (PE1)^□	Ageratum conyzoides L. (Asteraceae) Garcia 010	Native - southeast to northeast Brazil (S)	Bronchitis* (leaves)	Infusion - ingestion	Anti-inflammatory [192], toxic [193], antibacterial [194]and insecticidal activity [195]
			Rheumatism* (whole plant)	Infusion - bath
58-Mentruz, erva-de-santa-maria (PE1^#, SE1^□)	Chenopodium ambrosioides L. (Chenopodiaceae) Garcia 006	Native - south and southeast Brazil (S)	Muscle pain (aerial parts)	Decoction - massage	Insecticidal properties [196], antifungal, antiaflatoxigenic and antioxidant activity [197]and mosquito repellent activity [71]
			Lesions in bone (aerial parts)	In natura - plaster
			Worm* (aerial parts)	Infusion - ingestion
			Bronchitis (aerial parts)	Syrup - ingestion
59-Milho (SE1)^□	Zea mays L. (Poaceae) Garcia 023	Exotic - Brazilian territory (C)	Bronchitis (flowers)	Syrup - ingestion	No data found
			Blood purifier and diuretic (flowers)	Infusion - ingestion
60-Novalgina (MG1, SE1)^□	Achillea millefolium L. (Asteraceae) Garcia 015	Exotic - south and southeast Brazil (C)	Sedative (leaves)	In natura - ingestion	Antioxidant and antimicrobial activity [198]
61-Pariparoba (MG1)^□	Piper umbellatum L. (Piperaceae) Garcia 072	Native - Tropical America (S)	Belly ache and liver pain (leaves)	Infusion - ingestion	Antioxidant [199]and antifungal activity [200]
62-Picão (MG1)^□	Calea sp. (Asteraceae) Garcia 036	No data (S)	Diuretic (leaves)	Infusion - ingestion	Not consulted
63-Picão-preto (MG1, PE1)^□, Picão-branco (SP1)^□	Bidens pilosa L. (Asteraceae) Garcia 020	Native - tropical America (S)	Blood purifier (whole plant)	Infusion - ingestion	Hypotensive effects [201], anti-inflammatory activity [202], anticancer and antipyretic activity [203], antimicrobial [204]and antitumor potential [205]
			Healing wounds* (whole plant)	In natura - plaster
			Wounds in the body* (roots)	Medicinal wine - ingestion
64-Pinhão-roxo (SP1)^□	Jatropha gossypiifolia L. (Euphorbiaceae) Garcia 017	Native - southeast to northeast Brazil (S)	Laxative (powder fruit)	In natura - ingestion	Antimalarial effects [206], hypotensive and vasorelaxant effects [207]
65-Poejo (MG1, PE2)^□	Mentha pulegium L. (Lamiaceae) Garcia 029	Exotic - Brazilian territory (C)	Bronchitis (leaves)	Syrup - ingestion	Larvicidal activity [208], acaricidal effects [209]and insecticidal properties [210]
66-Pucunã (SE1)^□	Fevillea passiflora Vell. (Cucurbitaceae) Garcia 022	Native - North and southeast Brazil (S)	Toxic - abortive (seeds)	In natura - ingestion	No data found
67-Quebra-pedra (SP1, PE1, PE2, SE1)^□	Phyllanthus caroliniensis Walter (Euphorbiaceae) Garcia 024	Native - USA to Brazil (S)	Kidney stone* (aerial parts)	Infusion or decoction - ingestion	Antinociceptive action [211]
68-Quitoco (SE1)^□	Pluchea sagittalis (Lam.) Cabrera (Asteraceae) Garcia 042	Native - south and southeast Brazil (S)	Diuretic (aerial parts)	Infusion - ingestion	Anti-inflammatory activity [212]
69-Rubim (MG1, SP1)^□	Leonurus sibiricus L. (Lamiaceae) Garcia 002	Exotic - Brazilian territory (C)	Healing wounds* (aerial parts)	In natura - plaster	Stimulating action on the uterus [213], analgesic and anti-inflammatory activity [214]and antibacterial activity [215]
70-Sabugueiro (MG1)^□	Sambucus canadensis L. (Caprifoliaceae) Garcia 025	Native - Brazilian territory (S)	Bronchitis* (flowers)	Syrup - ingestion	Infectious diseases and antioxidant activity [216]
71-Salsa-parreira (SE1)^□	Jacaranda sp. (Bignoniaceae) Garcia 011	No data (S)	External allergies, wounds in the body and purifier (leaves)	Decoction - bath	Not consulted
72-Samba-caitá (SE1)^□	Hyptis sp. (Lamiaceae) Garcia 041	No data (S)	Belly ache (leaves)	In natura - ingestion	Not consulted
73-Serralha (PE1)^□	Sonchus oleraceus L. (Asteraceae) Garcia 016	Exotic - Brazilian territory (S)	Diabetes (leaves)	In natura - ingestion	Larvicidal potential [217]
74-Sete-sangria (MG1^□, SP1^□, SE1^Δ)	Cuphea carthagenensis (Jacq.) J. F. Macbr. (Lythraceae) Garcia 007	Native - Brazilian territory (S)	Intestinal infections and heart problems* (aerial parts)	Infusion - ingestion	Antiinflammatory and antinociceptive activities [218], vasorelaxant properties [219], treat high levels of cholesterol and triglycerides [220]
75-Sofre-do-rim-quem-qué (MG1)^#	Cissus sp. (Vitaceae) Garcia 053	No data (S)	Kidney stone (leaves)	Infusion - ingestion	Not consulted
76-Tanchagem (SP1, PE2)^□	Plantago sp. (Plantaginaceae) Garcia 008	No data (S)	Anti-inflammatory - mouth and throat (leaves)	Decoction - gargling	Not consulted
77-Vassourinha (SE1, PE2)^□	Scoparia dulcis L. (Scrophulariaceae) Garcia 014	Native - Brazilian territory (S)	Hip pain/kidneys (leaves)	Decoction - bath	Antitumor-promoting activity [221], antioxidant [222], antimicrobial and antifungal activities [223]
78-Velando (SE1)^□	Croton fuscescens Spreng (Euphorbiaceae) Garcia 013	Native - Brazilian territory (S)	Inhibits the growth of skin stains/wounds in the body (resin)	In natura - topic	No data found

* their popular and scientific names, geographical origin and distribution, if cultivated or spontaneous, uses, parts utilized, formula, route of administration and pharmacological studies. Marked by (^□) the 68 plants whose use had been maintained by the respective migrant, while 14, marked by (^Δ) are those whose applications have been incorporated by migrants, finally, 3 (^#) are replacements. The matches between the uses proclaimed by the interviewees and pharmacological data have been posted by (*).

From the 65 species identified, it was observed that 33 are native to Brazil while the other 32 are exotic, demonstrating the great floral diversity of the region, which was influenced by European and African people during the civilizing process in Brazil. Furthermore, of the 78 specimens recorded, 54% (42) are spontaneous or were already available in Diadema when interviewees arrived there, while 46% (36) were grown by the migrants, acquired in free markets, or brought from other regions of the country during migration. Below, we describe the four 'dynamics of use' categories observed during this study.

Maintenance of use

According to the interviewees, 68 of the 78 specimens cited in the present study, were used in their homelands (highlighted with □ in Table 2). The maintenance of their uses was possible since most of them were available in Diadema, though some were brought from their homelands. SE1 brought four plants from Aquidabã - Sergipe state, for pain relief because they are not available or are more potent than the ones found in Diadema: "bálsamo" (Sedum sp.), "anador" (Alternanthera sp.), "eucalipto/vick" (Eucalyptus globulus Labill.) and "novalgina" (Achillea millefolium L.).

Incorporation of use

Fourteen of the 78 specimens listed in Table 2 came to be used by migrants when they arrived in Diadema (highlighted with Δ in Table 2). These incorporations occurred in several ways: through information given by neighbours; through local media, e.g., television, radio, magazines; or through personal efforts, guided by plant organoleptic properties or even by the theory of signatures. This theory, formulated by Paracelsus (XVI century), assumes that characteristics and virtues of herbs can be recognised by their external appearance or "signature" (picture, shape, colour). Finally, observing the relationship between animals and plants can be a valuable guide. PE1 noted that dogs consume "sete-sangria" (Cuphea carthagenensis (Jacq.) J. F. Macbr.) when they have diarrhoea; and because it seemed to alleviate their symptoms, he started to use this plant for the same purpose.

The migrants incorporated several plants after their arrival in Diadema to treat typical diseases of larger cities: "cipó-cruz" (Serjania sp.) to combat high cholesterol; and "guanxuma" (Sida rhombifolia L.) and "guiné" (Petiveria alliaceae L.) for anxiety. Also included in this category was knowledge concerning local toxic plants, e.g., alamanda-amarela (Allamanda cathartica L.) and azaléia (Rhododendron simsii Planch.), detailing the risks associated with their consumption.

Replacement of use

Three plants used by migrants in their cities of origin were replaced because they were not available or were less effective than plants present in Diadema (highlighted with # in Table 2). Most of these replacements were made according to the criteria listed in the previous section.

The interviewee MG1 explained that in his homelands, he used "quebra-pedra"* (Phyllanthus cf. caroliniensis Walter - Euphorbiaceae) for kidney stone disturbance, but when he arrived in Diadema, he found another plant, "sofre-do-rim-quem-qué" (Cissus sp.), that seemed to have a stronger effect.

Another interviewee, PE1, reported that the bark and seeds of "amburana-de-cheiro"* (Amburana cf. cearensis (Allemão) A.C. Sm. - Fabaceae s.l.) were widely used for anti-inflammatory therapy in Pernambuco state but had to be replaced by "mentruz" (Chenopodium ambrosioides L.) because the former was not found in Diadema. In addition, SE1 had to replace "pau-de-sapo"* (Pouteria cf. melinoniana Boehni - Sapotaceae), whose leaves were used for chronic wounds, with "carrapicho" (Acanthospermum australe (Loefl.) Kuntze).

The vernacular names of some plants are registered trademarks of allopathic medicines and active ingredients, e.g., Novalgina^® (Achillea millefolium) and Vick^® (Eucalyptus globulus) for sinusitis, and Anador^® (Alternanthera sp.), which is used as a sedative and for general pain. Contact between migrants and allopathic medicine thus led to the 'baptisms' of these plants, following the observation that both, the commercially available products and herbal source have similar effects, as reported by Pires [43].

Discontinued use

According to MG1, the following plants used in his homeland fell into disuse because they were not found in Diadema, although he tried to acquire them from local commercial sources: "quina"* (Strychnos cf. pseudoquina A. St. Hil - Loganiaceae), whose root is used to combat pain in the stomach and intestine; bark oil of "jatobá"* (Hymenaea cf. courbaril L. - Fabaceae s.l.), used for combat wounds; "batata-de-purga"* (Operculina cf. macrocarpa (L.) Urb - Convolvulaceae), whose tuber is ingested as a purgative and to clean the blood; bark and leaf of "jalapa"* (Mirabilis cf jalapa L. - Nyctaginaceae), used to clean the blood; tea of "junco"* (Cyperus cf. esculentus L. - Cyperaceae), whose root is used for inflammation; bark or seed of "emburana"* (Amburana cf. cearensis - Fabaceae s.l.), used for migraine and sleeping; and bark of "angico"* (Anadenanthera cf. colubrina (Vell.) Brenan - Fabaceae s.l.), prepared as a tea for pain in the body and fever. These plants were not described in Table 2, since they could not be collected and identified as well.

Plants used for therapeutic purposes

Of the 78 plants, 10 carry some restrictions, as they can be toxic depending on the dose, route or part utilised (Table 2). The uses described in Table 2 are written just as they were reported by the interviewees. The 68 plants used exclusively for medicinal purposes were cited for 41 complaints, which were grouped into 12 functional categories according to bodily system, as detailed in Table 3. Thus, gastrointestinal disturbances include the following complaints (numbers of medicinal plants reported): endoparasitosis (1), ulcer (1), diarrhoea (1), bellyache (2), heartburn (1), intestinal infections (1), liver pain (3). This category also includes plants used to improve digestion (1), to treat tables of haemorrhoid (1), as laxatives (10) and to purify the stomach (2), comprising a total of 24 plants employed in 44 formulas.

Table 3

The 12 categories of use comprising the 41 complaints, their total and partial number of plants cited by the five migrants.

Category of use	Complaints (number of plants cited)	Total number of plants
1- Gastrointestinal disturbances	To combat worms (1), ulcer (1), diarrhoea (1), bellyache (2), heartburn (1), intestinal infections (1), liver pain (3), to improve digestion (1), hemorrhoid (1), as laxative (10) and for stomach purify (2)	24
2- Inflammatory processes	As anti-inflammatory (3) and healing (6), to treat sty/conjunctivitis (2), inflammation in the mouth/throat (3), rheumatism (2), sinusitis (2) and gingivitis (1)	19
3- Respiratory problems	To combat cough (1), bronchitis (15) and as expectorant (2)	18
4- Anxiolytic/hypnotics	As sedative (11)	11
5-O steomuscular problems	To ease back pain (1), muscles pain (6), hip pain (1), prevent osteoporosis (1) and to treat lesions in bone (1)	10
6- Dermatological problems	To combat external allergies (2), wounds in the body (5) and inhibits the growth of skin stains (1)	8
7- Genitourinary disturbances	As diuretic (5), to combat kidney stone (2) and treating urine with blood (1)	8
8- Endocrine system	To reduce cholesterol (1) and diabetes (3)	4
9- Cardiovascular problems	Treat heart problems (1) and as blood purifier (2)	3
10- Immunological problems	To combat breast cancer (1) and stomach cancer (1)	2
11- Analgesics	Earache (2)	2
12- Fever	To combat fever (1)	1
Total		110*

* Some plants have been cited for more than one complaint, so the total number of plants above (110) is higher than the ones indicated by the interviewees.

The most relevant categories of use, measured by number of species employed, were gastrointestinal disturbances (30.8% of plants), inflammatory processes (24.4%) and respiratory problems (23.1%). As seen in Table 4, the group of illnesses representing immunological problems obtained the highest informant consensus factor value (Fic = 0.66), while the other categories presented Fic values lower than 0.5. These low values reflect the diversity of knowledge displayed by migrants, which can probably be attributed to different cultural influences during their migrations through Brazilian territory. Furthermore, the small number of interviewees may have resulted in low values of Fic.

Table 4

Values of Informant consensus factor (Fic) for each category of use, considering the plants cited by the five Diadema's migrants.

SN	Category of use	Plant specimen	% All Species	Use citation	% All use citation	Fic
1	Gastrointestinal disturbances	24	30.77	44	25.29	0.46
2	Inflammatory processes	19	24.36	28	16.09	0.33
3	Respiratory problems	18	23.07	31	17.82	0.43
4	Anxiolytic/hypnotics	11	14.10	19	10.92	0.44
5	Osteomuscular problems	10	12.82	13	7.47	0.25
6	Dermatological problems	8	10.26	11	6.32	0.3
7	Genitourinary disturbances	8	10.26	13	7.47	0.41
8	Endocrine system	4	5.13	5	2.87	0.25
9	Immunological problems	2	2.56	4	2.30	0.66
10	Cardiovascular problems	3	3.84	3	1.72	0
11	Analgesics	2	2.56	2	1.15	0
12	Fever	1	1.28	1	0.57	0

The parts of the plants most often used in the formulas were leaves (45.4%) and other aerial parts (22.7%). The most common formula was the infusion (37.8%), followed by in natura (17.6%) and syrup (10.1%). The most cited route of administration was ingestion (51.3%), followed by inhalation (8.4%) and topical (3.4%).

Plants with restrictions on use and/or toxic

Among the 10 specimens with restrictions on use, 6 were designated as only toxic: "alamanda-amarela" (Allamanda cathartica), "algodão-do-mato" (Asclepias curassavica L.), "amendoim-bravo/burra-leiteira" (Euphorbia heterophylla L.), "azaléa" (Rhododendron simsii), "comigo-ninguém-pode" (Dieffenbachia sp.) and "impatiens" (Impatiens hawkeri). The interviewees explained that depending on the dose, the latex of "alamanda-amarela" and "amendoim-bravo" can cause discomfort or even blindness. According to Oliveira et al. [44], the leaves of Dieffenbachia picta Schott contain calcium oxalate, which damages the oral mucosa and provokes pain and oedema, while the leaves of Allamanda cathartica contain cardiotonic glycosides and induce intense gastrointestinal disturbances.

Although reported as toxic, the latex of two other plants can be used at low doses to treat breast and stomach cancer: "avelóz" (Euphorbia tirucalli L.) and "jarnaúba" (Synadenium grantii Hook. F.), respectively. The sap of "embaúba" (Cecropia pachystachya Tréc.) was indicated as toxic, but its fruits are used to combat bronchitis. Finally, the seeds of "pucunã" (Fevillea passiflora Vell.) are toxic, being indicated as abortive. In a recent study, Rodrigues [45] also described plants with restrictions of use as reported by three Brazilian cultures: the Krahô Indians use two plants as abortives in a single prescription: "aprytytti" (Acosmium dasycarpum (Vogel) Yakovlev) and "ahkryt" (Anacardium occidentale L.) (Anacardiaceae); their barks are boiled, and the beverage is ingested in at dawn. It is an extremely bitter beverage, rich in tannin and therefore extremely astringent.

Pharmacological data

As can be seen in Table 2, 57 species (73.1%) were featured in previous pharmacological studies. For 30 of these species (52.6%), the uses cited by the migrants showed some similarity to the investigated effects/actions, demonstrating concordance between popular knowledge and academic science (marked with an asterisk in Table 2).

Table 5

The 6 categories of use comprising the 9 complaints, their respective number of animals mentioned by the migrant PE2.

Category of use	Complaints (number of animals)
1-Respiratory problems	bronchitis (7), asthma (4)
2-Central nervous system	epilepsy (1)
3-Inflammatory processes	rheumatism (1)
4-Dermatological problems	wounds in the body (1), skin cancer (1)
5-Analgesics	back pain (1)
6-Cardiovascular problems	treat heart problems (1), hemorrhage (1)
Total	18*

* some animals have been cited for more than one complaint, so their total number above (18) is higher than the number of animals indicated: 12.

Animals used for therapeutic purposes and dynamics of use

From the five interviewees, only one (PE2) offered knowledge on the medicinal uses of 12 animals. They belong to four taxonomic classes: Reptilia (6 species), Insects (3), Mammalia (2) and Amphibia (1). However, the interviewee has used only two animals since he arrived in Diadema, the other ten animals fell into disuse because they are not available in this city. The two animals were collected, identified and deposited in the Museum of Zoology-USP: ant (Atta sexdens L.) and cockroach (Periplaneta americana L.). These species belong to the maintenance of use category (highlighted with □ in Table 1). The other ten species therefore belong to the discontinued use category (highlighted with ^Ο in Table 1) which could not be collected. Their identifications were made by PE2 through consulting images from books (as described in Methodology). For three animals (snake, alligator and giant water bug) PE2 could only hesitantly confirm their identity, probably due to the great diversity of these animals in Brazil. Therefore, they are denoted in Table 1 as probably belonging to one of three possible genera.

The animals were used in 14 different medicinal formulas, with the skin most commonly used (33.3%), followed by whole animal (20.0%), bone (13.4%), fat (6.7%), rattle (6.7%), tooth (6.7%), anthill (6.7%) and turtleshell (6.7%). Some studies conducted in Brazil show that concomitant data corroborate and sustain these uses [46–50]. The formulas were cited for the treatment of nine complaints, which were grouped into six functional categories, as shown in Table 5. The most commonly cited formula was powder (66.7%), followed by in natura (20%). The most frequent route of administration was ingestion (78.6%).

The most common complaint involved respiratory problems (58.4%; 7 animals) followed by central nervous system (8.3%), inflammatory processes (8.3%), dermatological problems (8.3%), analgesics (8.3%), cardiovascular problems (8.3%) as shown in Table 5. The high humidity of the region (with annual rainfall between 1.000 and 1750 mm) [21] is known to lead to bronchitis, cough and asthma. This may explain why so many plants and animals were used to treat respiratory disturbances in Diadema, which has been shown in studies of the Sistema Único de Saúde [51] to be the second largest cause of death in Diadema - 14,4%.

Many animals have been used for medical purposes since antiquity [52–55]. Despite the existence of several ethnopharmacological studies suggesting the bioactive potential of Brazilian fauna [37, 56–61], only marine animals have been investigated by chemical and pharmacological methods [62–64]. No pharmacological data was found in the literature for the five animals identified in the present study: rattlesnake (Crotalus cf. durissus L.), capybara (Hydrochoerus cf. hydrochaeris L.), iguana (Iguana cf. iguana L.), ant (Atta sexdens) and cockroach (Periplaneta americana). The lack of information available on medicinal animal products leads us to conclude that this is a largely unexplored topic in Brazil and that future pharmacological studies should confirm the potential therapeutic value of these species.

Conclusion

The migrant interviewees demonstrated knowledge about the medicinal and toxic properties of plants and animals available in the Atlantic Forest remnants of the municipality of Diadema. Migration contributed to the expansion of knowledge regarding the use of natural resources, especially through the processes of resource replacement and/or incorporation. Moreover, the maintenance of original uses of certain resources demonstrates their value in the migrants' therapeutic practices.

The seven plants [Impatiens hawkeri W. Bull., Artemisia canphorata Vill., Equisetum arvensis L., Senna pendula (Humb. & Bonpl. ex Willd.) H.S. Irwin & Barneby, Zea mays L., Fevillea passiflora Vell. and Croton fuscescens Spreng)] and the two animals (Atta sexdens and Periplaneta americana) that showed maintenance of use among migrants during their displacement in Brazilian territory, have not been studied by pharmacologists yet. These species should be highlighted in further investigations because the maintenance of use during human migrations can be indicative of bioactive potential.

This work also demonstrates the impossibility of sharing benefits related to property rights with cultures under certain circumstances, as the dynamic use of natural resources presents particularly varied influences. The interviewed migrants had passed through several Brazilian cities and were exposed to distinct vegetation and cultures. In this migration, they have passed on and incorporated knowledge in an intensive exchange where formulas and uses are mixed and re-invented as a result of contact between cultures.

Declarations

Acknowledgements

We thank the interviewees for their hospitality, help, and mainly for providing us with information for the purpose of this study. We are grateful to Julino Assunção Rodrigues Soares Neto, Valéria Basti, Maria Conceição D.A. Fernandes. We also appreciate the help of FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo), FIC (Faculdade Integral Cantareira) and AFIP (Associação Fundo de Incentivo à Psicofarmacologia), Herbário Municipal de São Paulo (PMSP), which provided financial support which made this research possible. Finally, we thank Dr. Lúcia Rossi and Prof. Dr. Hussam El Dine Zaher, for conducting the botanical and animal identification, respectively.

Authors’ Affiliations

(1)

Department of Biology, Universidade Federal de São Paulo, Diadema, Brazil

(2)

Department of Psychobiology, Universidade Federal de São Paulo, São Paulo, Brazil

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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Ethnopharmacological survey among migrants living in the Southeast Atlantic Forest of Diadema, São Paulo, Brazil

Abstract

Background

Methods

Results

Conclusions

Keywords

Background

Methodology

Fieldwork

Database survey

Dynamics of use

Data analysis

Results and Discussion

Migrant Interviews

Plants: dynamics of use

Maintenance of use

Incorporation of use

Replacement of use

Discontinued use

Plants used for therapeutic purposes

Plants with restrictions on use and/or toxic

Pharmacological data

Animals used for therapeutic purposes and dynamics of use

Conclusion

Declarations

Acknowledgements

Authors’ Affiliations

References

Copyright

Journal of Ethnobiology and Ethnomedicine

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