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Woody Medicinal Plants of the Caatinga in the State of Pernambuco (Northeast Brazil)

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Woody Medicinal Plants of the Caatinga in the State of Pernambuco (Northeast Brazil) Acta bot. bras. 19(1): 17-26. 2005 Woody medicinal plants of the caatinga in the state of Pernambuco (Northeast Brazil) Ana Carolina Oliveira da Silva1 and Ulysses Paulino de Albuquerque1,2 Received: March 10, 2003; Accepted: July 13, 2004 RESUMO – (Plantas medicinais arbóreas da caatinga no Estado de Pernambuco (Nordeste do Brasil)). Com o objetivo de analisar, a partir de uma perspectiva etnobotânica, a importância relativa das espécies arbóreas medicinais da caatinga pernambucana, foram selecionados trabalhos florísticos e fitossociológicos realizados em seis áreas no Estado de Pernambuco. Para análise dos dados, foram selecionadas apenas as espécies identificadas até o nível de espécie e para cada uma levantou-se informações medicinais disponíveis na literatura. Para cada espécie calculou-se a importância relativa. Das 57 espécies arbóreas, 22 possuem indicação terapêutica, sendo Anacardium occidentale L., Tabebuia impetiginosa (Mart. ex DC) Standley, Schinopsis brasiliensis Engl. e Myracrodruon urundeuva (Engl.) Fr. All., as espécies com os maiores valores de Importância Relativa. A análise de correlação evidenciou que a importância relativa das espécies encontra-se negativamente correlacionada com a Densidade e Freqüência Relativas (p< 0,05). As espécies mais importantes, do ponto de vista etnobotânico, são também as mais vulneráveis devido à exploração sistemática que vêm sofrendo. Schinopsis brasiliensis e Myracrodruon urundeuva constam na lista de espécies ameaçadas de extinção e merecem atenção especial no desenvolvimento de técnicas de manejo sustentável, visando retorno econômico e garantindo a conservação. São necessários estudos detalhados que analisem as peculiaridades de cada região, tanto do ponto de vista florístico quanto etnobotânico, uma vez que cada área parece ter sua própria flora arbórea medicinal, como sugerido nas análises de agrupamento. Palavras-chave: Florestas tropicais secas, plantas medicinais, etnobotânica, florística, fitossociologia ABSTRACT– (Woody medicinal plants of the caatinga in the state of Pernambuco (Northeast Brazil)). Floristic and phytosociological studies undertaken in six areas of the state of Pernambuco were selected with the aim of analyzing the Relative Importance of the woody medicinal plant species of Pernambuco’s caatinga from an ethnobotanical perspective. For the data analysis, only those identified up to the species level were selected and information on medicinal properties was obtained for each one from the literature. The Relative Importance was calculated for each species. From the 57 woody species, 22 had therapeutic indications; from these, Anacardium occidentale L., Tabebuia impetiginosa (Mart. ex DC) Standley, Schinopsis brasiliensis Engl., and Myracrodruon urundeuva (Engl.) Fr. All. had the greatest values of Relative Importance. The correlation analysis made clear that the Relative Importance of the species is negatively correlated with the Density and Relative Frequency (p<0.05). The most important species, in the ethnobotanical point view, are the most vulnerable, possible due to the systematic exploration they have been suffering. Schinopsis brasiliensis and Myracrodruon urundeuva are listed as endangered species and deserve special attention in the development of techniques of sustainable management, where both economic return and species conservation must be guaranteed. In depth studies that take into consideration each region’s characteristics are necessary both from a floristic perspective and considering medicinal aspects, since each area seems to have its own woody medicinal flora, as suggested in the cluster analysis. Key words: Tropical dry forests, medicinal plants, ethnobotany, floristic, phytosociology Introduction few types of vegetation whose distribution is totally restricted to Brazil (Hueck 1972; Ferri 1980), but little The caatinga is a dry forest, green only during is known yet about its floristic diversity. Some studies rainy periods, with spiny shrubs, and adapted to the undertaken (Agra 1999; Lima 1999; Albuquerque more sterile soils. Caatinga vegetation comprises an et al. 2005) reveal species with great potential as area of approximately 734,478km2, including parts of forage, food, medicine and timber. A great diversity of the states of Piauí, Ceará, Rio Grande do Norte, forms of caatinga is found, distinguished by the Paraíba, Pernambuco, Alagoas, Sergipe, Bahia, and geomorphological landscape and in the geologic Minas Gerais. This biome is dominated by one of the characteristics were they occur. Floristic and 1 Universidade Federal Rural de Pernambuco, Departamento de Biologia, Área de Botânica, Laboratório de Etnobotânica Aplicada, Rua Dom Manoel de Medeiros s/n, Dois Irmãos, CEP 52171-900, Recife, PE, Brasil (www.ufrpe.br/lea) 2 Corresponding Author: [email protected] 18 Silva & Albuquerque: Woody medicinal plants of the caatinga in the state of Pernambuco (Northeast Brazil) phytosociological studies founded expressive variation represented good-published information available on in diversity and structure in different geomorphological woody plant species composition at local level conditions (Oliveira et al. 1997; Rodal et al. 1998; (Tab. 1). Araújo & Martins 1999). Data Analysis - Only the trees identified up to the In relation to medicinal plants, there are few species level were selected for the data analysis; for studies that enable a wider vision of the great diversity each one the Relative Density (RD), Relative of species used by the population for therapeutic Frequency (RF), Relative Dominance (RDO), and the purposes. Much of the traditional knowledge about Importance Value Index (VI) data were used. With plants, especially medicinal plants, is being lost with the original list obtained, information was compiled time, either because of the lack of studies or by the about the medicinal uses of each species using the inadequate use of plant resources. Some plant species available literature (for example: Braga 1960; Di Stasi of the caatinga suffer great pressure due to the et al. 1989; Agra 1996; Albuquerque et al. 2005; absence of sustainable management techniques for Almeida & Albuquerque 2002; Albuquerque & their use, and threaten to disappear from the native Andrade, 2002a,b), as well as web sites. flora. According to Lima (1999), in addition to the For each plant species, the Relative Importance innumerable reasons for the conservation of the was calculated (Bennett & Prance 2000), with the caatingas (based on the preservation of genetic exception of Cedrela odorata L. and Aspidospema diversity and on its importance for other natural pyrifolium Mart., for which only a reference to their resources such as soil, water, and fauna), the medicinal properties was found, without a precise extractivist value of this ecosystem is especially crucial indication of the types of uses. In this calculation, “2” in regions where agricultural activities (such as constant is the greatest value that a species can attain: fires, soil use, and wood extraction for different purposes) are common. RI = NCS + NP, where: This study aims to analyze, from an ethnobotanical RI = relative importance; perspective, the relative importance of some known NCS = number of corporeal systems. It is given by the medicinal species that occur in the caatinga of number of corporeal systems treated by a species Pernambuco by relating this data with some (NSCS) over the total number of corporeal systems phytosociological parameters. Were used here plant treated by the most versatile species (NSCSV). surveys conducted in six different localities: Ibimirim, Buíque, Caruaru, Poço do Ferro (municipality of NCS = NSCS Floresta), Baixa do Favaleiro (municipality of Floresta), NSCSV and Custódia. Ibimirim, for example, was selected NP = number of properties attributed to a specific because it represents the typical flora and vegetation species (NPS) over the total number of properties from Pernambuco’s sedimentary plateaus; and Buíque attributed to the most versatile species (NPSV): because floristically is most similar to the spiny NP = NPS caducifolious caatinga vegetation, found in areas of NPSV sandy substrates, due to a group of species widely From the list of species, two presence or absence distributed among that type of vegetation. The other matrices were created: one considering all the woody areas are also important considering the variation in species and the other solely considering the species the vegetation structure and physical environment. At for which medicinal properties were reported. In the moment, 322-339 woody species have been registered next step the similarity between each area was for the caatinga flora (Sampaio 1995; Rodal & Melo calculated (Jaccard’s coefficient). The cluster analyses 1999). The selected areas have about 23-192 plant were processed by the UPGMA method (Unweighted species (including woody). Pair Group Method with Arithmetic Mean) using the NTSYS-PC, version 1.8 (Rohlf 1993). Material and methods Linear correlation analysis was performed using the software Statistica 5.0. The Relative Importance Study sites - This work started with a survey of floristic of each species was used in this analysis, as well as and phytosociological studies undertaken in the state the phytosociological analysis, where it was attempted of Pernambuco. Studies were selected from six to verify an association between the different different areas of the state. These plant surveys variables. Acta bot. bras. 19(1): 17-26. 2005 19 Table 1. Main characteristic
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