The causal dependence of present plant knowledge on herbals—Contemporary medicinal plant use in Campania (Italy) compared to Matthioli (1568)
2010
Leonti, Marco | Cabras, Stefano | Weckerle, Caroline S. | Solinas, Maria Novella | Casu, Laura
Aim of the study: Plant use has been the subject of many codices, documents and books and still is the subject of many scientific articles, trivial books and brochures. These texts, both historical and recent, exert a strong influence on local plant use, a means of knowledge transmission in particular European studies neglect to consider. Therefore, we determine the causal influence of historical texts on present medicinal plant knowledge using the example of and contemporary ethnobotanical literature from Campania. Materials and methods: We used Bayesian statistical inference and in particular the Bayesian Additive Regression Trees (BART) model to determine the causal effect of Matthioli on contemporary medicinal plant use in Campania. Results: The estimation of the average increment of finding a plant species mentioned for a certain use category caused by Matthioli is about 20%, conditionally on the available data. Matthioli's effect is not negligible and lies between 14 and 25% with a high probability. Conclusions: Studies on contemporary medicinal plant use in Europe over the last two to three decades still include the knowledge of the texts from the Renaissance and the classical writers. To what extent the remaining 80% contain autochthonous knowledge is difficult to assess. Considering the long-lasting effect of Matthioli, more recent books, brochures and newspapers very likely also exerted an influence. As well, television and radio reports on the results of pharmacological and clinical studies and, more recently, the world wide web show an ever-increasing influence.
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