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This work compiled Brazilian articles regarding medicinal plant use by  local communities in order to analyze the most common sampling problems and if  research characteristics can influence on the presence of sampling irregularities. We  focused on studies about medicinal plants that exhibit a species-indications list and had  a quantitative nature. The proportion of works with and without sampling problems was  evaluated considering the journal impact factor, period of publication, community status(urban x rural), type of sample, presence of hypothesis testing and presence of research  questions. We found that an alarming proportion of papers had some kind of sampling  problems (48.39% serious and 19.35% moderate). The most common problems were  related to: lack of information regarding the sample size or the universe, small sample  sizes and selection of specialists based on obscure criteria. We could not find a  significant influence between our tested variables and the occurrence of sampling  problems, except for the community status (urban x rural). Results indicate that a  significant amount of intracultural diversity is not being properly captured, considering  both the population as a whole and a group of interest in the community (e.g. healers).Fil: Madeiros, Patrícia. Universidade Federal Rural Pernambuco; BrasilFil: Ladio, Ana Haydee. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación En Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Albuquerque, Ulysses P.. Universidade Federal Rural Pernambuco. Departamento de Biologia. Laboratorio de Etnobotanica Aplicada; Brasi

Sampling problems in Brazilian research: a critical evaluation of studies on medicinal plants