Matanna, R.S Vieira, M.A.R. Marchese, J.A. Ming, L.C. Marques, M.O.M. Shade level effects on yield and chemical composition of the leaf essential oil of Potbomorphe umbellata (L.)Miquel Subjects--Topical Terms: PLANTA MEDICINALSOMBREAMENTOCOMPOSIÇÃO QUÍMICAÓLEO ESSENCIAL