Shade levels on yield and chemical composition of the leaf essential oil of Pothomorphe umbellate (L.) Miguel - Ming, Chau L. [UNESP]; Souza, Mattana R. [UNESP]; Vieira, Aparecida Ribeiro M. [UNESP]; Ferreira, Balbino A. [UNESP]; Marques, Ortiz Mayo M. [UNESP]; Marchese, Abramo J. (Georg Thieme Verlag Kg, 2012)