Loch, V. do C., Marques, G.E. de C., Rocha, A.E., Nascimento, D.S.B. and Costa, M.C.C. de A. 2018. Study of plant genetic resources for medicinal purposes in transition areas in the state of Maranhão, Brazil. Revista de Biologia Neotropical / Journal of Neotropical Biology. 14, 1 (Feb. 2018), 45–55. DOI:https://doi.org/10.5216/rbn.v1i1.42205.