Bursera silviae, collected in the coastal area of the state of Oaxaca, and B. toledoana, known from the lower part of the Balsas River Depression in the states of Guerrero and Oaxaca, are described as new and illustrated. The first one is related to B. palaciosii Rzed. & Calderón and to B. staphyleoides McVaugh & Rzed., but differs in being a strongly aromatic plant, in its flowers tinged with red and the male ones almost always trimerous. The second is similar to B. multifolia (Rose) Engl. and to B. suntui C. A. Toledo, but distinct in being glabrous from the earliest stage of the leaves and in its larger flowers with the male ones being almost always pentamerous.
