described, and the importance value (IVI) and the modified forest value (IVFm) indices were calculated. Diversity was analyzed using indices of Shannon-Wiener (H'), Simpson (S) importance and forest values Haematoxylum campechianum L. in SBSP, Clusia salvinii Donn Sm. in SMP and Brosimum alicastrum Sw. in SAP. Three vertical layers were identified: below (< 4 m; < 5 m), medium (4 to 9 m; 5 to 8 m) and upper (> 8 m; > 9 m up to 25 and 38 m) in the SMP and SAP, in the SBSP a single layer (12 m) was found. Diversity of tree species was significantly (p < 0.01) higher in SAP (H' = 3.21) compared to SMP (H' = 2.19) and SBSP (H' = 0.91). Floristic similarity among UM was higher in SBSP (IS = 58.5 to 79.9%) compared to SAP (23.5 to 48.1%) and SMP (1.1 to 35%). In this study the major species and the floristic composition for each tropical forest are recognized, which is expected to be useful in future research and thus contribute to define conservation, reproduction and sustainable use strategies of these tropical forests.