Effect of essential oils on the coagulation of human plasma induced by Bothrops and Lachesis snake venoms after previous incubation of citrated human plasma at 37°C with different volumes of essential oils extracted from rhizomes and leaves of H. coronarium , followed by addition of the venoms of Lachesis muta , B. moojeni and B. atrox (50 μ g/mL). (A) Lachesis muta inducing clotting. (B) Bothrops moojeni inducing clotting. (C) Bothrops atrox inducing clotting. Mean values of the clotting time followed by the same letter, in uppercase to compare the essential oils analyzed and in lowercase for comparison between volumes of the same essential oil, do not differ significantly at 5% probability by the Scott-Knott test.