There is a legend of rivalry between Ossâim, the orixá of medicine and leaves, and Iansã, the orixá of stars, winds, and storms. Everything began as a result of jealousy. Iansã went to visit Ossâim. Ossâim is very reserved, quiet, silent. Iansã wanted to know what he was doing. When Ossâim has the opportunity, he explains things. But Iansã is always rushed, she wants everything done immediately. She is always asking questions, and she needs to know everything that’s going on. When Iansã arrived at the house of Ossâim, he was busy working with his leaves. It happens that there are certain types of work with leaves that you can’t talk about, you need to remain silent. Iansã started asking, ‘What are you doing? Why are you doing this?, Why are you doing that?’ And Ossâim remained silent. ‘All right, if you don't want to tell me what you’re doing, then I'll make you talk’.
That’s when Iansã began to shake her skirt and make the wind blow. The house of Ossâim is full of leaves, with all of their healing properties, and when the wind began to blow, it carried the leaves in every direction. Ossâim began to shout ‘Ewe O, Ewe O’ [Yoruba—my leaves, my leaves]. Ossâim then asked the help of the orixás to collect the leaves, and the orixás went about gathering them. And it happens that every leaf that an orixá collected, every species, he or she became the owner of that leaf.