Azota Caballo is a tree found here in northeastern Argentina and adjacent Brazil and Paraguay.  The bark is medicinal.   In context at <a rel="nofollow" class="external text" href="http://www.dixpix.ca/Amazon/flora/malves/index.html">www.dixpix.ca/Amazon/flora/malves/index.html</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/92252798@N07">Dick Culbert</a> from Gibsons, B.C., Canada
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/92252798@N07/17160519391/">Luehea divaricata</a>