The Dama del Monte or Painted Trumpet Vine in northern Argentina.  Also found in adjacent Paraguay, Brazil and Uruguay.
<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@N07/18624750636/">Bignonia callistegioides</a>