More flowers from this strange tree.  The calyx is not visible; the corolla is the reflexed outer whorl. The other bits are modifications and appendages on the stamens. A large flat stigma is visible in the center.  Biology Dept. greenhouse, Florida International University, Miami, Florida, USA. Biology Dept. greenhouse, Florida International University, Miami, Florida, USA.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Napoleonaea_imperialis.jpg" title="File:Napoleonaea imperialis.jpg">Napoleonaea_imperialis.jpg</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/12017190@N06">Scott Zona</a> from Miami, Florida, USA</li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Bff" title="User:Bff">Bff</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Bff" title="User talk:Bff"><span class="signature-talk">talk</span></a>)</li></ul>
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