This hibiscus is native to the wet forests of O`ahu, Kauai and the Big Island.  It was designated as the Hawaii State flower in 1923 and remained so until 1988 when it was replaced by the native yellow.  The oval leaf has rounded tooth edges and a waxy surface.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/28567825@N03">Cliff</a> from Arlington, Virginia, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nostri-imago/2857469567/">Native Red Hibiscus (Hibiscus kokio): Koki`o `ula`ula</a>