The 3"- 4” red flower is pinwheel shaped with a red staminal column and red filaments that contrast with the yellow pollen.   This flower was used by Hawaiians to make a light red dye.  It will bloom best if planted in full sun.
<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/2858298764/">Native Red Hibiscus (Hibiscus kokio) Koki`o `ula`ula</a>