Zingiber flower (IMAGE) Smithsonian Tropical Research Institute Caption Zingiber flower. Flowers began to diversify long ago, but only after the asteroid impact that killed the dinosaurs did flowering plants take over tropical forests. Today Colombia, where this study was done, is one of the most biodiverse countries in the world. Credit Beth King, STRI Usage Restrictions none License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.