Grains of Weedy Rice (image) Washington University in St. Louis Share Print E-Mail Caption Seeds of blackhull awned weedy rice, which are unpalatable, evolved from a domesticated crop variety. Credit Ken Olsen Usage Restrictions Please credit. Share Print E-Mail 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.