155-year-old waterhemp specimen (IMAGE) University of British Columbia Caption A 155-year-old waterhemp herbarium specimen from the Missouri Botanical Garden Herbarium. Credit Julia Kreiner, University of British Columbia. Usage Restrictions n/a License Original 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.