1 of Robertson's Bees on 1 of Robertson's Flowers (image) Washington University in St. Louis Share Print E-Mail Caption Pictured are Andrena erigenia on Claytonia virginica. A bee species named and collected by Robertson 120 years ago, Andrena erigenia was also collected by Marlin 40 years ago and by Knight and Burkle in 2009-2010. By washing archival specimens of the bees, Knight and Burkle were able to study the pollen the bees were carrying when they were collected in the field. Credit Courtesy Photo Usage Restrictions None 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.