Fly Pollinator Visiting a Female Flower of Thalictrum pubescens (image) University of Toronto Share Print E-Mail Caption Fly pollinator visiting a female flower of Thalictrum pubescens (tall meadow-rue). Females of this species produce stamens with sterile pollen grains, presumably to reward pollinators. Credit David Timerman 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.