Specimen of Rhododendron ponticum (IMAGE) University of Cambridge Caption Herbaria contain records of invasive plants, pests, and diseases moving into and across regions and between species. This specimen of the invasive, non-native Rhododendron ponticum was collected by the great British botanist and ecologist Oliver Rackham when he was just 15 years old. Credit Cambridge University Herbarium Usage Restrictions With credit 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.