Ragweed (IMAGE) Helmholtz Association Caption Common Ragweed (Ambrosia artemisiifolia) is the most widespread plant of the genus Ambrosia in North America. Its wind-dispersed pollen is a strong allergen to many people with hay fever. Credit Photo: Foto: Klaus-Dieter Sonntag/ fotoplusdesign.de Usage Restrictions None License Licensed 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.