Caterpillar of the Evening Primrose Moth (image) University of Toronto Caption A caterpillar of the evening primrose moth (Schinia florida) devouring a flower bud of common evening primrose (Oenothera biennis). These moths exclusively feed on the flowers and fruits of evening primrose and in response to natural selection imposed by this and other specialist moths, evening primrose populations evolve to flower later and to produce high levels of toxic chemicals called ellagitannins in their fruits. This evolution effectively reduces damage of the plant's reproductive organs and progeny. Credit Marc Johnson Usage Restrictions None 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.