California Wild Radish (IMAGE) University of California - Riverside Caption The California wild radish is descended from hybrids between two species: cultivated radish and the weed, jointed charlock. Credit S. Hegde, UCR. 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.