COLIN CUTHBERT / DILSTON PHYSIC GARDEN / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / DILSTON PHYSIC GARDEN / SCIENCE PHOTO LIBRARY
Wallflower flowers (Erysimum cheiri). The essential oil of this plant is sometimes used in herbal medicine as a nervine tonic, though large doses may be toxic. The plant contains cheiranthin which has a stronger effect on the heart than digitalin, a toxin found in foxglove. Photographed at the Dilston Physic Garden, Northumberland, UK.
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