Wallflower flowers (Erysimum cheiri). The essential oil of this plant is sometimes used in herbal medicine as a nervine tonic, though large doses may

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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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Size: 4072px × 2712px
Photo credit: © COLIN CUTHBERT/DILSTON PHYSIC GARDEN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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