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The foliage of Common Comfrey is somewhat similar to other species in the Borage family, particularly Lithospermum latifolium (American Gromwell), Lithospermum officinale (European Gromwell), and Borago officinalis (Borage). However, the flowers of Common Comfrey have campanulate (bell-shaped) corollas with open throats, while the flowers of American Gromwell and European Gromwell have narrow throats. The flowers of Borage are even more distinct with their widely spreading petals and sepals; these flowers are also wider, spanning about ¾-1" across when they are fully open.

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© John Hilty

Source: Illinois Wildflowers

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