Alkanna tinctoria, a plant whose root is used as a red dye.
The dyeing matter extracted from the plant, giving a deep red colour.
Other plants of the genus Alkanna.
Anchusa officinalis (common bugloss), a similar plant.
Anchusa ochroleuca (yellow alkanet).
Anchusa barrelieri (false alkanet).
Lithospermum arvense (bastard alkanet or field gromwell).
Pentaglottis sempervirens (green alkanet), a blue-flowered plant with evergreen leaves.
Puccoon (Sanguinaria canadensis).