Intertaxon relationships
Anchusa azurea Mill. - Garden Anchusa 
Cynoglossum officinale L. - Common Hound's-tongue
Echium vulgare L. - Viper's-bugloss
Lithospermum L. - stoneseed
Myosotis L. - forget-me-not
Pulmonaria officinalis L. - Common Lungwort
Symphytum officinale L. - Common Comfrey