The group of which Eryngium campestre is a member and Arnebia are in the same kingdom of forms.
Eryngium is a genus of flowering plants in the family Apiaceae. 
Arnebia is a genus of flowering plants in the family Boraginaceae. 
Eryngium campestre, known as field eryngo, is a species of "Eryngium", which is used medicinally. 
