Edraianthus (rock bells or grassy bells) is a small genus of flowering plants in the bellflower family Campanulaceae.
 "Edraianthus" species are native to mountains of the Balkan, including Croatia, Bosnia and Serbia, and as far as Romania, Italy and Greece.
Mitchella is a genus of flowering plants in the Rubiaceae family.
 It is found from China to temperate eastern Asia, and from eastern Canada to Guatemala.
Mitchella repens (partridge berry, or squaw vine) is the best known plant in the genus "Mitchella".

Question: Mitchella and Edraianthus are both a genus of what?
Answer: flowering plants