 Do  Eriophorum and Perovskia both belong to the same genus?
Eriophorum: Eriophorum (cottongrass, cotton-grass or cottonsedge) is a genus of flowering plants in the family Cyperaceae, the sedge family. Perovskia: Perovskia is a genus of flowering plants in the mint family, Lamiaceae.
i don't know