Rehmannia and Cunninghamia are both native to what country?
Rehmannia: Rehmannia is a genus of six species of flowering plants in the order Lamiales, endemic to China. Cunninghamia: Cunninghamia is a genus of one or two living species of evergreen coniferous trees in the cypress family Cupressaceae. Cunninghamia:  They are native to China, northern Vietnam and Laos, and perhaps also Cambodia.
China