Are Daviesia and Rehmannia native to the same countries?
Rehmannia Rehmannia is a genus of six species of flowering plants in the order Lamiales, endemic to China.
Sagittaria Sagittaria is a genus of about 30 species of aquatic plants whose members go by a variety of common names, including arrowhead, duck potato, katniss, "Omodaka" (沢瀉 in Japanese), swamp potato, tule potato, and wapato (or wapatoo). Most are native to South, Central, and North America, but there are also some from Europe, Africa, and Asia.