Do Sinningia or Elodea have more species?
Sinningia: Sinningia is a genus of flowering plants in the family Gesneriaceae. Sinningia:  There are about 65 species of tuberous herbaceous perennials, all occurring in Central and South America, with the greatest concentration of species occurring in southern Brazil. Elodea: Elodea is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803.
Sinningia