Which plant has the highest number of species in  Hottonia or Spiraea
Hottonia Hottonia is a genus of aquatic flowering plants in the family Primulaceae. It comprises two species:
Paeonia broteri Paeonia broteri is a perennial, herbaceous species of peony. It is an endemic species of Spain and Portugal. It bears rose-pink flowers about 12 cm wide and glossy green leaves. It reaches up to 40 cm in height. Its common name in Portugal is rosa-albardeira, and in Spain albardera and matagallinas (also used for "Daphne gnidium" and "Solanum dulcamara").