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:
Hypericum fieriense Hypericum fieriense is a species of flowering plant in the family Hypericaceae. It is endemic to Socotra, an island archipelago that is part of Yemen. It grows in mountain shrubland dominated by "Cephalocroton", where it can be found with the endemic tree "Dracaena cinnabari". It is rarer than other local shrubby "Hypericum" species. It can be distinguished from them by its pubescent herbage.