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:
Veltheimia bracteata Veltheimia bracteata belongs to the genus "Veltheimia", which contains only one other species, "Velthemia capensis". "Veltheimia bracteata" is commonly referred to as the forest lily, sand onion, or red hot poker. This pendent shaped plant ranges in color from a yellowish pink to red. It is a winter flowering perennial plant, so is in full bloom when other flowers have withered away. Plants grow to be 12 – in height.