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:
Banksia hookeriana Banksia hookeriana, commonly known as Hooker's banksia, is a species of shrub of the genus "Banksia" in the family Proteaceae. It is native to the southwest of Western Australia and can reach up to 4 m high and 3 m wide. This species has long narrow serrated leaves and large, bright flower spikes, initially white before opening to a bright orange that appear over the cooler months. The flowers are pollinated by honeyeaters. The ageing flower spikes develop woody seed pods known as follicles. "B. hookeriana" is serotinous — large numbers of seeds are stored in the plant canopy for years until the plants are burnt by bushfire.