Which plant has the highest number of species in  Hottonia or Spiraea
Spiraea Spiraea , is a genus of about 80 to 100 species of shrubs in the family Rosaceae. They are native to the temperate Northern Hemisphere, with the greatest diversity in eastern Asia.
Stylochaeton Stylochaeton is a genus of flowering plants in the Araceae family that is endemic to Africa. "Stylochaeton" are rhizomatous with hastate leaves. Flowering in this genus is said to be quite uncommon.