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.
Rafflesia verrucosa Rafflesia verrucosa was first identified and characterized during a small mammal survey of Mt. Kampalili in eastern Mindanao in 2010. "R. verrucosa" is the tenth species of "Rafflesia" found in the Philippines. "Rafflesia" species have rare and unusual flowers known for their large size and pungent smell. Some plant enthusiasts like Frits W. Went have gone to extreme measures to see these plants in bloom. Went detailed his search for "Rafflesia" saying, "I had heard, when I was in Java many years ago, that "Rafflesia" were to be found on an offshore island named Nusah Kembangan. This was in 1929, when it was a penal colony for major criminals. My driver on this occasion was a convicted murderer, and my guide was serving time for cannibalism." The small size and interesting morphology of "Rafflesia verrucosa" make it one of the most unusual "Rafflesia" species. It is the smallest flowered "Rafflesia" species described from Mindanao. The other two, "R. mira" and "R. schadenbergiana", are some of the largest in the genus.