Photinia ( ) is a genus of about 40–60 species of small trees and large shrubs, but the taxonomy has recently varied greatly, with the genera "Heteromeles", "Stranvaesia" and "Aronia" sometimes included in "Photinia".
Nandina domestica ( ) commonly known as nandina, heavenly bamboo or sacred bamboo, is a species of flowering plant in the family Berberidaceae, native to eastern Asia from the Himalayas to Japan.
 It is the only member of the monotypic genus Nandina.

Question: Which genus has more species, Nandina or Photinia 
Answer: Photinia