Which genus has more species, Nandina or Photinia 
Nandina:  It is the only member of the monotypic genus Nandina. Photinia: 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".
Photinia