Which genus has more species, Buddleja or Koelreuteria?
Buddleja: Buddleja, or Buddleia (also historically given as "Buddlea"), commonly known as the butterfly bush, is a genus comprising over 140 species of flowering plants endemic to Asia, Africa, and the Americas. Koelreuteria: Koelreuteria is a genus of three species of flowering plants in the family Sapindaceae, native to southern and eastern Asia.
Buddleja