Colletia is a genus of flowering plants in the family Rhamnaceae, with 15 to 17 species of spiny shrubs. All species of this genus are native to southern South America.
 They are non-legume nitrogen fixers.
Discaria is a genus of about 12 species of flowering plants in the family Rhamnaceae, native to temperate regions of the Southern Hemisphere, in Australia, New Zealand and South America.

Question: Which genus has more species Colletia or Discaria?
Answer: Colletia