Which genus, Shortia or Schizophragma, has more species?
Shortia:  There are five species, four in Asia and one in the Appalachian Mountains of eastern North America. Schizophragma: Schizophragma (hydrangea vine) is a genus of four species of flowering plants in the family Hydrangeaceae, native to moist woodland in Asia, from the Himalayas east to Taiwan and Japan.
i don't know