Which genus contains more officially recognized species, Oplismenus or Abrus?
Oplismenus:  The systematics of the genus are unclear, with over 100 described species, only 7 species are officially recognized as of October 2015. Abrus: Abrus is a genus of flowering plants in the pea family, Fabaceae and the only genus found in the tribe Abreae. Abrus:  It contains, 13–18 species, but is best known for a single species, Jequirity ("A. precatorius").
Abrus