Which genus contains more species, Asarina or Wigandia?
Asarina: Asarina is a flowering plant genus of only one species, Asarina procumbens, the trailing snapdragon, which is native to southern Europe. Wigandia: Wigandia is a genus of flowering plants within the waterleaf subfamily, Hydrophylloideae. Wigandia:  Some are grown as ornamental plants and will flourish in most Mediterranean or temperate regions.
Wigandia