Which genus contains more species, Pachystachys or Mazus?
Pachystachys: Pachystachys is a genus of 12 species of flowering plants in the family Acanthaceae, native to rainforest in the Caribbean and Central and South America. Mazus: Mazus is a genus of low-growing perennial plants. Mazus:  Consisting of around 30 species, this genus is generally found in damp habitats in lowland or mountain regions of China, Japan, Southeast Asia, Australia and New Zealand.
Mazus