Ammi is a genus of 3 to 6 species of plants in the Apiaceae family.
 They are native to southern Europe, northern Africa and Southwest Asia.
 "Ammi spp."
 (Bishops weed) is prohibited by the Australian New Zealand Food Standards code under standard 1.4.4 due to active constituents:
Justicia is a genus of flowering plants in the family Acanthaceae.
 There are 658 species with a further 611 species as yet unresolved by Kew.
 They are native to tropical to warm temperate regions of the Americas, India and Africa.
 Common names include water-willow and shrimp plant, the latter from the inflorescences, which resemble a shrimp in some species.
 The generic name honours Scottish horticulturist James Justice (1698–1763).
 They are closely related to "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.
 They are evergreen perennials and shrubs bearing prominent terminal spikes of flowers with brightly coloured bracts.

Question: Which genus has more species Ammi or Pachystachys?
Answer: Pachystachys