Question: What happens if someone discards a joker, misnames it a flower and a player calls the flower for Mah Jongg. Is the Mah Jongg legit?

Answer: If a joker is misnamed, and the misnamed joker is needed for Mah Jongg, the game stops and the player who misnamed the joker pays for the table. This is the only fair thing to do, since everyone now knows that player needs a flower and no one would ever throw one.

Source: Letter from the National Mah Jongg League to a player, dated June 7, 2023.