In the book of Revelations, 8:11, "And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter."

Mugwort is part of the wormwood family of plants. There is a town in Ukraine named after the plant. The Ukrainian phrase for mugwort is "black grass" or Чорнобиль - Chornobyl.

Coincidence? I think so!