Coincya is a genus of flowering plant that belongs to the family Brassicaceae. Three species of the plant are endemic to the British Isles., these being Coincya wrightii (Lundy Cabbage), Coincya cheiranthos (nokkasinapit) and Coincya monensis, which has two subspecies, C. monensis subsp. monensis (Isle of Man cabbage) and C. monensis subsp. recurvata (Star mustard).