Monkshood, the Flower of Treachery also known as Wolfsbane and Aconite. It's a flower native to the Western and Central Europe in the Prosaic Earth, known for its poisonous and mythical powers.
The plant can grow into an impressive one meter tall, with round leaves equally divided into five to seven deeply lobed segments in a spiral arrangement along the main stem. It's flowers are of a darkish Purple in a closed narrow oblong trumpet shape.
Monkshood has been ascribed with supernatural powers relating to werewolves and other lycanthropes, either to repel them or cure them, relating to Monkshood's use in poisoning wolves and other animals, or in some way induce their lycanthropic condition, as Monkshood was often an important ingredient in witches' magic ointments. In folklore, Monkshood was also said to make a person into a werewolf if it is worn, smelled, or eaten. They are also said to kill werewolves if they wear, smell, or eat Monkshood.
A noble who uses the Monkshood as their personal flower may perhaps be a powerful Shape-Shifter or a beast Hunter. Associated with Madness and Unanimity, this flower is commonly associated with the followers of the Code of the Wild.
Some Domains that could be associated with the Monkshood are: Autumn, Despair, Insanity, Solitude, The Hunt and The Moon.