Wolfsbane

Wolfsbane is perennial Alpine woodland wildflower and a member of the toxic aconite family. It grows to about 3 feet tall, spreads out in clumps and produces lovely spikes of ivory, green or bright yellow pitcher-shaped flowers from spring to midsummer. The bright green leaves are palmately shaped and deeply lobed and toothed.

Effect on Werewolves
While being toxic to humans, Wolfsbane can in fact be used to treat some of the symptoms of lycanthropy if prepared correctly. However, the average werewolf (in both human and wolf form) will express an extreme fear and revulsion to the plant, both picked, growing wild, and as an ointment.