Dog's Mercury is a common woodland plant found across Europe. It forms dense carpets on forest floors and beneath hedgerows. The plant gets its name from the Roman god Mercury, who was believed to have discovered its medicinal properties. Dog's Mercury has straight hairy stems that can reach 15 inches tall. It has spear-shaped green leaves that give off a foul odor. The plant thrives in alkaline soils and full shade. While it was once used medicinally, Dog's Mercury is highly toxic if consumed, causing vomiting, pain, and even death in large doses.