Costus

Costus is the root of the thistle plant Dolomiaea costus, found in India, Southeast Asia, and China. The root is used for medicinal or homeopathic purposes, and its essential oil is used in perfumes, incense, and hair washing. It has a strong, lingering aroma that initially smells like violet but changes over time into a more unpleasant, goat-like odor. Another use for the plant is in incense sticks. In perfumery, its scent profile is often described as sensual yet slightly dirty, reminiscent of unwashed hair.