Chromolaena odorata, also known as Siam weed, is a perennial plant found in tropical and subtropical regions of the world. It is typically found in disturbed habitats, such as roadsides and abandoned fields, and in moist forests. This species has a wide range, from tropical America to Africa, India, and Southeast Asia. The leaves of Chromolaena odorata can be used medicinally, and the plant itself is sometimes used in traditional medicine.