Chromolaena odorata is a shrub of the sunflower family native to the New World Tropics. It is an invasive weed of field crops in Africa and Asia where it has been introduced. It is now found all over tropical Asia, western Africa, and in parts of Australia. Other names for the plant include Siam weed and Christmas bush, and Common Floss Flower. It is sometimes grown as a medicinal and ornamental plant. It is used as a traditional medicine in Indonesia. The young leaves are crushed, and the resulting liquid can be used to treat skin wounds.