What you want to ask is the name of the root of red citronella? Datian base is yellow. The root color of citronella is red, which is red silk hairy root, also known as Datian yellow. It has the effects of clearing away heat, promoting diuresis (eliminating damp-heat in the body), cooling blood, promoting blood circulation, detoxicating and reducing swelling, and can be used for treating jaundice, diarrhea, conjunctival congestion and hematemesis. Citronella, also known as citronella, is a perennial dense aromatic herb of Gramineae and Citronella.