Dichroa is a genus of flowering plants belonging to the family Hydrangeaceae. It is primarily found in the mountainous regions of Southeast Asia, particularly in countries like China and Vietnam. The most well-known species is Dichroa febrifuga, which is recognized for its medicinal properties and is often used in traditional medicine. The plants in the Dichroa genus are characterized by their large, broad leaves and clusters of small, blue or purple flowers. They typically thrive in moist, shaded environments and can grow as shrubs or small trees. Due to their unique appearance and ecological importance, they are of interest to both botanists and horticulturists.