Epilobium hirsutum is a flowering plant commonly known as great willowherb or hairy willowherb. The plant belongs to the Onagraceae family and is native to Eurasia, but it can now be found in many other regions of the world. Besides the common names, there are a few synonyms for Epilobium hirsutum, including Epilobium angustifolium, Epilobium hirsutum subsp. montanum, Chamaenerion hirsutum, and Chamerion angustifolium. These synonyms are often used interchangeably to refer to the same plant. Epilobium hirsutum has many medicinal uses and is known for its anti-inflammatory and antioxidant properties, making it a popular herb in traditional medicine.