Genus Epilobium is a group of flowering plants that belong to the family Onagraceae. These plants are commonly known as willowherbs, fireweeds, and evening primroses. The name Epilobium is derived from the Greek words epi, which means "upon," and lobos, which means "a pod" or "fruit," referring to the way the pods sit on top of the plant's stem. These plants are known for their vibrant pink, purple, and white flowers which bloom from mid-summer to fall. Willowherbs are often used in herbal medicine for their anti-inflammatory and astringent properties. Some common species of the genus include Epilobium angustifolium, Epilobium parviflorum, and Epilobium ciliatum.