Calendula

Calendula or pot marigold, is a genus of about 15–20 species of annual and perennial herbaceous plants in the daisy family Asteraceae. They are native to southwestern Asia, western Europe, Macaronesia, and the Mediterranean. Other plants are also known as marigolds, such as corn marigold, desert marigold, marsh marigold, and plants of the genus Tagetes. The name calendula is a modern Latin diminutive of calendae, meaning "little calendar", "little clock" or possibly "little weather-glass". The common name "marigold"  refers to the Virgin Mary. The most commonly cultivated and used member of the genus is the pot marigold (Calendula officinalis).
Popular herbal and cosmetic products named 'calendula' invariably derive from C. officinalis.
Ancient cultures recognized and used the healing properties of calendula. In some of the earliest medical writings, calendula was recommended for treating ailments of the digestive tract. It was used to detoxify the liver and gall bladder. The flowers were applied to cuts and wounds to stop bleeding, prevent infection and speed healing. Calendula was also used for various women's ailments, and to treat a number of skin conditions. During the American Civil War, calendula flowers were used on the battlefields in open wounds as antihemorrhagic and antiseptic, and they were used in dressing wounds to promote healing. Calendula also was used in this way during World War I. Calendula has been historically significant in medicine in many cultures, and it is still important in alternative medicine today.