Salix phylicifolia, the tea-leaved willow, is a species of willow native to Northern Europe, including Iceland. It can also be found in the Faroe Islands, Scandinavia, Finland, Russia and Western Siberia. It was the first bush found on Surtsey, a new island off the south coast of Iceland, which was formed in a volcanic eruption in 1963.
Willow bark’s pain relieving potential has been recognised throughout history. It was commonly used during the time of Hippocrates, when people were advised to chew on the bark to relieve pain and fever. Willow bark contains salicin, which is similar to aspirin.