Willow trees fall under the Salix genus and include over 400 species, with two of the most well-known medicinal species being the white willow (Salix alba) and the black willow (Salix nigra).

The long history of aspirin and other pain relievers emphasizes ... Hippocrates also championed the chewing of willow bark for pain relief. In England in 1763, the Reverend Edward Stone published ...

For example, willow bark was used by the ancient Greeks to ... This was modified by chemists into the substance we call aspirin, which is less irritating to the stomach than salicylic acid.

For example, willow bark was used by the ancient Greeks to ... This was modified by chemists into the substance we call aspirin, which is less irritating to the stomach than salicylic acid.