Willow trees (many varieties) contains acetylsalicylic acid, more commonly known as aspirin.
If needed, a couple of leaves can be chewed and held between your cheek and gum, allowing the acetylsalicylic acid to be absorbed. Leaves may also be brewed into a tea. Bark may also be chewed.
Acetylsalicylic acid may be used as an analgesic to relieve minor aches and pains, as an antipyretic to reduce fever, and as an anti-inflammatory medication.
Bark may be stripped off branches and used to make cordage. Flexiable wood