Willow

The tree is known for its abundant watery bark sap that is heavily charged with salicylic acid. Its roots spread extensively and are very aggressive in seeking out moisture. For this reason, they have become a problem as the roots are well known for clogging drains.

A small number of this species were widely planted in Australia for erosion-control measures along watercourses. They are now regarded as an invasive species and many catchment management authorities are removing and replacing them with native trees.

Its leaves and bark have been mentioned in ancient texts from Assyria, Sumer and Egypt as a remedy for aches and fever.