The willow tree is a type of deciduous tree that is native to many parts of the world. It is known for its long, slender branches and its ability to grow in wet areas. The term 'willow tree' can be broken down into three crossword solutions: OSIER (5 letters), SALLOW (6 letters), and itea (4 letters). OSIER is an old English word for a willow tree, while SALLOW is an adjective used to describe the pale yellowish-green color of the willow's leaves. Lastly, itea is a genus of shrubs and small trees that includes the willow tree.