Willow leaves are long, narrow, and often have a pointed tip, giving them a distinctive shape. They typically grow in clusters along the branches of willow trees, which thrive near water sources. The leaves are usually green, turning yellow in the fall, and can be smooth or slightly serrated along the edges. These leaves play a crucial role in the tree's photosynthesis process, helping to convert sunlight into energy. Additionally, willow leaves are known for their medicinal properties, as they contain compounds like salicin, which is related to aspirin. This makes them of interest in herbal medicine and natural remedies.