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Willow Tree Classifications

There are more than 300 different species of willow, so the classification of willows is not an easy task. Additionally, many species of willow freely crossbreed, producing trees that share the characteristics of more than one species. Nevertheless, there are several prominent species of willow that are common to North America. Learning to identify these major species will help you to classify the majority of willows that you encounter.
  1. Weeping Willow (Salix babilonica)

    • The weeping willow is probably the best known willow species, and is very widely planted as an ornamental tree. It's easily identified by its distinctive, flexible, drooping branches. This Chinese native is generally found in tree rather than shrub form, and tends to grow near bodies of water. Its narrow leaves are generally 3 to 5 inches long, and taper equally at each end.

    Black Willow (Salix nigra)

    • The black willow gets its name from its dark gray to nearly black bark. It's one of the most widespread North American willow species. The black willow's leaves have a narrow shape, similar to the weeping willow's. The black willow's leaves can be distinguished because they taper much more sharply at the stem end than the tip. Weeping willow leaves taper equally at both ends.

    Pussy Willow (Salix caprea)

    • The pussy willow is best known for its silvery catkins (a cylindrical flower cluster) that are often used in decorative floral displays. The pussy willow is native to Europe and Asia and grows in both tree and shrub form. Unlike many other species of willow that have lance shaped leaves, the pussy willow's leaves have oval shapes.

    Crack Willow (Salix fragilis)

    • As its name suggests, the crack willow's most distinctive feature is its fragile twigs that easily break off. This native to Asia and Europe is similar in appearance to the black willow, but has visible circular glands at the junctions of its leaves and stems. These glands are not found in the black willow.