Willow trees fall under the Salix genus and include over 400 species, with two of the most well-known medicinal species being the white willow (Salix alba) and the black willow (Salix nigra).

This week, we meet Black willow or Salix nigra ... The finely toothed leaves are medium green in the spring, changing to yellow-green in the fall. The bark on young trees is smooth, but may be warty ...