is a specific kind of: tree.

is a broader term that covers: osier | Huntingdon willow, Salix alba, white willow | Salix alba sericea, Salix sericea, silky willow, silver willow | cricket-bat willow, Salix alba caerulea | arctic willow, Salix arctica | Babylonian weeping willow, Salix babylonica, weeping willow | Salix blanda, Salix pendulina, Salix pendulina blanda, Wisconsin weeping willow | pussy willow, Salix discolor | sallow | almond-leaves willow, peach-leaved willow, peachleaf willow, Salix amygdaloides | hoary willow, sage willow, Salix candida | brittle willow, crack willow, Salix fragilis, snap willow | prairie willow, Salix humilis | dwarf willow, Salix herbacea | gray willow, grey willow, Salix cinerea | arroyo willow, Salix lasiolepis | Salix lucida, shining willow | black willow, Salix nigra, swamp willow | bay willow, laurel willow, Salix pentandra | balsam willow, Salix pyrifolia | creeping willow, Salix repens | Salix sitchensis, silky willow, Sitka willow | dwarf gray willow, dwarf grey willow, sage willow, Salix tristis | bearberry willow, Salix uva-ursi ... show more.

is a member of: genus Salix, Salix.