| Noun | 1. | willow family - two genera of trees or shrubs having hairy catkins: Salix; Populus hamamelid dicot family - family of mostly woody dicotyledonous flowering plants with flowers often unisexual and often borne in catkins order Salicales, Salicales - coextensive with the family Salicaceae genus Salix, Salix - a large and widespread genus varying in size from small shrubs to large trees: willows genus Populus, Populus - a genus of trees of the family Salicaceae that is found in the northern hemisphere; poplars |