Diagnostic features the dioecious plant, Salix glauca. 

A. Branch of male plant showing maturing staminate catkins. B. Mature leaves. Surface shows impressed secondary veins and glands along leaf margin (i.); underside shows secondary and tertiary veins, villous-tomentose surface and glands. Variable morphology of leaf apices (iii.), bases (iv.) and stipules (v.). New buds form at the base of mature leaves (vi.). C. Staminate catkin with dissection of apetalous staminate flower bract (i.) and stamen with abaxial and adaxial nectaries (ii.). D. Female branchlet with persistent catkin from previous season (i.). E. Twig showing winter basal bud scales (i.), surface texture (ii. and iii.), and emergence of new growth in spring (iii.). F. Habit of female plant in winter (persistent catkins).  G. Branch of juvenile female plant showing maturing pistillate catkins. H. Pistillate catkin with dissection of apetalous pistillate flower with adaxial nectary (i.) and bract (ii.). I. Mature pistillate catkin with detail of ovary (i.) and bract (ii.) in two orientations. J. Persistent catkin in winter. K. Dehiscence of mature fruit showing the release of seeds and wind dispersal (anemochory).