1. Branchlet in a flowering time with male catkins (a - d), female catkins (e, f), stalked vegetative buds (k) and ripe conelets from a previous year (l - o). - 2. Branchlet with leaves (in summer), immature fruits (a - c), young male catkins (d, f) and stipules (n) at the leafbases. - 3. Winter-branchlet with stalked vegetative buds (k). - 4. Winter-branchlet with closed male catkins (g - i, p), and female catkins (r - t). - 5. Fruits (small winged nuts) viewed here from different sides. - 6. Seedling with cotyledons and first leaves. After Hempel & Wilhelm, 1889. Photos and explanations from the book: Zelimir Borzan. "Tree and Shrub Names in Latin, Croatian, English, and German, with synonyms", University of Zagreb, 2001.