Description:
1. Flowering shoot with male (a - c) and female (d, e) catkins. - 2. Branchlet with close to mature (a), and mature (b, c) fruit clusters and immature male catkins (d). - 3. Bladder-like flat involucre as viewed from inner (adaxial) side (a), and in cross section laterally (b). - 4. Fruit is a nut. - 5. Seedling with cotyledons and first alternate leaves. - 6. Winter-branchlet with male catkins (a). 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.