1. Branchlet with young shoots, male (a, b) and female (c, d) inflorescences. Typically several female flowers develop with each long, slender peduncles. - 2. Branchlet with mature shoots and almost ripe fruits (acorns). - 3. Ripe acorn, at the end of the first season. - 4. Peduncle with empty cup (a) and aborted fruits (b, c). - 5. Winter-branchlet; buds are egg-shaped, roundish at the top. 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.