Betula pendula Height: up to 20 m Trunk: strikingly white (betulin), smooth bark, cracking and darkening with age Leaves: diamond-shaped to triangular, 4-7 cm long, hairless Fruits/seeds: 2-3 cm long catkins Other: overhanging branches, covered with small cork warts Photos: Janina Deutschmann (1,2), Kerstin Ellersdorfer (3)