Betula spp. Height: up to 20 m Crown: usually narrow Trunk: strikingly white (betulin), smooth bark, cracks and darkens with age Leaves: diamond-shaped to triangular, ovate, 4-7 cm long Fruits/seeds: elongated catkins Other: very thin, fine twigs, often drooping Photos: Janina Deutschmann (1,2), Kerstin Ellersdorfer (3)