Ключевые слова: alder, alder tree, alnus, alnus glutinosa, background, beautiful, bloom, blossom, blue, botany, branch, bright, brown, catkin, catkins, close, close up, closeup, common alter, cone, cones, detail, european, flora, flower, forest, fresh, garden, growth, hanging, inflorescence, macro, mature, natural, nature, outdoor, outdoors, plant, pollen, season, seed, sky, spring, tree, twig, up, wild, winter, wood, yellow,