Ключевые слова: allergy, background, beautiful, beauty, betula, betula pendula, betulaceae, birch, blooming, blossom, blue, botany, branch, bright, catkin, closeup, color, environment, flower, foliage, forest, fresh, garden, green, green leaves, growth, landscape, leaf, leaves, macro, morning, natural, nature, outdoor, park, plant, rain, season, seed, silver birch, sky, spring, springtime, summer, texture, tree, twig, white, wood, young,