Ключевые слова: alder, allergen, allergenic, allergic, allergy, april, avellana, background, bloom, blooming, blossom, botanical, branch, bush, catkin, catkins, close, closeup, common, contorta, corylus, detail, early, europe, fever, flora, flower, garden, hazelnut, macro, male, mars, natural, nature, plant, pollen, pollination, scandinavia, seasonal, shrub, spring, springtime, sprout, sweden, tree, twig, wood, yellow, young,