Ключевые слова: allergy, avellana, betulaceae, birch, bloom, blooming, blossom, botany, branch, bud, bush, catkin, corylus, family, fever, flora, flower, format, garden, hay, hazel, hazelnut, health, horizontal, landscape, male, nature, nut, outdoors, plant, pollen, pollination, season, shrub, spring, springtime, tree, twig, yellow,