Ключевые слова: agent, allergen, allergenic, allergies, allergy, ambrosia, asthma, autumn, background, blackboard, blooming, care, causing, chalkboard, dangerous, disease, fever, flat, flora, flowering, genus, green, grey, health, illness, inflorescence, invasive, lay, medical, medicine, nature, noxious, object, plant, pollen, ragweed, reaction, seasonal, seed, spring, stone, strong, summer, table, top, toxin, view, weed, wild, word,