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Sunflower is an annual herbaceous plant of the Asteraceae family.1 to 3.5 meters high.The stem is upright, round and angular, hard and covered with white coarse hairs.The broad ovate leaves are usually alternate, with sharp or acuminate apex, 3 veins at the base, coarsely serrated edges, rough hairs on both sides, and long stalks.Flower heads, 10 to 30 cm in diameter, solitary on stem tops or branch ends.