Noun
any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays
Source: WordNet"Many people are under the misconception that the flower heads of the cultivated sunflower (Helianthus annuus) track the sun.. Source: Internet
In some species, however, the pappus falls off (for example in Helianthus ). Source: Internet
Wild Helianthus annuus is a widely branched annual plant with many flower heads. Source: Internet