The botanical genus of the common sunflower is Helianthus. The common sunflower’s full scientific name is Helianthus annuus, placing it in the daisy family, Asteraceae.
Helianthus comes from Greek words meaning “sun” and “flower.” The genus contains roughly 70 species, including annual and perennial sunflowers native mainly to North and South America. Their flower heads are actually composite structures made from many tiny florets.
The common sunflower was domesticated in North America thousands of years ago. Indigenous peoples used it for food, oil, dye, medicine, and other purposes before it spread widely through Europe and later became a major oilseed crop.
A common mix-up is treating “sunflower” as a species name. It is a general common name used for several Helianthus species, while Helianthus is the genus. The familiar head also does not consist of one giant flower: its outer ray florets and inner disk florets work together as one inflorescence.