Helianthus annuus

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Helianthus Annuus

Sunflower is the common name of one of the plants in the Helianthus genus in the flowering Asteraceae family (known as the asters, daisies, or sunflower family).

Helianthus Annuus

It is also often used explicitly about the annual Helianthus annuus, the common sunflower characterized by large flower heads (inflorescences) and a long stem. The Helianthus genus comprises more than 50 sunflower species[1], all native to North America.

Asters Flower

Helianthus annuus has an erect, thick, and hairy stem that forms a large inflorescence. The plant has large, broad lower leaves that are oval and alternately arranged on the stem, and narrower, smaller upper leaves that are individually attached to the stem.

Helianthus Annuus Flowers

The inflorescence is a large disc with a 10 to 30 cm diameter and consists of 16 to 30 golden yellow florets. Sunflowers are annual plants harvested after a growing season and can reach heights of 1 to 3.5 m (3.3 to 11.5 ft).

Suggested Reading: All types of flowers

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BioExplorer.net. (2021, November 28). Helianthus annuus. Bio Explorer. https://www.bioexplorer.net/plants/flowers/helianthus-annuus/.
BioExplorer.net. "Helianthus annuus" Bio Explorer, 28 November 2021, https://www.bioexplorer.net/plants/flowers/helianthus-annuus/.
BioExplorer.net. "Helianthus annuus" Bio Explorer, November 28 2021. https://www.bioexplorer.net/plants/flowers/helianthus-annuus/.
Key References
  • [1]“ITIS – Report: Helianthus annuus”. Accessed November 17, 2021. Link.

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