Helianthus annuus L. - Common Sunflower

Helianthus annuus plant

Family - Asteraceae

Stems - No info. yet.

Helianthus annuus stem

Leaves - No info. yet.

Inflorescence - No info. yet.

Involucre - No info. yet.

Helianthus annuus involucreInvolucre.

Ray flowers - No info. yet.

Helianthus annuus flowers

Disk flowers - No info. yet.

Helianthus annuus diskDisk close-up.

Other info. - This attractive species can be found mainly in the western half of Missouri. The plant is easy to identify becasue of its big flowers and tall stems. For some insight into the origin and cultivation of the common sunflower see Steyermark's Flora of Missouri Volume Two by George Yatskievych, pages 497-500.

Photographs taken off Hwy 13, St. Clair County, MO., 8-15-03.


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