GeoChemBio.com/biology/organisms/Helianthus annuus (common sunflower)

 

Sunflower flower
Sunflower ripening

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Helianthus annuus, common sunflower

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Taxonomic lineage

cellular organisms - Eukaryota - Viridiplantae - Streptophyta - Streptophytina - Embryophyta - Tracheophyta - Euphyllophyta - Spermatophyta - Magnoliophyta - eudicotyledons - core eudicotyledons - asterids - campanulids - Asterales - Asteraceae - Asteroideae - Heliantheae - Helianthus - Helianthus annuus

Brief facts

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Developmental stages (life cycle)

Life Cycle Stages

The total time required for development of a sunflower plant and the time between the various stages of development depends on the genetic background of the plant and growing season environment. In the case of branched sunflower, determinations are usually made by using only the main branch or head.

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Emergence: seedling that has no true leaves yet, just a pair of cotyledons

Sunflower seedlings

Vegetative V4

Sunflower V4 stage

End of vegetative stages

Sunflower's last vegetative stages

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Bud stage

Sunflower, Bud stage

Beginning of anthesis

Sunflower, beginning of anthesis

Full bloom

Sunflower flowering

Ripening

Sunflower ripening

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Westward orientation of sunflower buds at sunset

Sunflower heliotropism

Eastward orientation of opened flowers at sunset

Sunflower heliotropism

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Two-faced sunflower

Cultivar "Red Sun" ("Sol Rojo")
Two-faced sunflower with two back-to-back flowers, 14/8/2010 Two-faced sunflower with moth, 14/8/2010
Two-faced sunflower attended by two bumblebees, 8/23/2010 Two-faced sunflower from the back: joining, 8/23/2010

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References

Websites

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