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ID
  
 
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True Sunflower
Asteraceae
Helianthus annuus


gardengeek
gardengeek
Flower Petal # 7+
Main Color    
Color 2    
Type Categories Useful Parts

Herb


Asteraceae Family

Helianthus Genus

Location

Found in Utah.




True Sunflower, Helianthus annuus - YouTube.com

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Asteraceae
Asterales
Asterales
Star Order (Daisies)
Euasterids II
Euasterids II
Real Stars Group Two
Asteridae
Asteridae
Class of Stars (Daisies)
Core Eudicots
Core Eudicots
Main, Real, Two First-Leaves (Dicots)
Eudicots
Eudicots
Real, Two First-Leaves (Dicots)
Mesangiospermae
Mesangiospermae
Half Capsule Seed Division
Magnoliophyta
Magnoliophyta
Magnolia Division
Spermatophytes
Spermatophytes
Seed Plants
Euphyllophytina
Real Land Plants
Polysporangiates
Multiple Spore Sub-Kingdom
Stomatophytes
Stomatophytes
Air Pores Sub-Kingdom
Embryophytes
Embryophytes
Multicellular Land Plants
Streptobionta
Streptobionta
Multicellular Plants
Plantae
Plantae
Plants
Eukaryota
Eukaryota
Cells with a Nucleus


General Information

The florets within the sunflower's cluster are arranged in a spiral pattern.

Typically each floret is oriented toward the next by approximately the golden angle, 137.5°, producing a pattern of interconnecting spirals where the number of left spirals and the number of right spirals are successive Fibonacci numbers.

Typically, there are 34 spirals in one direction and 55 in the other; on a very large sunflower there could be 89 in one direction and 144 in the other. This pattern produces the most efficient packing of seeds within the flower head.
Sunflowers in the bud stage exhibit heliotropism. At sunrise, the faces of most sunflowers are turned towards the east. Over the course of the day, they follow the sun from east to west, while at night they return to an eastward orientation. This motion is performed by motor cells in the pulvinus, a flexible segment of the stem just below the bud. As the bud stage ends, the stem stiffens and the blooming stage is reached.
Sunflowers in their blooming stage lose their heliotropic capacity. The stem becomes "frozen", typically in an eastward orientation. The stem and leaves lose their green color.

* The sunflower is the state flower of the US state of Kansas, and one of the city flowers of Kitakyushu, Japan.
* The sunflower is often used as a symbol of green ideology, much as the red rose is a symbol of socialism or social democracy. The sunflower is also the symbol of the Vegan Society.
* Subject of Van Gogh's most famous still life, Sunflowers (series of paintings)





True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



True Sunflower
True Sunflower - August 14, 2009



Sunflower starting to bloom
True Sunflower - August 13, 2009



Close up of the 5 petalled florets
True Sunflower - August 13, 2009



Close up of the blooming florets.
You can see that the younger buds are closer to the center.



In the shade are the male stamen developing.
The cap of the pistil opens up to deploy to stamen. This is because it wants to give the pistil a change to be pollenated by bees.



A close up of most of the sunflower florets.
True Sunflower - August 13, 2009



True Sunflower
True Sunflower - August 13, 2009



True Sunflower
True Sunflower - August 13, 2009



Sunflower head.
Typically, there are 34 spirals in one direction and 55 in the other; on a very large sunflower there could be 89 in one direction and 144 in the other. This pattern produces the most efficient packing of seeds within the flower head.



True Sunflower
True Sunflower - August 13, 2009



Sunflower Fibonacci Spiral
Sunflower Fibonacci Spiral Pattern


Comment: True Sunflower, Helianthus annuus

Page Posts: 2

tobolonoble
tobolonoble
August 14, 2009
Very cool, nice detail - fun to look at these sunflowers close up.
Blossom
Blossom
August 13, 2009
Amazing! Nice work buddy.

Look for True Sunflower on:
Google: True Sunflower Wikipedia: True Sunflower YouTube: True Sunflower
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