well I never knew that - a photo on Flickriver

seriously - best viewed large.

they're not actually a flower but a cluster of flowers in a "head"

'well I never knew that' - even more colourful on black :-)

The sunflower (Helianthus annuus) is an annual plant native to the Americas in the family Asteraceae, with a large flowering head (inflorescence). The stem of the flower can grow up to 3 metres tall, with the flower head reaching up to 30 cm in diameter with the "large" seeds. The term "sunflower" is also used to refer to all plants of the genus Helianthus, many of which are perennial plants.

What is usually called the flower is actually a head (formally composite flower) of numerous flowers (florets) crowded together. The outer flowers are the ray florets and can be yellow, maroon, orange, or other colors, and are sterile. The florets inside the circular head are called disc florets. The disc florets mature into what are traditionally called "sunflower seeds", but are actually the fruit (an achene) of the plant. The true seeds are encased in an inedible husk.

The florets within this cluster are arranged spirally. Typically each floret is oriented toward the next by approximately the golden angle, 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 1 direction and 55 in the other; on a very large sunflower you may see 89 in one direction and 144 in the other.

from the wikipedia :-)

Taken on: August 17, 2006

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not actually a flower but a head with a cluster of flowers

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Sets appears in: • Interestingness • Nature at its most beautiful more » • Flowers « less

Groups appears in: • Flower Macros ~ONE photo per day~GROUP CLOSED • flowerhearts - 3 pics a day! more » • Flower Close-Ups • Natures Art (Post 2 + Comment 1 & Fav 1) • Flower Center Macro ... Up Close and Personal • Flower macroism/Please comment on • Blue and Yellow. Yes, it's that simple! • A+++ Photo (Post 1, Give 3 awards ONLY) Not commenting = Ban • Fl♥ckr Hearts -- Post 1 & Give 3 Hearts - CLOSED • Natures Finest (Invited Images Only) • Super Shots - Post 1 - Award 2 « less

Camera: Fujifilm FinePix6900ZOOM, f/8.0, 18.2mm, ISO 100 (more info) (hide info)

Camera:	Fujifilm FinePix6900ZOOM
Aperture:	f/8.0
Focal Length:	18.2mm
ISO:	100
Exposure Bias:	0 EV
Flash:	Fired
Exposure Program:	Program AE
Metering Mode:	Multi-segment
Color Space:	sRGB
Software:	Adobe Photoshop CS Windows
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