macro view of the yellow and blue heart of a sumptuous purple dahlia in autumn, Aberdeenshire, Scotland

            A Potterton garden, Aberdeenshire, Scotland

Dahlia is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico. A member of the Asteraceae (or Compositae), dicotyledonous plants, related species include the sunflower, daisy, chrysanthemum, and zinnia. There are 42 species of dahlia, with hybrids commonly grown as garden plants. Flower forms are variable, with one head per stem; these can be as small as 5 cm (2 in) diameter or up to 30 cm (1 ft) ("dinner plate"). This great variety results from dahlias being octoploids—that is, they have eight sets of homologous chromosomes, whereas most plants have only two. In addition, dahlias also contain many transposons—genetic pieces that move from place to place upon an allele—which contributes to their manifesting such great diversity. The stems are leafy, ranging in height from as low as 30 cm (12 in) to more than 1.8–2.4 m (6–8 ft). The majority of species do not produce scented flowers or cultivars. Like most plants that do not attract pollinating insects through scent, they are brightly colored, displaying most hues, with the exception of blue. Dahlias are perennial plants, with mostly tuberous roots. While some have herbaceous stems, others have stems which lignify in the absence of secondary tissue and resprout following winter dormancy, allowing further seasons of growth. As a member of the Asteraceae the flower head is actually a composite (hence the older name Compositae) with both central disc florets and surrounding ray florets. Each floret is a flower in its own right, but is often incorrectly described as a petal, particularly by horticulturists. The modern name Asteraceae refers to the appearance of a star with surrounding rays.https://en.wikipedia.org/wiki/Dahlia

Taken in: United Kingdom / Scotland / Potterton (show map)

Taken on: October 8, 2016

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Flower

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elegance

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intensity

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“IS USM”

“CANON EF100mm f/2.8L Macro IS USM”

October

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Sets appears in: • Aberdeen & Aberdeenshire, Scotland • Canon, 100 mm f2.8 macro lens more » • Flowers, insects, macro • Natural textures and colours • Scotland « less

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Camera: Canon EOS 7D, f/2.8, 1/60 sec, 100mm, ISO 320 (more info) (hide info)

Camera:	Canon EOS 7D
Lens:	EF100mm f/2.8L Macro IS USM
Aperture:	f/2.8
Exposure Time:	0.017 sec (1/60)
Focal Length:	100mm
ISO:	320
Exposure Bias:	+2/3 EV
Flash:	Off, Did not fire
Exposure Program:	Aperture-priority AE
Exposure Mode:	Auto bracket
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Adobe Photoshop CC 2015.5 (Macintosh)
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