Camelia sp.

I believe this is a flower and bud from the ericaceous soil loving Camelia or a related genus like Rhododendron or Azalea. This photo was shot at the mediterranean biome of the Eden Project in Cornwall.
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Nikon D7000
105mm, f/2.8 Sigma Macro Lens
1/1000, f/4.5
ISO100

A tulip in detail

Shot at home on a bright red tulip. Converted to black-and-white for clarity. Can you spot a teeny-tiny aphid in the picture? You may wish to see this picture in a larger size on Flickr by clicking on the photo.

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Camera Settings: ISO100, f/10, 1/125
Lens: 105mm f/2.8 Sigma macro lens

Christmas Cactus

This Schlumbergera truncata in my home is still flowering, well into April when I was expecting this to begin to set new branches for the coming year!

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Schlumbergera truncata – See Flickr for more viewing options

Technical details:

f/7.1, 1/30 second, ISO100, 105mm f/2.8 Sigma macro lens, Nikon D7000