Please Help Identify Plant

My father has some volunteer plants in his butterfly garden (mostly zinnias).
We are unsure as to what this is.
http://www.cyberturf.com/wolgamuths/Pictures/DSC00052.jpg
It's the purple spikey flower in the background. Thanks!
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Difficult to say whether it is a Celosia or Amaranthus from the picture but its either one.

zinnias).
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Amaranthus. See: http://www.colostate.edu/Depts/CoopExt/4DMG/Flowers/Annuals/amaranth.htm sed5555
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Wonderful except the plants doesn't match any of the Amaranthus shown in the link.
It could just as easily be a Celosia.
The difference between the two genera is slight and they have been reported to hybridize.
Amaranthus [stigma 2-3, distinct to the base]
Celosia [stigmas united into a style]

zinnias).
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