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Spirals on the Sunflower

Parastichy, in phyllotaxy, is the (invisible) spiral line of the pattern of the areoles on some plants, such as cacti and pinecones.[1] These spirals involve the insertion of a single primordium.[2]

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  1. ^ Webster's Revised Unabridged Dictionary. C. & G. Merriam Co. 1913.
  2. ^ Weise, Dmitriy (1998-10-29). "Principle of Minimax and Rise Phyllotaxis". Retrieved 2008-12-14.

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