Parastichy

Summary

Parastichy, in phyllotaxy, is the spiral pattern of particular plant organs on some plants, such as areoles on cacti stems, florets in sunflower heads and scales in pine cones.[1] These spirals involve the insertion of a single primordium.[2]

Spirals on a sunflower
Detail of Aeonium tabuliforme showing the multiple spiral arrangement (parastichy)

See also edit

References edit

  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.

External links edit

  • Smith College, Spiral Lattices & Parastichy
  • Interactive Parastichies Explorer