Parastichy
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)
References
- Webster's Revised Unabridged Dictionary. C. & G. Merriam Co. 1913.
- Weise, Dmitriy (1998-10-29). "Principle of Minimax and Rise Phyllotaxis". Retrieved 2008-12-14.
External links
- Smith College, Spiral Lattices & Parastichy
- Interactive Parastichies Explorer
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