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]
![](../I/Pflanze-Sonnenblume1-Asio.JPG.webp)
Spirals on a sunflower
![](../I/Aeonium_tabuliforme.jpg.webp)
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.
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