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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. These spirals involve the insertion of a single primordium.

See also

• Embryology
• Fibonacci number § Nature
• Gerrit van Iterson
• Golden ratio § Nature
• Phyllotaxis

References

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

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

v t e Patterns in nature
Patterns	Crack Dune Foam Meander Parastichy Phyllotaxis Soap bubble Symmetry in crystals Quasicrystals in flowers in biology Tessellation Vortex street Wave Widmanstätten pattern
Causes	Pattern formation Biology Natural selection Camouflage Mimicry Sexual selection Mathematics Chaos theory Fractal Logarithmic spiral Physics Crystal Fluid dynamics Plateau's laws Self-organization
People	Plato Pythagoras Empedocles Fibonacci Liber Abaci Adolf Zeising Ernst Haeckel Joseph Plateau Wilson Bentley D'Arcy Wentworth Thompson On Growth and Form Alan Turing The Chemical Basis of Morphogenesis Aristid Lindenmayer Benoît Mandelbrot How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension
Related	Pattern recognition Emergence Mathematics and art

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