Spirals on a sunflowerDetail of Aeonium tabuliforme showing the multiple spiral arrangement (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]
^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.
Parastichy, in phyllotaxy, is the spiral pattern of particular plant organs on some plants, such as areoles on cacti stems, florets in sunflower heads...
1830, Karl Friedrich Schimper and Alexander Braun discovered that the parastichies (spiral phyllotaxis) of plants were frequently expressed as fractions...
separating the individual primordia, with the Fibonacci angle giving the parastichy with optimal packing density. Mathematical modelling of a plausible physical...
symbolism, they are closely related to the tree of life. Conifer nuts Parastichy Strobilus A pine cone covered in ice after an ice storm. Male cones of...
phyllotaxis, the arrangement of leaves on a stem, and in the arrangement (parastichy) of other parts as in composite flower heads and seed heads like the sunflower...
Richards, Philos. Trans. R. Soc. London, Ser. B 235, 509 (1951). Orthostichy, Parastichy and Plastochrone Ratio in a Central Theory of Phyllotaxis v t e...
Doyle spiral is called a parastichy and the arm counts of the Doyle spiral are called parastichy numbers. When the two parastichy numbers p {\displaystyle...
Netherlands Academy of Arts and Sciences. He retired in 1948. Tessellation Parastichy A.D.J. Meeuse, Life Message G. of Iterson 1972, Amsterdam, pp . 122-126...
florets forming an elaborate crisscrossing pattern of different spirals (parastichies). He recognises their beauty but dismisses any mystical notions; instead...
Chris Brown. In the later shows "Positional Vertigo," "Phyllotaxis and Parastichy in a Time of Love and War," and "Impossible Matter" (Mercury 20 Gallery...
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