Phyllotaxis

Spirales Alois polyphyllae.

Veronicastro virginico sunt verticilla foliorum a longis internodiis separata.

Species Lithopis incrementum decussatum habet, quo unum foliorum par eodem temporis reponitur, ut solum unum par foliorum actuosorum manet cum vetus par marcet.

Phyllotaxis (Graece φύλλον 'folium' + τάξις 'ordo'), vel phyllotaxia, in botanice est ordo foliorum in caule plantae. Spirales phyllotactici distinctam exemplarium naturalium classem constituunt. Quod vocabulum a Carolo Bonnet excogitatum est ad ordinem foliorum in plantis describendam.

Fundamentales foliorum ordines in caule sunt oppositi et alterni (etiam spirales appellati). Folia etiam in verticillis iacere possunt si nonnulla folia ex idem gradu (ex eodem nodo) eodem tempore in caule exoriuntur, vel exoriri videntur.

In ordine foliorum oppositorum, duo folia ex caule eodem gradu (in eodem nodo) in oppositis caulis lateribus oriuntur; unde par foliorum oppositorum verticillum bifoliatum (duorum foliorum) describi possunt. In exemplari autem alterno (spirale), quodque folium ex unico puncto (nodo) in caule oritur.

Nexus interni

• Decussatio
• Merositas
• Parastichyia

Bibliographia

• Adler, Irving. 2012. Solving the Riddle of Phyllotaxis: Why The Fibonacci Numbers And The Golden Ratio Occur On Plants. World Scientific.
• Douady, S., et Y. Couder. 1996. Phyllotaxis as a Dynamical Self Organizing Process. Journal of Theoretical Biology 178: 255–74.
• Livio, Mario. 2002, 2003. The Golden Ratio: The Story of Phi, the World's Most Astonishing Number. Google Books. Novi Eboraci: Broadway Books. ISBN 978-0-7679-0816-0.
• van der Linden, Frank M. J. Phaselab.
• van der Linden, Frank M. J. 1996. Creating phyllotaxis: The stack-and-drag model. Mathematical Biosciences 133 (1): 21–50. doi:10.1016/0025-5564(95)00077-1. PMID 8868571.
• van der Linden, Frank M. J. 1998. Creating Phyllotaxis from Seed to Flower. In Symmetry in Plants, ed. Denis Barabe et Roger V, Jean. World Scientific Series in Mathematical Biology and Medicine, 4. Singapurae: World Scientific Publishing Company. ISBN 978-981-02-2621-3.

Nexus externi

Vicimedia Communia plura habent quae ad phyllotaxin spectant (phyllotaxis, Phyllotaxis).

• Wolfram, Stephen. Phyllotaxis Spirals et Phyllotaxis Spirals in 3D. The Wolfram Demonstrations Project.
• An interactive L-system using JSXgraph.
• Phyllotaxis: An Interactive Site for the Study of Plant Pattern Formation.
• Interactive Parastichies Explorer. Ad spirales phyllotacticos aedificandos.
• Magnetic Cactus Experimentally Demonstrates Mathematical Plant Patterns.
• Links between Phyllotaxis and the Prime numbers.