Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsFlower Petals Using Parametric Equationshttp://demonstrations.wolfram.com/FlowerPetalsUsingParametricEquations/]]>http://demonstrations.wolfram.com/FlowerPetalsUsingParametricEquations/Phyllotaxis of Plant Shootshttp://demonstrations.wolfram.com/PhyllotaxisOfPlantShoots/]]>http://demonstrations.wolfram.com/PhyllotaxisOfPlantShoots/