Here we are with the Christmas flower - the Poinsettia. This one is a rose form. It is petite and delicate. Roses are so beloved that many flower hybridizers try to create 'rose form' flowers. Begonias and Camellias have forms that are especially like roses.
There is a rose (mathematics) entry in Wikipedia. The link is HERE. I expect the picture below is an excellent overview of rose flower petals, although the first few look more like daisies to me than roses. And the references say see also: daisy and shows a picture of "a figure resembling a daisy or sunflower which has circles placed along a spiral.
The definition of rose in mathematics is: A curve which has the shape of a petalled flower. This curve was named rhodonea by the Italian mathematician Guido Grandi between 1723 and 1728 because it resembles a rose (MacTutor Archive).
I encourage you to look at the animated examples of roses created using gears with different ratios.
Today's picture comes from a few years ago, but I can tell you the Poinsettias are blooming at Sunshine Express. I was there a month ago and they had replaced the Chrysanthemums in the greenhouse.
No comments:
Post a Comment