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The story of any flower in remote antiquity can sometimes be reconstructed by the obviously primitive bits of magic and myth. That is true as far as Europe is concerned but concerning the Dahlia, it did not originate in Europe. It came from Mexico and was well known by the Aztecs. An Aztec herbal written in Latin just sixty years after the coming of Columbus was brought to light in 1929. An advanced type of culture had existed in Mexico, but its wealth of of written records were destroyed in the interest of bringing Christianity to the heathen. So the discovery of an Aztec Herbal was a piece of incredible luck for the students of the history of Medicine and also for botanists. Out of the remote Mexican we find that the Aztecs used dahlias as a treatment for epilepsy.
The dahlia was late in coming to Europe. By the time it arrived the "curious " men of the sixteenth and seventeenth century were long gone and scientific specialists had taken over. They looked at the dahlia as a possible source of food because a disease in the early 1840`s had destroyed the French potato crop. However after tasting the dahlia they gave up on that idea and decided just to grow it for its beauty.
Modern specialists turned to the dahlia for medical reasons and this time it was not in vain. In the days before insulin was discovered diabetics were often given a substance called Atlantic starch or diabetic sugar made from dahlia tubers. The medicine they yield is no longer fed to diabetics, but it is useful in making clinical tests for the functioning of the liver while inulin, another chemical derived from dahlia tubers, is used in the same way to test the kidneys.