Genetic mutant sunflower.the gene responsible for the ââ¬Ëdouble-flowerââ¬â¢ mutation immortalized by Vincent van Gogh in his iconic Sunflowers series.Van Goghââ¬â¢s 1888 series includes one painting, now at the National Gallery in London, in which many of the flowers depicted lack the broad dark centre characteristic of sunflowers and instead comprise mainly golden petals. This was not simply artistic licence on van Goghââ¬â¢s part but a faithful reproduction of a mutant variety of sunflower.