The first was Carl Correns with his studies about Mirabilis jalapa. It can be found in "Mirabilis jalapa". The "Mirabilis jalapa" flower contains violet, fluorescent betacyanins and yellow, fluorescent betaxanthins. "Mirabilis jalapa" was cultivated by the Aztecs for medicinal and ornamental purposes. The best known species may be "Mirabilis jalapa", the plant most commonly called four o'clock.