L'Herbier de France orange leaf has been cultivated in China for at least 4,000 years. The bark, dry green (Qing pi) or ripe (Chen pi), is a famous medicinal plant, which stimulates qi and facilitates digestion. Throughout the centuries, explorers have brought back from their distant travels these flowering trees so delicately scented, with fruit so powerfully scented. The bitter orange, which we now call sour orange, was the first to reach Europe, passing through India; Persia gave it its name (the word "orange" is a deformation of narandj in Persian), the Arabs took it to Sicily and Italy (where it became arancio) then to Provence, in the 11th century, at the time of the Crusades.. In the 16th century the Portuguese brought from Ceylon this time the sweet orange, our orange. Its success was such that we have forgotten about bigarade, the bitter orange, which we now only use to accentuate the flavor of our orange marmalades. It was also in the 16th century when we acquired the habit of using the name of the fruit to designate the color orange. But it is in the sour orange where the leaves and flower buds of our infusions are harvested. Orange herbal tea is the friend of our sleep.