This is a smaller tree than the preceding; the leaves are more elliptical; the flowers are more decidedly white, and yield a stronger perfume; the rind of the fruit is not yellow, but deep orange color, and the pulp is acid and bitter. A good distinctive character is found also in the re markable unevenness of the fruit.

The rind of the fruit, which is bitter, contains a volatile oil, and is employed as a constituent of the compound infusion, the mixture, and the compound tincture of gentian. This and other parts of the plant are used for the same purposes as the sweet orange.

Preparations And Dose. - Aurantii amari cortex; Tinct. Aurantii, 3 i. - ij. (4. - 8.).