It is the generation of orange flowers. Scientific name tortoiseshell, also known as back to the green orange, Rutaceae, Citrus genus, evergreen shrubs, branches flute, slender, alternate leaves, leathery, oval, spring and summer (4 ~ 5) months of white flowers, strong aroma, the fruit oblate spherical, the winter of the year for the red-orange, and the following summer and become green, it is known as: "back to the green orange," because there are several generations of fruit with the same tree habit, also known as the "granddaughter of the orange". Tortoiseshell is an evergreen shrub, the first year's fruit to stay in the tree over the winter, the next year flowering and new fruit, the color of the skin of the old fruit from yellow back to green, two generations of fruit on the same tree, so called tortoiseshell. Tortoiseshell is slightly bitter, but the aroma is strong, and the smell is forgettable.