Citrus reticulata Blanco, also known as kumquat, tangerine, orange, etc., is a small tree in the Rutaceae family of the Citrus genus. Citrus has more branches and fewer thorns. Single compound leaves, leaf blades lanceolate, elliptical or broadly ovate. Flowers are solitary or clustered with 2-3 flowers. The fruit has various shapes, usually flattened to nearly spherical, with light yellow, vermilion or deep red color. The flesh is sour, sweet, bitter, or has a unique odor. Seeds may be abundant or few, sparse and seedless, usually oval in shape. The flowering period is from April to May, and the fruiting period is from October to December.

Kumquat, also known as kumquat, is an evergreen shrub of the genus Kumquat in the family Rutaceae. Trees within 3 meters in height, with thick leaves, ovate lanceolate or oblong in shape, slightly pointed or blunt at the top, and wide wedge-shaped or nearly round at the base; The petiole is 1.2 centimeters long, and the wing leaves are very narrow. Single flower or 2-3 flower clusters; The flower stem is 3-5 millimeters long; The ovary is elliptical, the style is slender, usually 1.5 times the length of the ovary, and the stigma is slightly enlarged. Oval or oval shaped fruit, ranging from orange yellow to orange red in color, with a sweet taste on the skin; The seed is oval in shape, with green cotyledons and embryos, and a single embryo or occasional multiple embryos. The flowering period is from March to May, and the fruiting period is from October to December.

Sweet orange is a citrus tree in the Rutaceae family, with few or no thorns on its branches; The flowers are white, with fewer flowers having a light purple red color on the back; The fruit is round, flattened, or elliptical in shape, ranging from orange yellow to orange red; The leaves are oval or ovoid in shape; The skin is generally difficult to peel off, and the flesh is light yellow, orange red, or purple red, with a sweet or slightly sour taste; The flowering period is from March to May; The fruiting period is from October to December, and the fruiting period of late maturing varieties is from February to April of the following year. In "Pulse of Macau", it is mentioned that the origin of the name "Sweet Orange" comes from the abbreviation of "Old Tree Sweet Orange", which evolved into "Sweet Orange" after being passed down orally.

Unknown about fire, this is a mixed citrus variety under the citrus genus of the Rutaceae family. I don't know if the fire tree has moderate or weak vigor, but is relatively upright; The branches are hard, dense, thin and short, with small thorns; Almost all of them are single flowers with low pollen content, and most of them are malformed flowers. The rate of no drupe is high, and the fruit is pear shaped or high flattened round. The fruit is large and often has a short neck at the stem; The fruit surface is orange yellow or orange, and the skin is rough, moderately thick, and easy to peel off; The flesh is crispy, tender, and juicy, with thin and crispy walls and high sugar and acid content. Mature from February to March of the following year.