Nuts include almonds, pecans, cashews, walnuts and pistachios.

1. Almonds

Almonds are Prunus armeniaca (Prunus? armeniaca? L.) or the seeds of Prunus armeniaca. Almonds are divided into sweet almonds and bitter almonds, which are mainly distributed in northern China, with Xinjiang, Hebei, Liaoning, Shandong, Shaanxi and other provinces distributing the most.

Bitter almond has a flat heart shape, with a length of 1 ~ 1.9 cm, a width of .8 ~ 1.5 cm and a thickness of .5 ~ .8 cm. The surface is yellowish brown to dark brown, one end is pointed, the other end is blunt and round, thick, and asymmetrical left and right. There is a short-line hilum on one side of the tip, and there are many dark brown veins upward at the junction of the round end. The seed coat is thin, with 2 cotyledons, milky white and rich in oil. Slight breath and bitter taste.

2. pecan

Carya illinoinensis? (Wangenh.) K. Koch), a plant of Juglandaceae. Also known as "pecan with thin shell, pecan with thin skin" and so on. The fruit is oblong or oblong, with a length of 3-5 cm and a diameter of about 2.2 cm. It has 4 longitudinal edges, the exocarp is 4 valves, leathery, the endocarp is smooth, grayish brown, with dark brown spots and black stripes at the top. Incomplete base, 2 cells. It blooms in May and ripens in September-November.

3. Cashews

Cashews, Anacardium occidentalie? Linn is a plant of Dicotyledonous Plants, Sapindaceae, Lacqueraceae and Cashew. Also known as Rushu, Chicken Cashew and Jieshou Fruit. Evergreen tree with erect trunk, up to 1 meters high. Cashew nut is a kidney-shaped nut, belonging to the genus Cashew, Uraceae, Sapindaceae. Native to America.

Cashew nuts are rich in nutritional value, which can be used for cooking and medicine. They are one of the four famous dried fruits in the world.

4. Walnut

Walnut, also known as walnut and peach, is a plant of Juglandaceae. Together with almonds, cashews and hazelnuts, it is called the world-famous "four dried fruits". Walnut kernel is rich in nutrients, containing 15-2g of protein per 1g, more fat and 1g of carbohydrates, and contains various trace elements and minerals such as calcium, phosphorus and iron, as well as various vitamins such as carotene and riboflavin. Good for the human body. It is one of the nut foods deeply loved by ordinary people. Walnut shell is hard and needs to be broken open for eating.

5. Pistachia

Pistachia? vera? L.), also known as Pistacia, is a perennial deciduous fruit tree of Pistacia of Anacardiaceae. Wild species originated in the mountainous areas of Central Asia and West Asia, with the earliest cultivation history of 3,5 years in West Asia, 2, years in Central Asia and 1,5 years in Europe. Pistachio nuts were introduced to California in 1854, and began to be cultivated in large quantities in the United States in 197.