The fruit is oblong or rectangular, 3-5 cm long and 2.2 cm in diameter. It has four longitudinal edges, the exocarp is 4 petals, leathery, the endocarp is smooth and grayish brown, with dark brown spots and black stripes at the top. Incomplete base, 2 cells. It blooms in May and matures in September-165438+1October.
It originated in the United States and northern Mexico, and now it is centered on the United States and distributed in more than 20 countries and regions on five continents, such as the United States, Canada, Mexico, Brazil, Argentina, Peru, Italy, France, Australia, Egypt, South Africa, Israel, Japan and China. Carya cathayensis is a world-famous dried fruit tree species.
Extended data
The frost-free period in the natural distribution area of Carya cathayensis is 140-280d, and the frost-free period in the main producing area is more than 220d, with an annual accumulated temperature of ≥ 10℃ of 3300-5400℃, and the required cold degree is ≤7.2℃ and the low temperature is 500h h. ..
The northern varieties of Carya cathayensis can tolerate the low temperature of -29℃, while the southern varieties can only tolerate the low temperature of-18℃. In the distribution area of Carya cathayensis in the United States, the annual precipitation in the southeast is generally10130-1600, and it is 500-800mm in the arid areas in the west and north. The growth and development of Carya illinoensis need sufficient water and certain air relative humidity.
Excellent urban street trees and greening trees. Carya illinoensis has fast growth speed, straight trunk end, nearly wide oval crown, water resistance and moisture resistance, and can be planted singly or in clusters, so it is a good urban street tree and greening tree species.
Fast-growing tree species with excellent wood. Carya illinoensis wood is fine in structure, high in physical strength, strong and tough, beautiful in color, dense in texture, elastic and not easy to crack, and has been used as high-grade wood. According to relevant data, the DBH of 20-year-old Carya cathayensis is 30 cm, the volume reaches 0.4 cubic meters, and the volume per hectare reaches 75 cubic meters.