Cherry trees, scientifically known as *Prunus spp.* (sometimes classified under *Cerasus spp.*), are widely recognized by common names such as cherry blossom, wedge, and Jingtao. These trees belong to the genus *Prunus*, which includes a diverse range of species native to the temperate regions of the northern hemisphere. China, particularly its southwest region, is home to the most abundant species, while cultivated varieties have spread across the globe.
Japanese cherry blossoms (*Prunus serrulata*) are among the most famous, prized for their wide adaptability to different climates and soils. They thrive in well-drained conditions, are resistant to cold, drought, and sun exposure, and typically grow as deciduous trees with oval or spherical canopies. Their leaves are alternate, featuring glandular teeth along the edges, and they bloom in clusters—either solitary or in umbel-like inflorescences. Flowers appear before or alongside the leaves, often bell-shaped or tubular, and many cultivars display double petals. The fruits, which mature from May to June, come in red or black hues.
Propagation methods include sowing, grafting, and cuttings. When sowing seeds, it's crucial to keep the embryos moist, often using stratification with wet sand. Common pests and diseases include aphids, moths, scale insects, white rot, and crown gall. Despite these challenges, cherry trees are celebrated for their beauty, creating breathtaking scenes when blooming. A gentle breeze stirs the flowering branches, evoking a sense of wonder and enchantment.
Cherries are not only ornamental but also functional. They are ideal for large-scale planting to create "flower bud" landscapes, can be used in group plantings to enhance greenery, or planted as solitary specimens to highlight their beauty against a sea of green. In Japan and China, cherry blossom hills and scenic spots are iconic attractions. Additionally, they serve as street trees, hedges, or even bonsai.
Some commonly cultivated ornamental species include:
1. *Prunus ferruginea* – A deciduous tree reaching 15–25 meters tall, with dark chestnut-brown bark. Leaves are ovate or ovate-elliptic with awned margins. Flowers are white or pink, 2.5–4 cm in diameter, blooming in April.
2. *Prunus lannesiana* – About 10 meters tall, with pale gray bark. Leaves are obovate with long, awn-like teeth. Flowers are pink or nearly white, fragrant, and bloom in clusters of 2–5 during April.
3. *Prunus subhirtella* – A small tree up to 5 meters high, featuring striped bark on older trunks. Branches are brown, and leaves are obovate to ovate-lanceolate. Flowers are pink, 2–2.5 cm in diameter, appearing in umbels of 2–5 in spring.
4. *Prunus sargentii* – Reaching 12–20 meters, this tree has chestnut-brown, smooth bark. Leaves are elliptic-obovate, and flowers are pink, appearing in clusters of 2–4, measuring 3–5 cm in diameter, from March to April.
5. *Prunus cerasoides* – A 10-meter-tall tree with brown bark and purple-brown branchlets. Leaves are elliptic-ovate or obovate with thick margins. Flowers are pink to dark red, in clusters of 2–5, blooming from February to March.
6. *Prunus majestica* – A towering tree up to 25 meters, with light brown bark and green branchlets. Leaves are long elliptic to lanceolate, and flowers are pink, blooming from November to January.
The cherry blossom is Japan’s national flower, symbolizing beauty, transience, and renewal. Its cultural significance and aesthetic appeal make it one of the most beloved trees worldwide.
Upper Limb External Fixation
The wrist joint external fixation fully considers the physiological characteristics of the wrist joint and the structural stability of the biomechanics, so that the metacarpophalangeal joint can be completely bent freely, and the tendons and ligaments of the fingers and wrists can be relatively relaxed. Moreover, the insertion method, length and stress of the bone traction needle are also considered, and the overall force of the bone traction needle is relatively uniform.
The ulna radius external fixator fractures is relatively simple, generally unilateral fixation, or simple combination fixation, generally should not fix the upper and lower radioulnar joints. Radial external fixation stenting has a good effect on the treatment of fracture. Premature removal after surgery is not appropriate, which is easy to cause dislocation and affect fracture healing. Functional exercise can be carried out gradually after four weeks of plaster external fixation, when the wrist joint function should gradually return to normal.
external fixation device,external fixator arm,Wrist External Fixator,ex fix
Jiangsu Aomed Ortho Medical Technology Co.,Ltd , https://www.aomedortho.com