What are the characteristics of ginkgo trees?

Ginkgo trees, also known as ginkgo trees, grow slowly and have an extremely long lifespan. Under natural conditions, it takes more than 20 years from planting to fruiting, and it takes 40 years to bear a large number of fruits. Therefore, the nickname "Gongsun Tree" means "the male species and the grandson gets food." it is the old birthday boy in the tree. Ginkgo tree has appreciation, economic, medicinal value, the whole body is "treasure". Ginkgo trees are the oldest gymnosperms left over from the Quaternary glacier movement, and they are one of the most precious tree species in the world, so they are regarded as "living fossils" in the plant kingdom. The following editor will introduce the characteristics of ginkgo trees.

General characteristics of Ginkgo biloba

1. Leaves: fan-shaped, stipitate, large leaves on long branches are all 2-lobed, leaves on short branches are often wavy notched.

2. Spore leaf bulb: unisexual, dioecious.

3. Microspore leaf globule: catkin, born in the axil of scales at the top of the short branch. The microsporum has a short stalk, and there are often two hanging microsporangia at the end of the stalk.

4. Microspores: oblong, with a sunken distal groove on the longitudinal axis and fine protuberances on the outer wall.

5. Megaspore leaf bulb: simple, usually with a long stalk, with two annular megaspore leaves at the end of the stalk, especially called collar, each bearing an orthophytic ovule.

6. Seed: the seed is nearly spherical, and the seed coat is divided into 3 layers. The embryo has 2 cotyledons, chromosome: Xanth12.

The original characteristics of Ginkgo biloba

Ginkgo biloba has many primitive features. Its leaf vein form is "bifurcated bifurcate vein", which is unique in gymnosperms, but it is very common in ferns. When its male flower pollen germinates, it produces only two swimming sperm with cilia. This feature is found only in cycads in gymnosperms and is also common in ferns. This shows that ginkgo biloba is a more ancient plant than pine, fir, cypress and other trees. Therefore, it is classified as a class, an order, a family, a genus and a species in botany.

Identification characteristics of Ginkgo biloba

Deciduous trees, leaves fan-shaped, scattered on long branches, clustered on short branches. Cones unisexual, dioecious. Seeds drupelike.

Morphological characteristics of Ginkgo biloba

It is a large deciduous tree with a DBH of up to 4 meters. The bark of the young tree is nearly smooth and light gray. The bark of the tree is grayish brown and irregularly longitudinally split, with long branches and slow-growing spur-shaped short branches. Leaves alternate, radially scattered on long branches, 3-or 5-fascicled on short branches, with slender petioles, fan-shaped, light green on both sides, more or less notched or 2-lobed on broad apical margin, 5 × 8 (~ 15) cm wide, with numerous forked and gangrenous veinlets. Dioecious, monoecious, globules solitary in leaf axils of short branches; male flowers in catkin shape, stamens numerous, each with 2 anthers; female flowers with long peduncle, pedicel often bifurcated (sparsely 3-5 forked), forked 1 ovule with discoid receptacle, often 1 ovule developed into a developmental seed.

Seeds drupe, long pedicellate, pendulous, elliptic, oblong-Obovate, ovoid or subglobose, 2.5-3.5 cm long and 1.5-2 cm in diameter; aril fleshy, whitish, yellowish or orange at maturity; seed coat bony, white, often with 2 (sparse 3) longitudinal ribs; endoseed coat membranous

Summary: ginkgo trees are tall and straight, with fan-shaped leaves. The crown is shady and has a cooling effect. The leaf shape is quaint and has a long life. No diseases and insect pests, no environmental pollution, smooth trunk, is a famous pollution-free tree species, conducive to the reproduction of ginkgo and add scenery. Strong adaptability, Ginkgo biloba has broad requirements for climate and soil. Anti-smoke, anti-fire, anti-toxic gas. Ginkgo biloba trees are tall, straight trunks, graceful posture, green in spring and summer, golden in late autumn, it is an ideal tree species for landscaping and street. It can be used as an ideal cultivated tree species for landscaping, roadway, highway, field forest network and windbreak forest belt. It is listed as the four longevity ornamental tree species (pine, cypress, locust, ginkgo) in China.