Ginkgo biloba (scientific name: Ginkgo biloba) is a deciduous tree, which blooms in April and matures in June at 5438+ 10, with orange-yellow drupe-like seeds. Ginkgo biloba is the oldest seed plant in relict plant. All other plants in this category have become extinct. It is called a living fossil and was born hundreds of millions of years ago. Ginkgo biloba is sparse, and a century-old tree is rare. There are 26 varieties and varieties: ginkgo, ginkgo, ginkgo, ginkgo. Ginkgo tree, also known as ginkgo tree, grows slowly and has a very long life. Under natural conditions, it takes more than 20 years from planting to fruiting, and it takes 40 years to produce a large number of fruits. Therefore, it is nicknamed "Gongsun Tree", which means "edible for the masses". It is the birthday star on the tree and was called "Ginkgo biloba" in ancient times.

Leaves: fan-shaped, stalked, the leaves on long branches are mostly dichotomous, and the leaves on short branches are often wavy.

Spore cotyledons: unisexual, heterotrophic.

Cotyledon of microspore: a catkin, born in the axils of the scales at the top of short branches. Microspore petiole is short, and there are often two suspended microspores at the stalk end.

Microspore: oblong, with a concave groove on the longitudinal axis and tiny protrusions on the outer wall.

Megaspore bulb: solitary, usually with a long stem, with two annular megaspore leaves at the end of the stem, especially the collar, on which 1 upright ovule is born.

Seed: The seed is nearly spherical, the seed coat is divided into three layers, and the embryo has two leaflets.