Plant name: Metasequoia glyptostroboides
Family and genus: Metasequoia glyptostroboides.
Morphological characteristics: deciduous trees, up to 35 meters, DBH 2.5 meters; The base of the trunk often swells; Bark is gray, taupe or dark gray, young trees are split into thin slices, and big trees are split into strips; The big branches spread obliquely, the branchlets droop, the young tree crown is in the shape of a steeple, the old tree crown is wide and round, and the branches and leaves are sparse; The annual branches are smooth and hairless, green when they are young, and then gradually turn light brown, and the second and third-year branches are light brown gray or brown gray; The lateral branches are pinnate, 4- 15 cm long and deciduous in winter; The leaves are strip-shaped with a length of 0.8-3.5cm (often 1.3-2) and a width of1-2.5mm (often 1.5-2). The upper part is light green, and the lower part is lighter. There are two yellowish stomatal zones along the midvein, each with 4-8 stomatal lines. The cone is pendulous, nearly quadrangular or rectangular, green before maturity, dark brown when mature, with a length of1.8-2.5cm, a diameter of1.6-2.5cm, a stalk of 2-4cm, and staggered strip leaves on it. The seed scales are woody, shield-shaped, usually112 pairs, crossed and opposite, with a flat diamond top, a transverse groove in the center, a wedge-shaped base and a height of 7-9 mm. The seed scales have 5-9 seeds. Seeds flat, obovate, sometimes round or oblong, surrounded by wings, with a notch at the top, about 5 mm long and 4 mm in diameter; 2 cotyledons, strip-shaped, long1.1.3 cm, wide 1.5-2 mm, slightly raised on both sides of midvein, with stomatal lines above and no stomatal lines below; The primary leaves are long, opposite, 1- 1.8 cm long, with stomatal lines below. Flowering in late February, cones 1 1 mature.