What kind of plant is yew

Metasequoia is gymnosperms.

Metasequoia metasequoia is the only deciduous tree of the genus Metasequoia in the family Fir family, the plant is tall, the height of the tree can reach 35 meters, the base of the trunk is often expanded, the bark is gray, and often falls off; The twigs are opposite, hanging downward.

Metasequoia introduced

Metasequoia is a gymnosperm in the cypress family. Deciduous tree, twigs opposite, drooping. The leaves are linear, alternately opposite, pseudo-two rows into pinnate compound leaves, cm long, with 4-8 stomatal lines on both sides below.

Monoecious. cones drooping, nearly spherical, slightly 4-edged, centimeter long, with long stalks; Seed scales woody, shield-shaped, each scale with 5 9 seeds, seeds flattened, with narrow wings around it.

It likes warm and humid climate, cool summer, snow but not severe cold in winter, and the average annual temperature of the production area is 13, the extreme minimum temperature is -8, the extreme maximum temperature is about 24, and the frost-free period is 230 days; The annual precipitation is 1500 mm, and the average annual relative humidity is 82%. The soil is acidic mountain yellow soil, purple soil or alluvial soil, pH value.

It is mostly born in the valley or near the foothills of the valley, the soil layer is deep, moist or slightly waterlogged, the cold tolerance is strong, the ability to withstand water and humidity is strong, it can grow as a light-loving tree species in light saline-alkali land, the root system is developed, the speed of growth is often governed by soil moisture, and it grows slowly in the place where the water is not well drained for a long time, and the base of the trunk is usually enlarged and has longitudinal ridges.

Light-loving, intolerant to barrenness and drought, purifies the air, grows slowly, and transplants are easy to survive. The acclimatization temperature is minus 8 degrees Celsius to 24 degrees Celsius.

Yew is a shallow-rooted plant.

Yew evergreen tree with a height of 30 m and a dry diameter of up to 1 m. The leaves are spiral-shaped, twisted into two rows at the base, strip-shaped. Slightly curved, 1 long, 2 wide, the leaf margin is slightly recurved, the leaf end is acute, there are 2 broad yellow-green or gray-green stomatal bands on the leaf back, there are fine convex spots dense on the midrib, and the leaf margin is green with pole kiln.

dioecious, male cones solitary in leaf axils; The ovules of the female cones are solitary at the tip of the lateral short axis of the upper flower axis, with a disc-shaped aril at the base. The seeds are oblate-oval, with 2 ribs, the seed umbilicus is oval, with a red cup-shaped aril, and the maturity period is in September to November.

Yew type.

Yew is an endemic tree species in China, which is distributed in southern Gansu, southern Shaanxi, Sichuan, northeast and southeast Yunnan, western and southeastern Guizhou, northern Guangxi, northeast Hunan, western Hubei and southern Anhui Huangshan, and often grows in the upper part of the mountain.

Yew properties.

Yew is a plant of the genus Taxus in the family Taxaceae. It is highly adaptable and can be planted in both the north and the south. It is cold and shade-tolerant, and likes humid and cool climates. It grows well in well-drained, loose, fertile sandy soils.

Appearance. Yew trees are 30 meters high. It has a DBH of 60-100 cm and the bark falls off in strips. The shoots are green when young, and the reddish-brown or gray-brown branches are two- and three-year-old.

Leaf. The leaves of yew land are prepared in two rows, strip-shaped, slightly curved or straight. The upper part is dark green, and the lower part is yellow-green. There are also two stomatal bands. The midrib has a rounded keratinous papillae, often of the same color as the stomatal band.

Color. The bark of yew trees is grayish-brown, reddish-brown or dark brown, and the winter buds are yellowish-brown, light-brown or reddish-brown.

Taxus role and value.

Yew is a recognized anti-cancer plant. The paclitaxel contained in yew has a unique resistance mechanism to tumors, and has significant effects on dysmenorrhea, hyperglycemia, hypertension, tumors, leukemia, diabetes, cardiovascular and cerebrovascular diseases, etc.

A precious plant that is on the verge of disappearing.