Information on plant extinction, what are the extinct plants

The extinct plants include Chinese pigeon tree, Bennei, cycad, naked fern, reed, seal wood, scale wood, and Lenny fern.

Among them, the Chinese pigeon tree, also known as the dove tree, also known as the pear and pigeon tree, is a deciduous tree. It is a relict plant left over from the Tertiary period of the Cenozoic Era 10 million years ago, and during the Quaternary glacial period, most of the dove trees in most areas were extinct one after another. Because of the high mountains and rivers in our country, it has become a natural refuge for various animals and plants, and it is one of the ancient plants that survived in the remote mountainous areas of the central and western parts of our country, and botanists call it the pearl in the forest sea, the living fossil of plants and the green panda.

The reed tree is a deciduous tree, and the bark falls off in irregular flakes. Leaves solithin, alternate, clustered on short branches, leaves papery, broadly ovate or nearly heart-shaped, apex acute, base heart-shaped, margins coarsely serrate, petioles 4.5 cm long, flowers heterogeneous, apical inflorescence composed of many male flowers and one bisexual flower.

Causes of the extinction of plants and animals

1. Asteroid impact.

This is the first thing most people associate with the word "extinction", and it is not for nothing that some experts believe that 65 million years ago, a meteor hit the Yucatán Peninsula in Mexico, causing the extinction of the dinosaurs.

2. Climate change.

Even without a major impact from an asteroid or comet, climate change, which could lower global temperatures by 20 or 30 degrees Fahrenheit, poses a constant danger to terrestrial animals. You only have to look at the last ice age, about 11,000 years ago, when various large animal mammals were unable to adapt to rapidly warming temperatures, and they also succumbed to a lack of food and predation by early humans.

3. Disease. While it is unusual to eradicate a particular species with disease alone, the foundation must first be laid through starvation, habitat loss, or lack of genetic diversity, and the introduction of a particularly deadly virus or bacterium at the wrong time can wreak havoc.

Sheep's horn garlic: Because of its similar appearance to sheep's ears, it is also known as sheep's ear garlic. Ming Codonopsis:

It is a valuable medicinal herb, in which the wild species has become extinct. Star Tree: It is a primitive lycopodium.

Reed: Lived from the Early Carboniferous to the Late Permian. Marsh Orchid:

The flowers are only purple and white.

1. Horn garlic

Sheep's ear garlic is a sheep's ear garlic orchid plant, because its appearance is similar to the ear, also known as sheep's ear garlic, like to grow in the understory, shrubs or grassland shelters, but due to the indiscriminate deforestation, the sheep's ear garlic is now extinct.

2. Ming Codonopsis

Codonopsis is a kind of precious medicinal material, which mainly grows in the southern region of our country, but due to a large number of people's mining, the wild Codonopsis has become extinct, in addition, Codonopsis Ming likes a warm and humid environment, has strong cold resistance, but is not resistant to waterlogging.

3. Star wood

It may be a primitive lycopodium with a height of about 50 centimeters, and the pseudorhizome is partially drawn downwards with false roots, and upwards are developed into aerial stems, noting that bifid bifurcated lateral branches grow around the aerial stems.

4. Reedwood

Alobe is an ancient plant of the class Equisetum class, its leaves are born in rotation on the stem nodes, the shape is linear or lanceolate, and there is a large pith in the middle of the stem, according to the records of its existence from the Early Carboniferous to the Late Permian.

5. Marsh orchid

The swamp orchid is a plant that grows in northern Europe, and its flowers are relatively simple, only purple and white, but due to the over-opening of wetland resources, the swamp orchid has been identified as an extinct species.

The plant names are as follows:

1. Baishanzu fir.

It is a tree species of the genus Fir in the family Pinaceae, with a height of about 11 meters and a DBH of 40 cm; The bark is grayish-white, irregularly cracked, and the lobes are more longitudinal than horizontal; The large branches are flat, and the bark of the branches is irregularly and shallowly lobed. Baishanzu fir is a first-class key protected wild plant of the National Administration, and was listed as one of the 12 most endangered plant species in the world in 1987.

2. Alder. Also known as snake wood, it is a fern of the family Alder and Alder genus, and is praised as the "king of ferns". Alder is a fern that can grow into a large tree, and it is also called "tree fern" when it touches the sail.

The stem of alder is erect, hollow, like a pen holder, and the leaves are arranged in a spiral shape at the tip of the stem. It is the only woody fern that has been discovered, and it is extremely valuable and can be called a national treasure.

1. Ancient Chinese fruit The "world's earliest flower" that bloomed in western Liaoning region of China 100 million years ago has recently been confirmed to belong to the Li group, the oldest new group of angiosperms so far.

2. Seed fern: extinct gymnosperms. It may have originated from the pregymnosperm recluse, which appeared in the Late Devonian, was extremely prosperous in the Carboniferous Permian, gradually declined in the Mesozoic, and became extinct in the Cretaceous.

3. Bennecycad: ancient plant, an eye of cycads. Directly derived from the myelin seed fern. Some stems are thick and short, covered by the remaining leaf base of the petiole; Some are thin and branched, with a smooth surface, and live from the Triassic to the Oligocene.

4. Reedwood: Reed is an ancient plant, belonging to the class of Equisetum officinalis, with linear or lanceolate leaves, with a single vein, and the rears are born on the node. There is a large pith in the middle of the stem. Lived from the Early Carboniferous to the Late Permian.

5. Star wood: Star tree may be the most primitive lycopodium plant. About meters high.

The rhizome part and its pseudoroots or roots that protrude downwards are bifid branches, and the upward growth develops into dedicated aerial stems, and the bifurcated lateral branches grow around the stems.