Fagales

Some big trees are in one group. They include oaks and walnuts. They also have birches.

Many of these trees grow tall. They have small flowers.

Wind helps these flowers grow. The wind moves the pollen.

Some of these trees are very old. One old flower was found in amber.

These trees are very special. They make our woods beautiful.

Many famous trees belong to one group called Fagales. This group includes oaks and walnuts. It also has beeches and birches. You might know pecans or chestnuts too. The name Fagales comes from the word Fagus. Fagus is the name for beeches.

Most plants in this group use the wind to grow. This is called wind pollination. They have flowers that are unisexual. This means the flowers have only one sex.

Scientists study how these plants are related. They use a system called molecular phylogenetics. This is a way to study plant family ties using tiny parts of cells. New studies show how the families fit together.

We can also look at very old plants. A fossil flower was found in amber. Amber is hard tree sap that turned into stone. This flower is called Soepadmoa cupulata. It looks like a mix of different plants. Scientists think the first Fagales were like the southern beech.

Many famous trees belong to a group called Fagales. This group includes plants like oaks and walnuts. You might also know chestnuts or pecans. It also contains birches and beeches. The name Fagales comes from the word Fagus. Fagus is the scientific name for beeches. These plants are very important to our world. They make up many of the best-known trees.

Most plants in this group use the wind to grow. This way of working is called wind pollination. They have flowers that are unisexual. This means each flower has only one sex. They are also called monoecious. This describes how they carry their flowers. The wind carries the tiny bits needed for new seeds. This is how they make more trees.

Scientists study how these plants are related. They use a method called molecular phylogenetics. This uses tiny parts of cells to find ties. Older systems like the Cronquist system were different. That system only included four families. One was the birch family, also called Betulaceae. Another was the beech family, or Fagaceae. The others were Ticodendraceae and Corylaceae.

There are seven families in the Fagales group today. The Betulaceae family includes birch and alder. The Casuarinaceae family is the she-oak family. Fagaceae includes the beech and the oak. Juglandaceae is the walnut family. Myricaceae is the bayberry family. Nothofagaceae is the southern beech family. Finally, there is the Ticodendraceae family.

We can learn about the past through fossils. The oldest member is a flower named Soepadmoa cupulata. It was found in New Jersey amber. This amber comes from the Turonian-Coniacian period. The flower looks like a mix of plants. It has traits from Nothofagus and other Fagales. Scientists think the first Fagales were like the southern beech. This helps us see how trees changed over time.

The Fagales are a major order of flowering plants. They belong to the rosid group of dicotyledons. This group includes many of the most famous trees on Earth. You likely know many of them by name. They include oaks, walnuts, and chestnuts. They also include birches, beeches, and pecans. The name Fagales comes from the genus Fagus. Fagus is the scientific name for beeches. These plants are vital parts of many forest ecosystems.

Most plants in this order share specific ways of reproducing. Many Fagales are wind pollinated. This means they rely on the movement of air to move pollen. They are also described as monoecious. This term means they carry unisexual flowers on the same plant. A unisexual flower has only one sex. Instead of one flower having both parts, the plant carries separate flowers for each. The wind carries the pollen from one flower to another. This process allows the trees to create new seeds and continue their life cycles.

Modern scientists divide the Fagales into seven distinct families. The first is Betulaceae, known as the birch family. This includes genera like Alnus and Betula. The second is Casuarinaceae, the she-oak family. The third is Fagaceae, which is the beech family. This family contains important trees like Quercus, which are oaks. The fourth family is Juglandaceae, or the walnut family. It includes trees like Juglans and Carya. The fifth is Myricaceae, known as the bayberry family. The sixth is Nothofagaceae, the southern beech family. Finally, there is the Ticodendraceae family, or the ticodendron family.

Our understanding of these families has changed over time. Scientists use a system called the APG III system to classify them today. This system uses modern molecular phylogenetics. This is the study of the relationships between organisms using their molecules. In the past, scientists used the older Cronquist system. That system only recognized four families within the order. These were Betulaceae, Fagaceae, Ticodendraceae, and Corylaceae. Today, Corylaceae is included within the Betulaceae family.

Earlier classification methods placed many of these plants in different groups. The Casuarinales were once seen as a single family called Casuarinaceae. The Juglandales included both Juglandaceae and Rhoipteleaceae. The Myricales included the Myricaceae family and others. Scientists changed these groupings because of new studies. These studies suggested that the Myricales group was paraphyletic. This means the group did not include all the descendants of its common ancestor. Molecular studies helped create a more accurate map of how these plants are related.

We can learn about the history of these plants through fossils. The oldest known member of the order is a flower called Soepadmoa cupulata. This fossil was found preserved in amber. Amber is fossilized tree resin. This specific amber comes from the late Turonian-Coniacian period in New Jersey. The flower is described as a mosaic. This means it shows a mix of different physical traits. It has characteristics of Nothofagus and other members of the Fagales.

This fossil provides a clue about the ancestors of all Fagales. Because Soepadmoa cupulata shares traits with Nothofagus, scientists have a theory. They suggest that the original ancestor of all Fagales was Nothofagus-like. This means the southern beech group might represent the ancient form of this entire order. By studying these tiny fossilized flowers, we can trace the long history of the world's most famous trees.