Fabaceae

Many plants belong to this big family.

They can be giant trees or small plants. They make special fruit called pods. We often call these pods beans or peas.

These plants help the ground stay healthy. Tiny living things live in their roots. These little helpers take air and turn it into food for the plant.

People have eaten these plants for a very long time. They are a very important food for us.

The Fabaceae family is a huge group of plants.

People often call them legumes. This name comes from the Latin word for bean. This family is the third largest on land. It has nearly 20,000 known species. These plants can be giant trees or small herbs. Some can even be vines that twist around things.

Many legumes are important foods for humans. You might eat peas, beans, or peanuts. Soybeans and chickpeas are also in this family.

Most of these plants have colorful flowers. Insects visit these flowers to help them grow.

These plants have a special way to stay healthy. They work with tiny living things called rhizobia. These helpers live in parts of the roots called nodules. The rhizobia take nitrogen gas from the air. Then, they change it into food for the plant. This set of steps is called nitrogen fixation. It helps the plant grow well in the soil.

The Fabaceae family is a massive group of flowering plants.

You might know them better as legumes, peas, or beans. This family is the third largest on land. It follows only the Orchidaceae and Asteraceae families in size. There are about 765 different genera in this group. Scientists have found nearly 20,000 known species so far. This means they make up about 7% of all flowering plants. They are very common in tropical rainforests and dry forests. These plants can be giant trees or tiny herbs.

Many legumes have a very special way to grow. They work with tiny living things called rhizobia. These helpers live inside small bumps on the roots called nodules. This teamwork is called a symbiotic relationship. The rhizobia take nitrogen gas from the air. Then, they change it into a form the plant can use. This important thing that happens is called nitrogen fixation. It helps the plants get the food they need to grow. Some plants even have leaves that attract ants for protection.

Legumes have very interesting flowers and fruits.

Most flowers are showy to attract insects for pollination. In one group, the flowers have a large petal called a banner. They also have two side petals called wings. The bottom two petals join to make a boat shape called a keel. After the flower is pollinated, it grows into a fruit. This fruit is usually a legume, which is a dry pod. Many pods open along a seam to let the seeds out. Some species have even changed their fruit into berries or nuts.

This plant family has a very long history.

The order Fabales started about 94 to 89 million years ago. These plants began to spread out much later. They grew very fast between 79 and 74 million years ago. We know this because they have a great fossil record. Scientists have found old flowers, leaves, and wood in many places. These fossils help us see how they changed over time. They have been a part of our world for a very long time.

Legumes are very important to people and the planet. Many of them have been staple foods for thousands of years. You likely eat plants like soybeans, peas, or peanuts. Other common foods include chickpeas, broad beans, and even lentils. Some legumes like tamarind and carob are also used by humans. Even things like liquorice come from this large family. Because they help the soil with nitrogen, they are very helpful. They connect the tiny world of bacteria to the big world of food.

The Fabaceae family is a massive group of flowering plants.

You may know them by other names, such as Leguminosae. They are commonly called legumes, peas, or beans. This family is the third-largest group of land plants. It is only smaller than the Orchidaceae and Asteraceae families. There are about 765 different genera in this group. Scientists have identified nearly 20,000 known species. These plants represent about 7% of all flowering plant species. They are very common in tropical rainforests and dry forests across Africa and the Americas.

Legumes show a huge variety in how they grow.

Some are giant trees, like Koompassia excelsa. Others are small annual herbs or woody shrubs. Many are vines, called lianas, that use tendrils to climb. These tendrils can be made from shoots or leaves. Some plants are heliophytes, which love the sun. Others are xerophytes, which are adapted to dry places. Most of these plants have compound leaves. This means one leaf is actually made of many smaller leaflets. They also have stipules, which are small structures at the base of the leaf. These stipules can be leaf-like or even shaped like thorns.

One of the most amazing things about legumes is their chemistry.

Many legumes have a special relationship with bacteria called rhizobia. These bacteria live inside small bumps on the roots called nodules. This is a symbiotic relationship where both sides help each other. The rhizobia take nitrogen gas (N2) from the air. They convert it into a form the plant can use, like nitrate. This process is called nitrogen fixation. This helps the plant grow in many different environments.

Legume flowers are often very colorful to attract insects.

Most are pollinated by insects, a process called entomophily. The flowers are often zygomorphic, meaning they have a specific shape. In the group called Faboideae, the flower has a unique structure. There is a large top petal called the banner or standard. Two side petals are called wings. The two bottom petals are fused into a boat shape called a keel. In another group, the Mimosoideae, the flowers are actinomorphic. This means they are radially symmetrical, like a star. Their showy parts are often long, colored filaments on the stamens.

After fertilization, the flower develops into a fruit. Most legumes produce a simple dry fruit called a legume. This is often called a pod. These pods usually open along a seam, which is called dehiscence. However, some species have evolved different types of fruit. They might produce samarae, berries, or even drupes. This variety allows the family to spread seeds in many ways. The diversity of fruit types is one reason the family is so successful.

Humans have relied on the Fabaceae family for thousands of years.

Many legumes are staple foods that helped human evolution. Common examples include Glycine max (soybean) and Arachis hypogaea (peanut). We also eat Pisum sativum (pea) and Cicer arietinum (chickpeas). Other important members include Medicago sativa (alfalfa) and Vicia faba (broad bean). Some species are even used for things like Glycyrrhiza glabra (liquorice). Not all legumes are helpful to humans, though. Some species, like Pueraria montana (kudzu), act as weedy pests in certain areas.

The history of this family goes back millions of years. The order Fabales likely began 94 to 89 million years ago. The Fabaceae family began to diversify between 79 and 74 million years ago. We know this because the family has a very rich fossil record. Scientists have found fossils of flowers, leaves, and wood from the Tertiary period. These fossils help researchers understand how the plants changed over time. Today, the family remains a vital part of the Earth's biological systems.