Adansonia

The baobab is a very big tree.

It has a very fat trunk. The trunk holds water inside. This helps it live in dry lands.

Some people call it the upside down tree. This is because of how it looks. The trees have large flowers. These flowers open at dusk. They even move fast enough to see!

The fruit is large and round. It has seeds inside a soft pulp. These trees can live for a very long time.

Baobabs are large trees known as Adansonia.

They grow in Africa, Australia, and Madagascar. Many people call them "upside down trees." This is because of how they look.

These trees have very wide trunks. The trunks store water to help them live in dry places. This water helps them survive when it does not rain. Baobabs are also very old. One tree in Zimbabwe lived for 2,450 years!

Baobabs have large, colorful flowers. These flowers open at dusk. They move so fast that you can see them open with your eyes.

Most baobabs use bats to help them make seeds. This is called pollination.

The fruit is large and shaped like a berry. It has a hard shell. Inside, there are kidney-shaped seeds in a soft pulp.

In southern Africa, some old baobabs have begun to die. This might be because they are too thirsty from heat and drought.

Baobab trees are amazing living things known as Adansonia.

These trees are famous for their huge, wide trunks. Many people call them "upside down trees" because of how they look. They can grow in very dry places. Most species are found in Madagascar, Africa, and Australia.

Some baobabs were even moved to places like Barbados and Asia. They are some of the longest-living plants on our planet.

These trees have a special way of surviving dry weather. They use their massive trunks to store water.

When it rains, the trunk diameter can even change. The wood inside is made of many fibrous rings. These rings help hold the water for a long time. This stored water helps the tree stay alive during droughts. This is how they manage to live in harsh lands.

Humans have studied these trees for a very long time. An Arab traveler named Ibn Battuta wrote about them in the 14th century. Later, a man named Prospero Alpini saw the fruit in Egypt in 1592. He called them "Bahobab," which might mean "many-seeded fruit."

Later, a French explorer named Michel Adanson described the whole tree in 1749. He saw a tree on the island of Sor in Senegal. Scientists named the genus Adansonia to honor his work.

There are eight different species of baobab trees.

One species, Adansonia digitata, can have trunks that are very wide. The smallest species is Adansonia gregorii from Australia. Most of the other species live only in Madagascar.

These trees have large flowers that open at dusk. The flowers move so fast you can see them open! They stay open for a maximum of 15 hours. Most of these flowers rely on bats to help them make seeds.

Baobabs are part of the natural world we see every day. Their fruits are like large berries with hard shells.

Inside the shell, you will find kidney-shaped seeds in a dry pulp. Many animals use these trees for homes. For example, birds like the mottled spinetail build nests in them.

Sadly, some old trees in southern Africa are dying recently. Scientists think they might be dying from extreme thirst due to heat.

The genus *Adansonia* contains several species of medium-to-large deciduous trees known as baobabs.

These trees are famous for their massive, often bottle-shaped trunks and compact crowns. Because of their unique appearance, they are frequently called "upside down trees." Baobabs are among the longest-lived vascular plants on Earth. They play vital roles in the ecosystems of Africa, Australia, and Madagascar.

While they are native to these specific areas, they have been introduced to other regions like Asia and Barbados.

To survive in seasonally arid environments, baobabs have developed a remarkable water-storage mechanism. The massive trunks are composed of fibrous wood arranged in concentric rings. Unlike many trees, these rings do not always form annually. This makes it difficult to determine a tree's age just by counting them. The diameter of the trunk actually fluctuates based on rainfall. This suggests the trunk acts like a reservoir to store water during droughts.

This ability to hold water allows them to endure long periods without rain.

The reproductive process of the baobab is both rapid and visually striking. Most species produce large, showy, and strongly scented flowers that open near dusk. The movement of the flower parts during opening is so fast it can be seen by the naked eye.

However, the reproductive phase is very short. Pollen is shed during the first night, and the stigmas are often shriveled by the following morning. This means the flowers are only reproductive for a maximum of 15 hours. Most *Adansonia* species rely on bats for pollination during these brief windows of activity.

Baobab flowers have a complex structure involving a calyx and a staminal tube. The outer calyx consists of five lobes that are often green or reddish. As the flower opens, these lobes split and become reflexed, or bent back, at the base. Inside, there is a central staminal tube made of fused filaments. A long style, which is tipped with a stigma, emerges from these filaments. The fruit follows the flowering stage and is typically large, oval, or round. Most species produce a berry-like fruit with a hard, indehiscent shell.

Inside this shell, kidney-shaped seeds are found within a dry, pulpy matrix.

Scientists classify the genus *Adansonia* into three distinct sections based on their characteristics. Section *Adansonia* contains only one species, *Adansonia digitata*, which is the type species for the genus. This species is unique because it is tetraploid, meaning it has four sets of chromosomes, while all other species are diploid.

Section *Brevitubae* includes *A. grandidieri* and *A. suarexensis*, which have flower buds about twice as long as they are wide. The remaining species belong to Section *Longitubae*. These species have flower buds that are five or more times as long as they are wide.

There are eight accepted species in total, with six being endemic to Madagascar.

The history of baobab study spans several centuries of botanical exploration. The earliest written reports appear in a 14th-century travelogue by the Arab traveler Ibn Battuta. In 1592, Prospero Alpini provided the first botanical description of the fruit in Egypt. He referred to them as "Bahobab," which likely means "many-seeded fruit."

In 1749, the French naturalist Michel Adanson provided the first detailed description of the full tree. The genus was later named *Adansonia* by Linnaeus to honor Adanson's work. This taxonomic history helps scientists understand how these trees were first recognized by the wider world.

Baobabs are significant both ecologically and historically. In Africa, the *A. digitata* species is considered an icon of the bushland. Local populations often use the fruit for food and medicine. They also use the trunks as reservoirs to store water. Many animals depend on them, such as the mottled spinetail and various weaver birds that use them for nesting. However, the genus faces modern challenges. In the early 21st century, many large baobabs in southern Africa began to die rapidly. Scientists believe this may be caused by mass dehydration due to rising temperatures and drought.