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Adansonia digitata

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The African baobab, known scientifically as *Adansonia digitata*, is a massive and highly distinctive tree species.

The baobab, Mahajanga
The baobab, Mahajanga

It is the most widespread member of the *Adansonia* genus. These trees are native to the African continent and the southern Arabian Peninsula, including Yemen and Oman. They are often found in hot, dry savannas and scrublands. In these environments, they dominate the landscape. They are also known by several common names. Some call them the monkey-bread tree because of their edible fruit. Others call them the upside-down tree because their branches look like roots. They are also known as the cream of tartar tree due to the powdery fruit pulp.

One of the most remarkable features of the baobab is its ability to store water.

BaobabTree20230926 100418
BaobabTree20230926 100418

Because they live in areas with long droughts, they must manage water carefully. The trees have U-shaped branches that help rainwater trickle down the trunk. This allows for maximum absorption over a long period. The water moves from the vascular tissue into specialized cells called parenchyma. These parenchyma cells act as long-term storage tanks within the trunk and branches. A single large baobab can store as much as 136,400 liters of water. This storage allows the tree to survive when water is otherwise inaccessible.

To prevent dehydration, the baobab uses a specific survival strategy during the dry season. All baobabs are deciduous, meaning they lose their leaves annually. They remain leafless for about eight months of the year. This process prevents water loss through transpiration. Transpiration is the process where water escapes through tiny holes in the leaves called stomata. If the tree kept its leaves, the water potential in its vascular tissue would drop too low. This would pull water out of the parenchyma cells, causing them to plasmolyse. This cell damage would eventually destroy the tree. During the dry season, the trunk's circumference may shrink by 2 to 3 cm. This reflects a drop in water content of about 10%.

The physical structure of the tree is also unique. The trunk is often very broad, cylindrical, or fluted. It may even have a spreading, buttressed base. Many large trees have a hollow core. This core is often formed by three to eight stems that have fused together as they grew from the roots. The bark is thick, grey, and usually smooth. In mature trees, the bark can be up to 8 cm deep. This thickness is due to the secondary phloem, which makes up 75% of the bark's volume. This thick bark is fibrous and helps the tree heal from severe damage. It also provides structural strength to support the massive weight of the tree.

Baobab flowers are large, white, and hang from long stalks. They are quite showy and often appear in pairs. These flowers have a very short life cycle. They typically open in the late afternoon and remain fertile for only one night. Initially, the fresh flowers have a sweet scent. However, after about 24 hours, they turn brown and emit a carrion smell. The flowers contain a large number of stamens, often between 720 and 1,600 per flower. The seeds are protected by a hard, kidney-shaped coat. These seeds often require fire or passage through an animal's digestive tract to germinate. This helps crack the seed coat so water can penetrate.

Baobab Frucht
Baobab Frucht

The fruit of the *Adansonia digitata* is also highly variable. It can be nearly round or cylindrical, and it features a thick, woody outer shell. Inside, there is a fleshy, light beige pulp. As this pulp dries, it turns into a useful, crumbly powder. These fruits are a key food source for many different animals. The trees are also deeply tied to human history and culture. They have been used for food, water, medicine, and shelter. The earliest written reports of the tree come from the 14th-century travelogue of the Arab traveler Ibn Batuta.

Scientific study of the baobab has a long history. The genus name *Adansonia* honors the French botanist Michel Adanson. He provided the first detailed botanical description of the full tree in 1749. The species name, *digitata*, refers to the leaves. The leaves are palmately compound, meaning they have leaflets that spread out like fingers on a hand. Most mature trees have five to seven leaflets, though some have up to nine. These trees are incredibly long-lived.

Baobabcowherd
Baobabcowherd

Radiocarbon dating has revealed their massive age. The Panke baobab in Zimbabwe was approximately 2,450 years old when it died in 2011. This makes it the oldest documented angiosperm, or flowering plant, in history.

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🖼️ Images & Media (4)
File:Baobabcowherd.jpg
Baobabcowherd.jpg
File:Baobab Frucht.jpg
Baobab Frucht.jpg
File:The baobab, Mahajanga.jpg
The baobab, Mahajanga.jpg
File:BaobabTree20230926 100418.jpg
BaobabTree20230926 100418.jpg
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