Nepedia
Back to Discover
Advanced Reader
🧬

Maclura pomifera

life science Maturity 5-7 Next article →

The Osage orange, known scientifically as Maclura pomifera, is a hardy deciduous tree or large shrub. It belongs to the Moraceae family, which is the mulberry family. This tree is native to the south-central United States. It is known for its unique fruit and incredibly strong wood. While it looks like a citrus fruit, it is not actually related to oranges.

Maclura pomifera range map
Maclura pomifera range map

The tree has several distinct physical features. Mature trees often have short trunks and round-topped canopies. Their roots are thick and fleshy, covered in bright orange bark. The mature bark of the tree is dark, scaly, and deeply furrowed. The leaves are long and oval with a slender point. They are thick and dark green on top, but paler on the bottom. In the autumn, these leaves turn a bright yellow.

Osage orange Maclura pomifera Top
Osage orange Maclura pomifera Top

One of the most interesting parts of the tree is its fruit. The fruit is a multiple-accessory fruit, which is a type of syncarp. This means it is made of many small drupes that have grown together. The fruit is roughly spherical and bumpy, resembling a large, immature orange. It is about the diameter of a softball and turns yellow-green in the fall. If the fruit is cut or damaged, it excretes a sticky white latex. This milky liquid is part of the fruit's chemical makeup.

Maclura pomifera fruit sprouting seeds
Maclura pomifera fruit sprouting seeds

Scientists have debated how the Osage orange spreads its seeds. In 1982, ecologists Daniel H. Janzen and Paul S. Martin proposed a theory. They suggested the fruit might be an evolutionary anachronism. This means the fruit may have coevolved with large animals that are now extinct. They thought animals like mammoths, mastodons, or ground sloths once ate the fruit. These animals would then spread the seeds across the land. This idea remains controversial because there is no direct empirical evidence.

Maclura pomifera in Kansas winter
Maclura pomifera in Kansas winter

History shows that the tree has been useful to many people. Early French settlers called it bois d'arc, which means "bow-wood." This name came from observing Native Americans using the wood for bows and war clubs. The Osage Nation also highly esteemed the wood for bow-making. The Comanche people used the wood for bows as well. They liked it because it was strong, flexible, and durable. The wood is heavy and hard, with a specific gravity of 0.7736.

Maclura trunk
Maclura trunk

American settlers also used the tree for practical purposes. They planted the trees as hedges to protect gardens and corn fields. By pruning the trees severely, they encouraged many adventitious shoots to grow from the base. These shoots became interwoven to form a dense, thorny barrier. These hedges were "horse-high, bull-strong, and pig-tight." This method of fencing was used until barbed wire was invented in 1874. The wood remains a great source for fence posts today.

The Osage orange also plays a role in larger environmental systems. In 1934, it was part of the Great Plains Shelterbelt project. This was an ambitious plan by the WPA to prevent soil erosion. By 1942, the project included 220 million trees in 30,233 shelterbelts. These trees help modify weather and protect the soil in prairie states. The tree is remarkably resistant to many insect predators and fungal diseases. It continues to be a significant part of the landscape in the United States and Canada.

550 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (5)
File:Maclura pomifera range map.png
Maclura pomifera range map.png
File:Maclura pomifera in Kansas winter.jpg
Maclura pomifera in Kansas winter.jpg
File:Maclura pomifera fruit sprouting seeds.jpg
Maclura pomifera fruit sprouting seeds.jpg
File:Osage orange Maclura pomifera Top.JPG
Osage orange Maclura pomifera Top.JPG
File:Maclura trunk.jpg
Maclura trunk.jpg
More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.