Some trees are very, very tall.
They stay green all year. They make big cones. These cones can fall from high up.
They are very old trees. Can you find a tall tree?
Some trees are very, very tall.
They stay green all year. These trees grow big cones. Some cones are as heavy as a pineapple.
They can fall from very high up. This can hurt a person. These trees are very old. They lived a long time ago. Most of them live in the south part of the world.
They make seeds that fly in the wind. It is amazing to see such big trees!
Araucariaceae is a family of tall evergreen trees.
They stay green all year long. Most of these trees live in the Southern Hemisphere. They used to grow all over the world a long time ago. There are three main groups in this family. These groups are Araucaria, Agathis, and Wollemia.
These trees can grow very large. One tree in New Zealand is named Tāne Mahuta. It is a kauri tree from the Agathis group. It is one of the biggest conifers in the world.
These trees make cones. Some trees have both male and female cones. Other trees have only one kind. The male cones are often very large. They hang down from the branches. The female cones are also big. They can be round like a ball. When they are ready, they fall to the ground. Some cones can weigh as much as a large pineapple. They can hurt people if they fall from high up. The seeds from these cones use wings to fly in the wind.
Araucariaceae is a family of tall evergreen trees.
These trees stay green all year long. Most of them live in the Southern Hemisphere today. You can find them in places like Australia and New Zealand. They also grow in New Caledonia and parts of South America. Long ago, they grew all over the Northern Hemisphere too.
They were very common during the Jurassic and Cretaceous periods. These ancient times were when dinosaurs ruled the Earth.
These trees have a very special way they grow. They often have tall, straight trunks. The branches usually grow in layers or circles around the stem.
The leaves can look like small needles or large, flat shapes. To make new trees, they grow cones. Some trees have both male and female cones on one plant. Other trees are dioecious, which means they have only one kind. Male cones are often long and hang down from the branches. Female cones are round and sit upright on short shoots.
When the female cones are ready, they fall to the ground. Their seeds have little wings to help them fly in the wind.
Scientists have studied these trees for a long time. They found fossils that show these trees are very old. Some fossils date back to the Early Jurassic period. One amazing discovery happened in 1994. This was when people found the living Wollemia species. Before that, scientists only knew about them from fossil remains.
This was a very big surprise for the world of science.
There are 41 known species in this family. They belong to three main groups called genera. These groups are Araucaria, Agathis, and Wollemia.
One very famous tree is named Tāne Mahuta. It is a kauri tree from the Agathis group in New Zealand. This tree is massive and has a huge diameter. It is the third-largest conifer in the world by wood volume.
Another tree, the bunya-bunya, has cones as heavy as a large pineapple.
Many people use these trees in their daily lives. Some people plant them in gardens because they look beautiful. Others use the wood to make high-quality items. Some seeds even taste like pine nuts and can be eaten. In Turkey, people use fossilized wood called Oltustone.
They turn this black, fossilized wood into shiny jewelry. This shows how even ancient plants can be part of our world today.
Araucariaceae is a family of conifers that includes some of the most impressive trees on Earth.
These evergreen trees are known for their massive size and unique structures. Today, the family is mostly found in the Southern Hemisphere. You can find them in places like Australia, New Zealand, and New Caledonia. Some species also grow in South America and parts of Malesia. In the past, these trees were much more widespread. They once grew across the Northern Hemisphere during the Jurassic and Cretaceous periods.
The physical structure of these trees is quite distinct. Most members are extremely tall evergreen trees with columnar trunks. They often have large piths and resinous cortices, which are the outer layers of the stem. The branches typically grow in horizontal, tiered layers. These branches often arise in whorls, meaning they circle the stem in groups of three to seven. The leaves vary depending on the species. Some are small, curved, and needle-like. Others are large, flat, and broadly ovate. These leaves are arranged spirally and usually have parallel venation.
To reproduce, Araucariaceae trees produce cones. Some trees are monoecious, meaning a single tree carries both male and female cones. Most are dioecious, meaning a tree carries only one type. Male cones are often among the largest in the conifer world. They are cylindrical, drooping, and look somewhat like catkins. These cones contain many sporophylls, which are leaf-like structures. Each sporophyll has four to 20 pollen sacs on its lower surface. The pollen grains are round and lack wings or air sacs.
Female cones are also very large and have a different shape. They are spherical or ovoid and grow upright on short, thick shoots. These cones consist of many bracts and scales. In these trees, the scales usually bear only one seed on their upper surface. This is different from true pines, which usually have two seeds per scale. The seeds are among the largest in the conifer group. They use wing-like structures to disperse via the wind. When they are mature, the female cones detach and fall to the ground.
Because these cones are so heavy, they can be dangerous. For example, the cones of the bunya-bunya tree can weigh up to 10 kilograms. That is roughly the weight and size of a large pineapple. These cones can drop from heights of 30 meters.
One of the most famous individuals is a New Zealand kauri tree named Tāne Mahuta. This Agathis australis tree has a massive diameter at breast height. Its total wood volume makes it the third-largest conifer in the world. It follows only the Sequoia and Sequoiadendron in this ranking.
The history of this family is revealed through a deep fossil record. The oldest definitive records date back to the Early Jurassic. Fossils of their wood, leaves, and pollen have been found globally. A major scientific event occurred in 1994 with the discovery of the Wollemia nobilis. Before this, scientists only knew this species from fossil remains.
Today, the family is divided into three living genera: Araucaria, Agathis, and Wollemia. There are about 41 living species in total. New Caledonia is a major center for them, hosting 18 different species.
Humans have found many ways to use Araucariaceae. Some species are popular as ornamental trees in subtropical gardens. Others provide high-quality timber for building. Some species even produce edible seeds that are similar to pine nuts. They also produce valuable resin and amber. In the Erzurum Province of Turkey, people use fossilized wood called Oltustone.
This "Black Amber" is actually fossilized trunks of Araucariaceae. Artisans polish it to create a beautiful black sheen for jewelry. This connects ancient biological history to modern human craft.
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