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Acer pseudoplatanus

life science Maturity 9-11 Next article →

The sycamore, known scientifically as *Acer pseudoplatanus*, is a large deciduous tree. Deciduous means it sheds its leaves every year. It is a broad-leaved species that belongs to the maple genus, *Acer*. This genus is part of the larger soapberry family, Sapindaceae. The sycamore is a significant tree because it is very hardy. It can tolerate heavy winds and salty coastal exposure.

Acer pseudoplatanus Chaltenbrunnen
Acer pseudoplatanus Chaltenbrunnen

Because it grows so well, it is used as an ornamental tree in cities. However, its ability to spread quickly means it can also become an invasive species in new lands.

The tree has a very specific way of growing and reproducing. It features a wide, domed crown made of large, palmate leaves. These leaves have five large lobes and a leathery texture. On the underside, thick veins protrude from the leaf surface.

In early summer, the tree produces greenish-yellow flowers. These flowers grow in hanging, branched clusters called panicles. Each panicle can hold between 60 and 100 individual flowers. These flowers are highly attractive to insects because they provide both nectar and pollen.

Acer pseudoplatanus buds 01
Acer pseudoplatanus buds 01

Reproduction in the sycamore involves a complex biological process. The flowers are often described as functionally monoecious or dioecious. This means they contain different types of flowers that act as either male or female. Most flowers are morphologically bisexual, meaning they have both male and female organs. However, they often function as if they were unisexual. To prevent self-pollination, which can lower the vigor of offspring, the tree uses timing. On a single tree, one type of flower might open before the other. This encourages cross-pollination with other trees in the area.

Once the flowers are pollinated, the tree produces specialized fruit. These are called samaras, which are winged seeds. The samaras grow in pairs, and their wings are held at right angles to each other. This angle is a key way to tell them apart from other maple species.

Acer pseudoplatanusAA
Acer pseudoplatanusAA

When the seeds are ripe in autumn, they fall from the tree. The shape of the wing causes the seed to rotate or twirl as it falls. This spinning motion slows the descent and allows the wind to carry the seed further away. This process ensures the new trees do not grow too close to the parent.

Humans have a long history of interacting with the sycamore. The Swedish naturalist Carl Linnaeus first described the species in 1753. He recorded it in his famous work, *Species Plantarum*. The specific name *pseudoplatanus* comes from Ancient Greek. The prefix *pseudo-* means "false." This refers to the fact that the leaves and bark look like plane trees, which belong to the genus *Platanus*. However, they are not closely related. One major difference is that *Acer* leaves are opposite, while *Platanus* leaves are alternate.

Acer pseudoplatanus textura del tronco
Acer pseudoplatanus textura del tronco

The sycamore has a massive global distribution. It is native to Central Europe and Western Asia, spanning from France to Ukraine and Turkey.

Ahornallee zwischen Altweitra und Hörmanns 2017-10
Ahornallee zwischen Altweitra und Hörmanns 2017-10

It was likely introduced to the British Isles by 1500. In the United States, it was introduced around 1870. It has since naturalized in fourteen different U.S. states and several Canadian provinces. In some regions, like Australia and New Zealand, it is considered an environmental weed. This is because it can out-compete the native plants in local forests.

This tree provides many valuable resources for human use. The timber is creamy-white, close-grained, and very hard-wearing. This makes it ideal for making furniture, flooring, and even musical instruments. It is also used for kitchen utensils and firewood. In the spring, the rising sap can be collected. This sap can be processed into a syrup or used to make alcoholic and non-alcoholic drinks. Even bees benefit from the tree, as they collect nectar to produce honey.

RhytismaAcerinumDetailU
RhytismaAcerinumDetailU

Finally, the sycamore plays a vital role in its ecosystem. In its native range, it is part of forests containing birch, beech, and fir. It forms a special relationship with a fungus called *Glomus hoi*. This is an internal arbuscular mycorrhizal association. The fungus grows inside the tree's root cells to help the tree absorb phosphorus from the soil. The tree also supports many animals. For example, the larvae of the sycamore moth use the leaves as a food source. This creates a complex web of life centered around the tree.

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🖼️ Images & Media (7)
File:Acer pseudoplatanusAA.jpg
Acer pseudoplatanusAA.jpg
File:Acer pseudoplatanus Chaltenbrunnen.jpg
Acer pseudoplatanus Chaltenbrunnen.jpg
File:Ahornallee zwischen Altweitra und Hörmanns 2017-10.jpg
Ahornallee zwischen Altweitra und...
File:Acer pseudoplatanus buds 01.jpg
Acer pseudoplatanus buds 01.jpg
File:RhytismaAcerinumDetailU.jpg
RhytismaAcerinumDetailU.jpg
File:Acer pseudoplatanus textura del tronco.jpg
Acer pseudoplatanus textura del tronco.jpg
File:The Martyrs tree - geograph.org.uk - 1277399.jpg
The Martyrs tree - geograph.org.uk - 1277399.jpg
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