Leaves

22 questions · Nature

A single leaf often reveals more about a tree than its whole shape and that is exactly the point here: you see a leaf and name the tree it belongs to. 22 species are waiting for you, from woods and parks across the region. Some leaves are unmistakable: the lobed leaf of the oak, the finger-shaped one of the horse chestnut, the jagged maple leaf everyone knows from the Canadian flag, or the heart-shaped leaf of the lime. Others need a second look: beech, birch, ash, elm, willow, poplar, alder, hornbeam and walnut look more alike at first glance, but differ in margin, veining and shape. Needles count too: spruce, pine, fir, larch and yew can be told apart by length, arrangement and feel. Add to that plane, rowan, ginkgo and black locust. Watch for three things: is the leaf simple or compound? What does the margin look like: smooth, serrated, lobed? And how do the veins run? Did you know that leaves turn yellow and red in autumn because the green chlorophyll breaks down and the pigments underneath become visible?

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Which tree is this leaf from?

Foto: Dmitry Makeev · CC BY-SA 4.0 · Wikimedia Commons

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Oak

Foto: Dominicus Johannes Bergsma · CC BY-SA 3.0 · Wikimedia Commons

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Beech

Foto: Tracy Houston Durrant · CC BY 4.0 · Wikimedia Commons

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Birch

Foto: Gmihail at Serbian Wikipedia · CC BY-SA 3.0 rs · Wikimedia Commons

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Maple

Foto: Rosser1954 Roger Griffith · Public domain · Wikimedia Commons

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Linden

Leaf

Foto: Mike Pennington · CC BY-SA 2.0 · Wikimedia Commons

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Horse chestnut

Leaf

Foto: Sten · CC BY-SA 3.0 · Wikimedia Commons

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Ash

Foto: Chhe (talk) · Public domain · Wikimedia Commons

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Elm

Foto: MPF · CC BY-SA 3.0 · Wikimedia Commons

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Willow

Foto: Christian Fischer · CC BY-SA 3.0 · Wikimedia Commons

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Poplar

Foto: AnRo0002 · CC0 · Wikimedia Commons

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Alder

Foto: Liné1 · CC BY-SA 3.0 · Wikimedia Commons

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Hornbeam

Foto: Dalgial · CC BY-SA 3.0 · Wikimedia Commons

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Walnut

Foto: Simon A. Eugster · CC BY-SA 3.0 · Wikimedia Commons

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Spruce

Foto: Radio Tonreg from Vienna, Austria · CC BY 2.0 · Wikimedia Commons

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Pine

Foto: Nefronus · CC BY-SA 4.0 · Wikimedia Commons

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Fir

Leaf

Foto: Chiswick Chap · CC BY-SA 3.0 · Wikimedia Commons

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Larch

Foto: Mykola Swarnyk · CC BY-SA 3.0 · Wikimedia Commons

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Yew

Foto: Krzysztof Golik · CC BY-SA 4.0 · Wikimedia Commons

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Plane

Foto: User:Borealis55 · Public domain · Wikimedia Commons

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Rowan

Foto: James St. John · CC BY 2.0 · Wikimedia Commons

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Ginkgo

Foto: Ninjatacoshell · CC BY-SA 3.0 · Wikimedia Commons

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Black locust

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