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Tree of heaven (Ailanthus)

Family:

bitter ash (Simaroubaceae)

Flowering period:

July to August

Distribution:

originally native to China and Vietnam, now cultivated almost everywhere in the world (Europe, America, Africa, Australia), sometimes invasive, in temperate or Mediterranean climate

Appearance:

medium-sized trees, pioneer plant because it can also be found in low-nutrient, dry locations, the grey-brown bark develops a diamond-shaped pattern as the tree ages, odd-pinnate leaves, leaflets elongated to oval, glands in the leaf base secrete sugars which attract ants, leaves do not change colour in the autumn and drop late in autumn, flowers are yellow with a strong smell, spirally twisted fruit with a central seed

Allergenicity:

a new potential allergen, skin reactions have already been described

Link zum Pollenatlas: Ailanthus altissima

Wissenschaftlicher Beirat:
Ass. Prof. Dr. Siegfried Jäger (Medizinische Universität Wien)
Univ. Prof. Dr. Reinhart Jarisch (Floridsdorfer Allergie Zentrum)
Mag. Matthias Werchan (Charité Berlin)
Prof. Dr. med. Karl-Christian Bergmann (Charité Berlin)

Quellen:

Österreichischer Pollenwarndienst, Medizinische Universität Wien, Österreich
Charité, Allergie-Zentrum-Charité, Klinik für Dermatologie, Venerologie und Allergologie, Berlin, Deutschland
Wikipedia
www.alles-zur-allergologie.de
22 Jahre Blüh- und Fruktifikationsuntersuchungen der Waldbaumarten im Lehrforst Ofenbach/Rosalia. R. Litschauer. 2010. Bundesforschungs- und Ausbildungszentrum für Wald, Naturgefahren und Landschaft, BFW-Berichte 144, 36 pp.
Waldbau auf soziologisch-ökologischer Grundlage. H. Mayer 1977. Gustav Fischer Verlag, Stuttgart – New York, 482 pp.

Flowers (Image rights: Helmut Zwander)
Flowers (Image rights: Helmut Zwander)
Habit (Image rights: Helmut Zwander)
Habit (Image rights: Helmut Zwander)
Fruit (Image rights: Helmut Zwander)
Fruit (Image rights: Helmut Zwander)
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