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Walnut (Juglans)

Family:

walnut (Juglandaceae)

Flowering period:

April to May

Distribution:

in both Old and New World, generally in temperate to subtropical climates of the northern hemisphere

Appearance:

deciduous trees or shrubs, leaves alternate and odd-pinnate, the leaves smell and are large, the leaf margin may be serrated or entire, male drooping catkins have no stalk, female flowers are clustered in large numbers in a spike, the furrowed nut is surrounded by a thick outer jacket and a woody nutshell

Allergenicity:

low, however the nuts are important in the context of food allergies

Link zum Pollenatlas: Juglans regia

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.

Male flowers (Image rights: Katharina Bastl)
Male flowers (Image rights: Katharina Bastl)
Female flowers (Image rights: Katharina Bastl)
Female flowers (Image rights: Katharina Bastl)
Leaves with nuts (Image rights: Katharina Bastl)
Leaves with nuts (Image rights: Katharina Bastl)
Walnut (Image rights: Helmut Zwander)
Walnut (Image rights: Helmut Zwander)
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