Photo: Corylus avellana 8.

Shrub in flower. The easiest way to find hazelnuts in your neck of the woods is to find them when they're in flower. No other hanging bare-branched catkins are quite that shade of yellow. They're also easy to spot by the way they grow. Oulunkylä, Helsinki, Finland. Wild. 2002-03-31.
Corylus avellana L. Engl.: common filbert, hazel, hazelnut, cobnut, European filbert, European hazel, filbert, giant filbert, giant hazel. Deu.: Gewöhnliche Hasel, Haselnuss, Gemeine Hasel, Grosse Hasel, Lambertnuss, Lamberts Hasel. Suom.: euroopanpähkinäpensas, isopähkinäpensas, pähkinäpensas. Sven.: hassel, hasselbuske, filberthassel, hasselnöt, vanlig hassel. Fran.: avelinier, coudrier, noisetier. Port.: aveleira. Span.: avellano, avellano de Lambert. Bot. syn.: Corylus maxima Mill., Corylus pontica K. Koch, Corylus tubulosa Willd.
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Photo: Corylus avellana 8.