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Corylus maxima Mill. - Betulaceae - (giant) filbert, Lambersthasel, Lambertnuß
The latin name is not accepted as C.maxima is seen as a form of Corylus avellana.
Deciduous shrub or tree, up to 10mtall, native to southeastern Europe and southwestern Asia. A purple-leaved form is popular as ornamental. C. maxima is cultivated for its large nuts, especially in Turkey.
„…each nut is 1.5–2.5 cm long, fully enclosed in a 3–5 cm long, tubular involucre (husk)“
http://de.wikipedia.org/wiki/Lambertshasel