Corylus

Meikle, R.D. 1985: Flora of Cyprus 2
but modified
1Involucre scarcely exceeding nut, campanulate, not constricted; nut 1.5-2 x 1-1.5 cm
1'Involucre much exceeding nut (about twice as long), and distinctly constricted about the middle; nut often 2.5-3 x 1.5 cm