Bernard Castelein / Frosted leaf of English oak tree (Quercus robur) Belgium

Bernard Castelein / Red Oak (Quercus rubra) leaf close up, changing colour, Belgium

Juergen Freund / La Mancha, Spain, Europe

Bernard Castelein / Larch tree in snow field, Alpes Maritimes, France

Bernard Castelein / Sweet-flag {Acorus calamus} introduced from Turkey now naturalised in Europe by rivers