Populus tremula 2 (Female flowers, picture taken in the Netherlands by R. van der Meijden) Populus tremula 3 (Flowering, picture taken in the Netherlands, in slide collection of NHN-Leiden) Populus tremula 4 (Female catkins, picture taken in Leicester by C.A. Stace) Populus tremula 5 (Fruiting, picture taken in the Netherlands by R. van der Meijden) Populus tremula a (Leafy branch with male and female catkins and flower details, drawing by V. Gordon in Meikle, 1984; BSBI Handbook 4.) Populus tremula b (Leaf, picture by C.A. Stace in Stace, 1997.)
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