Oak (Quercus robur), hazel (Corylus avellana) and hornbeam (Carpinus betulus): fruiting and flowering twigs.… https://www.rawpixel.com/image/13965901/image-plant-tree-artFree Image from public domain licenseGolden-leaved alder (Alnus species): leafy shoot. Chromolithograph, c. 1870, after H. Briscoe. https://www.rawpixel.com/image/13953749/image-plant-tree-artFree Image from public domain licenseAutumn leaves of alder (Alnus species). Watercolour drawing. https://www.rawpixel.com/image/13952702/autumn-leaves-alder-alnus-species-watercolour-drawingFree Image from public domain licenseA hazel or filbert plant (Corylus species): fruiting branch with separate nut and leaf. Watercolour. https://www.rawpixel.com/image/13953369/image-plant-tree-artFree Image from public domain licenseLeaves of birch (Betula species). Pen drawing with pencil. https://www.rawpixel.com/image/13956414/leaves-birch-betula-species-pen-drawing-with-pencilFree Image from public domain licenseLeaves and twigs of lilac (Syringa), box (Buxus) and alder (Alnus). Watercolour, pencil and pen drawings. https://www.rawpixel.com/image/13964252/image-paper-flower-plantFree Image from public domain licenseBirch (Betula species): twigs and catkins. Pen and pencil drawings. https://www.rawpixel.com/image/13970132/birch-betula-species-twigs-and-catkins-pen-and-pencil-drawingsFree Image from public domain licenseA tree, possibly siver birch (Betula pendula). Pencil drawing. https://www.rawpixel.com/image/13974402/tree-possibly-siver-birch-betula-pendula-pencil-drawingFree Image from public domain licenseThree trees, possibly pines (Pinus species), with surrounding vegetation. Lithograph, c. 1822. https://www.rawpixel.com/image/14001879/image-plant-tree-artFree Image from public domain licenseA tree, possibly a silver birch (Betula pendula), with surrounding vegetation. Lithograph, c. 1822. https://www.rawpixel.com/image/14012484/image-plant-book-treeFree Image from public domain licenseHazel twig (Corylus avellana) with an associated insect and its anatomical segments. Coloured etching, c. 1831. https://www.rawpixel.com/image/13984546/image-cartoon-plants-artFree Image from public domain license