caption: The image shows a black and white drawing of a diagram of different types of leaves on a piece of paper, with the text "1859 birchen diagram of birches" written on it. The diagram is composed of various shapes and sizes of leaves, each with its own unique shape and size. The leaves are arranged in a symmetrical pattern, with some overlapping each other, and the text is written in a bold font. The background of the paper is a light grey color, giving the image a classic, timeless feel.