From 1915 to 1918, botanist and illustrator Prof. Dr. Pilling created a series of botanical wall charts ('Representatives of native plant families'). It was published by Verlag Friedrich Vieweg & Sohn, Braunschweig, and printed by Lithographische Anstalt von Walter Müller, Gera. The lithograph 'Geranium palustre, Oxalis Acetosella' is plate 17 of the series.