J. Sturms Flora von Deutschland, Stuttgart, K. G. Lutz, 1900-1907, Germany, flowers, An illustrated botanical representation of the Calla generalis, showcasing distinct features of the plant. The formal structure includes labeled parts: the leafy stem, a prominent flower, and the characteristic spadix. Surrounding details depict the rhizome and various stages of growth, highlighted through letters a to f. Each section elucidates the morphology of the plant, emphasizing its unique characteristics and contributions to flora studies. The caption notes 'Europäische Calla, Calla generalis' at the bottom, identifying the species depicted.