Warming, Johannes Eugenius Bülow (yōhänˈəs ĕŏgāˈnēŏs büˈlou värmˈĭng) [key], 1841–1924, Danish botanist, a founder of the science of plant ecology. He was a professor at the Univ. of Copenhagen (1885–1911) and wrote a pioneer work in his field, Plantesamfund (1895), which, rewritten and enlarged, appeared in English as Oecology of Plants (1909). He also wrote A Handbook of Systematic Botany (1878; tr., 2d ed. 1904).