The Nuttall Encyclopedia
A poison-yielding-tree, at one time fabled to exhale such poison that it was destructive to all animal and vegetable life for miles round it.
Wood, James, ed. Entry for 'Upas Tree'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/u/upas-tree.html. Frederick Warne & Co Ltd. London. 1900.