upas

In Malay, upas means poison, and the upas tree (Antiaris toxicaria) is indeed poisonous. Its latex contains cardiac glycosides that Javanese and Bornean peoples used to tip blowdart needles and arrows. The poison is real. But the legend that grew around it in Europe was not. In 1783, a Dutch surgeon named J.N. Foersch published an account claiming that the upas tree killed all life within a fifteen-mile radius — birds fell from the sky, no grass grew, and criminals sentenced to collect its sap rarely returned alive.

Foersch's account was fiction, but Europe believed it. Erasmus Darwin (Charles Darwin's grandfather) included the upas tree in his 1791 poem The Loves of the Plants, and the image spread through Romantic literature. The upas became a symbol of tropical malevolence — proof that the East Indies harbored dangers beyond European comprehension. Alexander Pushkin wrote a poem called 'The Upas Tree' in 1828, using it as a metaphor for despotism.

The real Antiaris toxicaria is a tall, handsome fig-family tree that grows in tropical forests from Sri Lanka to Polynesia. Its latex is toxic but not uniquely so — many tropical plants are more dangerous. Birds nest in its branches. Other trees grow beside it. The fifteen-mile kill zone was pure invention, but it told Europeans what they wanted to hear about the dangerous, unknowable tropics.

The Malay word upas entered English dictionaries in the 1780s and stayed. By the Victorian era, 'upas tree' had become a metaphor for any source of corruption or moral poison — a political upas tree, an upas of slavery. The metaphor outlived the myth. Few people now remember Foersch's hoax, but the Malay word for poison still carries the residue of a European fantasy about the lethal East.