Toxic elephant ear plant identified in São Paulo backyard

A resident of São Bernardo do Campo, Maria Hernandes, discovered a mysterious plant growing in her backyard that she suspected might be toxic. After seeking identification through photos and a letter sent to Globo Rural, agronomist Chukichi Kurozawa confirmed the species as 'orelha-de-elefante-panduriforme' (Alocasia cucullata or similar panduriforme variety) from the Araceae family.

While similar in appearance to the edible 'taioba' plant, this species is highly toxic. The plant contains high concentrations of calcium oxalate crystals. If consumed, the leaves and rhizomes can cause severe burning, itching, and swelling of the mouth, lips, tongue, and throat. In serious cases, the resulting swelling can obstruct airways and require immediate medical treatment. The plant, often grown ornamentally for its large, wrinkled, and wavy leaves, may have arrived in the garden via wind-blown seeds from a nearby property.