A South American plant of the nightshade family, native to regions of Paraguay and Brazil, known for its medicinal properties.
From Guaraní 'ca'i ngua', literally 'false guava'. The term reflects indigenous Guaraní plant nomenclature where 'ca'i' refers to peanut or guava-like fruits and 'ngua' means false or substitute, showing how colonizers adopted native plant classification systems.
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