Iochroma arborescens is a species of flowering plant in the genus Iochroma, belonging to the nightshade family Solanaceae. Formerly it was considered the single species in the monotypic genus Acnistus. Common names include gallinero (= 'henhouse'), mata-gallina (= 'chicken-killer'), fruta-de-sabiá (= 'thrush-fruit'), hollowheart, wild tobacco, siyou, bastard sirio, galán arbóreo, tabaco de monte (= 'mountain tobacco'), nigüito, marieneira, güitite, and tabak djab (= 'devil's tobacco').