The Indian summer is an expression whose origin remains quite vague. It is heard in the 18th century in North America and linked to a period of temporary warming during fall. But here, the photo was taken in Rio Grande in the south of Brazil. Temperatures stay high. Although my skills in botany are limited to the recognition of tulips and daisies of my garden, I believe that trees are fig trees, sometimes called in Guadeloupe and Martinique "cursed fig tree", "cursed tree" or "strangler fig".
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