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Ipomoea parasitica
Caatinga
This is Ipomoea parasitica.
Look at the way the pedicel is reflexing (which does NOT occur on I.nil) and if you look closely (after enlarging the photo enough) you will see the small spines on the stem below the fruit,as this occurs on Ipomoea parasitica but NOT on Ipomoea nil...additionally fruit on I.nil remains fully erect and does nbot reflex at all.