What is this plants with cup like flowers? Are the cups flowers or something else?
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I think it's a Cestrum nocturnum' or night blooming jasmine which has finished flowering. If the flowers are successfully pollinated, then berries will be produced, so it looks like yours weren't pollinated. It's a tropical climber and grows wild outdoors in places like the Caribbean, but can be kept as a houseplant, though it does need repotting periodically to allow it to grow on a bit. Information on this plant here https://homeguides.sfgate.com/nightblooming-jasmine-plant-care-38078.html