Bitter melon (Momordica charantia) hails from Africa in the distant past, but has spread across the globe. The small flowers are a delicate shade of yellow and are followed by somewhat spiky fruits. These are widely used in cooking, particularly in Asia, but only when the fruit is green. The ripe orange fruits are not edible.
Graham's Island 
I have them here at times. Not seen one in a while though
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I hadn’t seen this before, but I guess it’s not as rampant a spreader as some plants.
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Never seen those before!
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First time I had too, but they’re fairly common I think.
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