Argemone glauca is an endemic plant, known in Hawaii as Pua Kala or Hawaiian Prickly Poppy. It favors the hot, dry, and sunny conditions on the west side of the island and can grow anywhere from the coast, where these were, all the way up to subalpine areas of the volcanoes.
Graham's Island 
Nice to see one of Hawaii’s endemic plants!
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There’s another argemone plant in Hawaii that’s from Mexico. It looks very similar, but has a yellow flower
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Seems that Hawaii has been forced to be very hospitable!
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That’s true.
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