Queen’s Wreath (Petrea volubilis) is also known as Purple Wreath and Sandpaper Vine. It’s a native of tropical America, though not Hawaii. The plant can take the form of a vine or shrub. This one was more of a shrub. The blooms are prolific and can occur twice a year.
Graham's Island 
They are just called petrea here – I had not heard the other two names before, but I fully understand the name sandpaper vine. Being scraped by the rough stems can leave burn-like welts, but the colour is indeed gorgeous.
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Now I want to rub one!
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It is beautiful, I love the colour!
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It does make a good show of color.
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Lovely colour! Our jacaranda trees are just flowering and the colour is very similar.
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The jacarandas are blooming here too and, you’re right, the color is very similar.
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Charming
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Pretty weed 😊
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Definitely a potential weed, but popular here as an ornamental.
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Oh no, that spells disaster
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