Beach Vitex (Vitex rotundifolia), or Pohinahina, is indigenous to Hawaii and the west Pacific.
It’s planted in coastal areas such as the one below, because it’s very tolerant of salt, heat, and wind. Posted for Terri’s Flower Hour. See more responses here.
Graham's Island 
The leaves are familiar but not the flower, Graham. Maybe we have a different variety here xx
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It’s a member of the Verbenaceae family, so I imagine there are varieties of this plant in many places. I believe they’re mostly tropical plants though.
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That is a wow of a plant with such lovely flowers. Is it good to hold dunes in place?
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It’s certainly planted in sandy places to prevent erosion, so I imagine it would help hold dunes in place.
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Thought as much
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Lovely plant
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Glad you liked it Sheree.
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A beautiful flowering plant, Graham! It reminds me of a similar one we have in our yard, Dalmatian Toadflax, similar leaf pattern but yellow flowers. Nice that the Beacc vitex is salt tolerant!
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It’s pretty common on the coast and always looks good, even under the toughest conditions.
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