The sepals are those of Ipomoea indica.
Ipomoea violacea doesn't look anything at all like what is shown, not in any way , shape, manner or form and what wiull likely come as a shock to the otherwise unknowing is that Ipomoea violacea is NEVER violet or any color approaching blue.
Please read my comments on the lower portion of the page in the PlantFiles here:
http://davesgarden.com/guides/pf/go/57559/
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