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Ipomoea purpurea
Purple
The plant is predisposed to moist and rich soil, but can be found growing in a wide array of soil types.
There is a calyx at the 9 o'clock position and the sepal tips showing along the right center of the photo AND if you know what you're looking for, then you will know this is Ipomoea indica.
this is a type of morning glory flower. to identify it to a species level it would be helpful to get some photos of the leaves and the juctions where the leaves come out from the stem/trunk