Reminds me of 'Yata no Kagami', especially the flower shape. But the thing I am not sure about is the purple shade of the blotch compared to the red of the petal. I have never seen 'Yata no Kagami' in person, but on the pictures it seems the blotch is a red shade, not a purple one. Also, in your case the white is at the center of the flower. 'Yata no Kagami' has it from the center of the petals aka tamafu. But it also does the white centers sometimes.
But I have before seen pictures of flowers that look like 'Yata no Kagami' but that have a purple blotch. Usually, those are solid reds. Often the Yata no Kagami pictures you see are of plants or branches that have a lot of the tamafu appearing.
But because this is one of the most common varieties, I suspect it is correct and that there might be some variation. All Yata no Kagami go back to an original seedling a long time ago. And from that, all others were asexually propagated. Or it could be that different camera's display the shade of the blotch very different.
I think it is probably a form of R.indicum and popular because of the small leaves and the autumn colour on the leaves.