When most people say Rotala 'sunset', they mean one of the red versions of Rotala ramosior.
What you have is R. rotundifolia, a common species with many different color and growth forms. You never know with trade names, so maybe somebody has been calling a form of rotundifolia that. Your best bet is probably to get some from somebody selling home grown stuff in the sale forums if you want the ramosior.
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