Answer: Based on your description, it might be a tropical hibiscus, Hibiscus sinensis. Here is a link to photos of some to compare with. You may need to cut and paste the complete url into your browser to make it work correctly.
Or, it might be an anthurium, another tropical plant. Here is a link to a page of photos of this plant.
If it is not one of these, perhaps your local store could tell you which plant it is.
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