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I don't know if the oblique attachment is the natural condition.I don't know emperor and it is not a name or alternative name ever used to my knowledge in Australia.The picture looks like what I know as haak yip ,due to the smooth skin and disticntive color.Oh Hia is an alternative name that may be the same type and Souey Tung (syn. groff) is a seedling of haak yip that is similar.I think they are used in Taiwan for canning and go by a different name.Out of interest I found what happened to the giant yook ho pow lychees in australia that just all disappeared one day.They all became Sum yee hong.