I am very confused as to the naming of this plant. I learned it as Dracaena reflexa (common name 'Song of India') but apparently it has been renamed as Pleomele reflexa. When trying to find out which name is correct I read that the name was changed from Pleomele to Dracaena.
This publication from the University of Florida extension department describes the Pleomele as a discarded synonym or common name. This plant has always been sold as Pleomele but only in the last few years have I seen it classified as a Dracaena for taxonomy purposes.
With the advent of cheap DNA analysis there has been even more flux in the world of botanical taxonomy. What were once species in their own right are often reclassified as a variant of another. Just looking at the Dracaena family you can see that the Cordylines and Liriope have been kicked out and the Pleomeles added in.