Viewing post #1286860 by Horntoad

sooby said:According to Mobot, Tradescantia 'Purple Heart' is a cultivar synonymous with 'Purpurea'
http://www.missouribotanicalga...

That's not exactly how I interpret it. The quote is

"Tradescantia pallida (synonymous with Setcreasea purpurea) is native to Mexico. In tropical and semi-tropical areas, it is commonly grown outdoors as a popular, albeit weedy, ground cover. It is commonly called purple heart."

So Purple Heart is the common name for the species Tradescantia pallida.
The next part of the statement is

‘Purpurea’ (sometimes sold as ‘Purple Heart’) is a cultivar that features purple foliage which is superior to that of the species.

The key here is "sometimes sold as", so Tradescantia pallida 'Purpurea' should have Purple Heart listed as under "also sold as". But for the straight species Tradescantia pallida it should only be listed as a common name not a separate cultivar.