 A common cultivar responsible for most commercially available plants is derived from the naturally occurring interspecific hybrid (nothospecies) "Tradescantia × andersoniana", an invalid name more correctly referred to as 'Andersoniana Group' since it includes several cultivars, the origins of which are complex.The group was derived from naturally occurring cross-pollination between "Tradescantia virginiana", "T. ohiensis", and "T. subaspera" in overlapping ranges within continental North America.They share a number of characteristics, although they differ in flower colour.