Tradescantia spathacea and Tradescantia spathacea variegata (Family: Commelinaceae) are herbaceous plants of which variegata is a variety, subspecies or other categories lower than species. The common type is green with purplish colouration at the margin. The underneath of the leaves is purple. On the other hand the variegata from is having leaves with longitudinal variegation. The leaves look like having parallel green, white and purplish strips
Tradescantia spathacea variegata
The two forms may not exactly "exclusive". Observations show that the variegated form can produce non-variegated wholly purple leaves. When this shoots are planted the can reproduce the variegated form.