Decorata Normalis
H. 'Decorata Normalis'
Oval dark green leaves, slightly stoloniforous. The RHS Plant Finder lists this cultivar as a species, H. decorata var. normalis

Alternative: H. 'Dorothy'
Plant Size
  Medium: 15" x 42"  
Leaf
  6" x 4", dark green  
Flower
  Violet  
Parentage
  Sport of H. 'Decorata'  
Decorata NormalisDecorata Normalis