H. 'Saishu Yahato Sito'
Very narrow white margins look neat, delicately edging each leaf.

Alternative: H. 'Allan P McConnell'
Plant Size
  Medium: 13" x 35"  
Leaf
  5" x 2"; green, white margins  
Flower
  Purple  
Parentage
  unknown  
Saishu Yahato SitoSaishu Yahato Sito