Tardiva
H. tardiva
Narrow shiny green leaves, questionable if this is a true species or not, does not set seed. Also known as Nankai Giboshi, Late Plantainlily.

Alternative: H. 'Nicola'
Plant Size
  Medium: 16" x 32"  
Leaf
  6" x 3"; dark green  
Flower
  Purple with white margins  
Parentage
  Species from Japan, disputed  
tardivatardiva