Variations 
var. bracteola 
This larger plant has leafy bracts on the scape.

var. concava
This plant has broad (spatulate) leaves.

var. rosa
This plant has flowers that are pink-tinged.

Cultivars
'Bright Edge'
This plant has leaves with a broad yellow margin.

'Variegata'
This plant has blue-green white margined leaves that are tinged pink during winter.