Variations
var. deamii
This perennial has profuse flowers on hairy stems and the ovate leaves are pointed with serrated margins.
 
var. speciosa 
This perennial has lanceolate to falcate shaped leaves with the stem leaves having a coarsely serrated margin.

var. sullivantii
This perennial has large flowers up to 90 mm wide and the broad ovate shaped leaves become progressively smaller up the stem.