Trillium rivale 'Purple Heart' by Marg Shields
Species native to serpentine the Klamanth Ranges along the California - Oregon line.
I can't remember where I got this information from, but it must have been Jim Archibald's seed catalogue. Archibald seed 1.922.321. 11/2008
(This T.rivale 'Purple Heart' was in an earlier blog before the flowers had opened)