Heuchera richardsonii
10 inches tall x 16 inches wide
Greenish flowers on 36 inch tall stems.
Dense mounds of dark green somewhat ruffled foliage. Fall color may have hints of red.
Very hardy and adaptable, northern forms hardy to USDA Zone 2a. Hosts two specialist pollinator bees, Colletes andrewsi and C. aestivalis. C. aestivalis also uses H. americana, I'm not sure if it uses the entire americana complex of species.