Tiarella trifoliata subsp. unifoliata (Hook.) P.M.Kern (Saxifragaceae) is native to Alaska, Alberta, British Columbia, California, Idaho, Montana, Oregon, Washington. Flora of the World documents 2 occurrences across 1 country.
This name is a synonym
Specimens are listed under the accepted name Tiarellatrifoliata var. unifoliata (Hook.) Kurtz
