Ivesias of the Cascade Mountains of Oregon and Washington

The Genus Ivesia

Gordon's Ivesia: Ivesia gordonii var. gordonii (Synonyms: Horkelia gordonii, Horkelia gordonii var. alpicola, Ivesia alpicola, Potentilla gordonii) -

Tweedy's Ivesia, Tweedy's Mousetail: Ivesia tweedyi (Synonym: Horkelia tweedyi var. alpicola) -