[Asters: The Genera Canadanthus, Eurybia, Eucephalus, Symphyotrichum in the Cascade Mountain Range of Oregon and Washington]
Larger Western Mountain Aster, Western Aster, Western Mountain Aster
Symphyotrichum spathulatum var. intermedium
Synonyms: Aster occidentalis ssp. intermedius, Aster occidentalis var. intermedius, Aster spathulatus var. intermedius
Paul Slichter