Hoary Aster: Dieteria canescens var. canescens (Aster canescens, Aster canescens var. viscosus, Aster shastensis var. glossophyllus, Aster shastensis var. latifolius, Machaeranthera canescens ssp. canescens, Machaeranthera canescens var. canescens, Machaeranthera shastensis var. glossophylla, Machaeranthera shastensis var. latifolia)
Tall Hoary Aster: Dieteria canescens var. incana (Aster attenuatus, Machaeranthera attenuata, Machaeranthera canescens var. incana) -West of Sisters, Oregon and near old Fort Klamath.
Rayless Shasta Aster, Shasta Aster: Dieteria canescens var. shastensis (Synonyms: Aster shastensis var. eradiatus, Dieteria shastensis, Machaeranthera canescens var. eradiata, Machaeranthera canescens var. shastensis, Machaeranthera shastensis var. shastensis)