Hoary-aster, Hoary Aster: Dieteria canescens var. canescens (Synonyms: Aster canescens, Aster shastensis var. glossophyllus, Aster shastensis var. latifolius, Aster canescens var. viscosus, Machaeranthera canescens var. canescens, Machaeranthera canescens ssp. canescens, Machaeranthera shastensis var. glossophylla, Machaeranthera shastensis var. latifolia)
Hoary-aster, Hoary Aster, Tall Hoary Aster: Dieteria canescens var. incana (Synonyms: Aster attenuatus, Diplopappus incanus, Machaeranthera attenuata, Machaeranthera canescens var. incana, Machaeranthera incana)
Small Leaf Hoary Aster: Dieteria canescens var. leucanthemifolia (Synonym: Machaeranthera canescens var. leucanthemifolia)
Rayless Shasta Aster: Dieteria canescens var. shastensis (Synonyms: Aster shastensis var. eradiatus, Machaeranthera canescens var. shastensis, Machaeranthera shastenis var. eradiata, Machaeranthera shastensis var. shastensis)