Mecca Aster, Mecca Woodyaster: Xylorhiza cognata (Synonyms: Aster cognatus, Machaeranthera cognata)
Orcutt's Aster, Orcutt's Woody Aster: Xylorhiza orcuttii (Synonyms: Aster orcuttii, Machaeranthera orcuttii)
Desert Aster, Mojave Aster, Mojave Woodyaster: Xylorhiza tortifolia var. tortifolia (Synonym: Haplopappus tortifolius)