Many Genera: Canadanthus, Eurybia, Eucephalus, Symphyotrichum
Few-flowered Aster, Great Northern Aster, Tall Northern Aster, Giant Mountain Aster: Canadanthus modesutus (formerly Aster modestus) -
Brewer's Aster: Eucephalus breweri (formerly Aster breweri or Chrysopsis breweri) -
Smooth Rayless Aster, Siskiyou Rayless Aster: Eucephalus brickellioides (formerly Aster brickellioides) -
Engelmann's Aster: Eucephalus engelmannii (formerly Aster engelmannii) -
Klickitat Aster: Eucephalus glaucescens (formerly Aster glaucescens) -
Gorman's Aster: Eucephalus gormanii (formerly Aster gormanii) -
Cascade Aster: Eucephalus ledophyllus (formerly Aster ledophyllus var. ledophyllus) -
Wayside Aster: Eucephalus vialis (formerly Aster vialis) -
Thick-stemmed Aster, Entire-leaved Aster: Eurybia integrifolia (formerly Aster integrifolius) -
Rough-leaved Aster: Eurybia radulina (formerly Aster radulinus) -
Arctic Aster: Eurybia sibirica (formerly Aster sibiricus) -
Alpine Aster: Oreostemma alpigenum var. alpigenum (Synonyms: Aster alpigenus, Aster alpigenus ssp. alpigenus, Aster alpigenus var. alpigenus, Haplopappus alpigenus -Anderson's Aster: Oreostemma alpigenum var. andersonii (formerly Aster alpigenus var. andersonii) -
Long-leaved Aster: Symphyotrichum ascendens (formerly Aster chilensis ssp. ascendens) -
Northern Bog Aster, Rush Aster: Symphyotrichum boreale (formerly Aster junciformis) -
Western Meadow Aster: Symphyotrichum campestre (formerly Aster campestris) -
Eaton's Aster, Oregon Aster: Symphyotrichum eatonii (formerly Aster eatonii) -
Alpine Leafy Aster: Symphyotrichum foliaceum var. apricum (formerly Aster foliaceus var. apricus) -
Leafy Aster, Leafybract Aster: Symphyotrichum foliaceum var. foliaceum (formerly Aster foliaceus var. foliaceus) -
Leafy Aster, Parry's Aster, Leafybract Aster: Symphyotrichum foliaceum var. parryi (formerly Aster foliaceus var. parryi) -
Western Aster, Western Mountain Aster: Symphyotrichum spathulatum var. intermedium (formerly Aster occidentalis var. intermedius) -
Western Aster, Western Mountain Aster: Symphyotrichum spathulatum var. spathulatum (formerly Aster occidentalis var. occidentalis) - ?
Douglas' Aster: Symphyotrichum subspicatum var. subspicatum (formerly Aster subspicatus var. subspicatus) -