Milfoil, Yarrow: Achillea millifolium (Synonyms: Achillea borealis, Achillea lanulosa, Achillea lanulosa var. eradiata, Achillea lanulosa var. lanulosa, Achillea millefolium var. alpicola, Achillea millefolium var. californica, Achillea millefolium var. lanulosa, Achillea millefolium ssp. lanulosa, Achillea millefolium var. litoralis, Achillea millefolium var. millefolium, Achillea millefolium var. occidentalis, Achillea millefolium var. pacifica)
Corn Chamomile, Dogfennel, Field Chamomile: Anthemis arvensis (Synonym: Anthemis arvensis var. arvensis)
Arnicas: The Genus Arnica in Mt. Adams Country
Asters: The Genus Asterin Mt. Adams Country
Balsamroots: The Genus Balsamorhizain Mt. Adams Country
Nodding Beggarticks, Nodding Beggar Ticks, Bur Marigold: Bidens cernua (Synonyms: Bidens cernua var. cernua, Bidens cernua var. elliptica, Bidens cernua var. minima)
Columbia River Fleabane, Hall's Goldenweed: Columbiadoria hallii (Synonym: Haplopappus hallii)
Canada Fleabane, Canadian Fleabane, Horseweed: Conyza canadensis (Synonyms: Conyza canadensis var. canadensis, Conyza canadensis var. glabrata) - This has flowerheads with rays absent or minute rays, so it might key here or with the flowerheads that are discoid.
Gold Stars, Spring Gold: Crocidium multicaule -
Goldenweeds: The Genus Ericameriain Mt. Adams Country
Fleabanes: The Genus Erigeronin Mt. Adams Country
Woolly Sunflowrs: The Genus Eriophyllum in Mt. Adams Country
Blanket Flower, Great-flowered Gaillardia: Gaillardia aristata
Columbia Gumplant, Oregon Gumplant, Coastal Gumweed, Columbia Gumweed, Idaho Gumweed, Low Gumweed, Resinweed: Grindelia hirsutula (Synonyms: Synonyms: Grindelia arenicola, Grindelia columbiana, Grindelia integrifolia var. macrophylla, Grindelia nana, Grindelia nana ssp. columbiana, Grindelia nana ssp. nana, Grindelia nana var. discoidea, Grindelia nana var. integerrima, Grindelia nana var. integrifolia, Grindelia nana var. nana, Grindelia squarrosa var. quasiperennis, Grindelia stricta ssp. stricta, Grindelia stricta var. stricta)
Douglas' Sunflower, Little Sunflower, False Sunflower, Oneflower Helianthella, Douglas' Helianthella: Helianthella uniflora var. douglasii
Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)
Dwarf Alpinegold, Dwarf Hulsea: Hulsea nana (Synonym: Hulsea nana var. larsenii)
Hareleaf, Rabbitleaf: Lagophylla ramosissima -
Oxeye Daisy: Leucanthemum vulgare (Synonyms: Chrysanthemum leucanthemum, Chrysanthemum leucanthemum var. pinnatifidum)
Tarweeds: The Genera Hemizonella and Madia in Mt. Adams Country
Butterweeds & Groundsels: The Genus Senecioin Mt. Adams Country
Goldenrods: The Genus Solidagoin Mt. Adams Country
Lyall's Goldenweed, Lyall's Serpentweed: Tonestus lyallii (Synonym: Haplopappus lyallii)
Mule's-ears: The Genus Wyethiain Mt. Adams Country