Hardheads, Russian Knapweed, Turkestan Thistle: Acroptilon repens (Synonym: Centaurea repens) -
Pathfinder, Trailplant: Adenocaulon bicolor -
Western Boneset, Western Snakeroot: Ageratina occidentalis (Synonym: Eupatorium occidentale) -
Beach Burs and Ragweeds: The Genus Ambrosia -
Pearly Everlasting, Western Pearly Everlasting: Anaphalis margaritacea -
False Neststraw, Woolly Fishhooks: Ancistrocarphus filagineus (Synonym: Stylocline filaginea) -
Pussytoes: The Genus Antennaria -
Burdock: The Genus Arctium -
Arnicas and Lepordbanes: The Genus Arnica - Several species of Arnicas have disoid flower heads.
Mugworts, Sageworts and Wormwoods: The Genus Artemisia -
Baccharis and Coyote Brush: The Genus Baccharis -
Beggarticks: The Genus Bidens -
Tasselflowers: The Genus Brickellia -
Silvercrown: The Genus Cacaliopsis -
Thistles: The Genus Carduus -
Distaff Thistles and Safflowers: The Genus Carthamus -
Cornflowers, Knapweeds and Starthistles: The Genus Centaurea -
Dustymaidens and False Yarrow: The Genus Chaenactis -
Thistles: The Genus Cirsium -
Blessed Thistle: Cnicus benedictus (Synonym: Centaurea benedicta) -
Brass Buttons and Cotula: The Genus Cotula -
Burweed Marsh Elder, Carelessweed, Tall Marsh Elder: Cyclachaena xanthifolia (Synonym: Iva xanthifolia) -
German Ivy, Cape Ivy: Delairea odorata (Synonym: Senecio mikanioides) -
Burnweeds and Fireweeds: The Genus Erechtites -
Goldenweeds and Rabbitbrush: The Genus Ericameria -
Fleabanes Lacking Rayflowers: The Genus Erigeron -
Cudweeds: The Genus Euchiton (Synonym: Gnaphalium) -
Cottonroses and Cudweeds: The Genus Filago (Synonym: The Genus Logfia) -
Cudweeds:The Genus Gnaphalium (Synonym: The Genus Pseudognaphalium) -
Whitney's Bristlehead, Whitney's Goldenweed: Hazardia whitneyi var. discoidea (Synonym: Haplopappus whitneyi ssp. discoideus) -
Hesperevax: The Genus Hesperevax -
Oregon Goldster: Heterotheca oregona var. oregona
Littleleaf Luina, Little-leaf Silverback, Silverback Luina: Luina hypoleuca -
Disc Mayweed, Pineapple Weed: Matricaria discoidea (Synonyms: Chamomilla discoidea, Chamomilla suaveolens, Matricaria matricarioides, Santolina suaveolens) -
Cottontop, Q-tips, Slender Cottonseed, Slender Cottonweed: Micropus californicus var. californicus -
Cotton Thistle, Scotch Cottonthistle, Scotch Thistle, Scots Thistle: Onopordum acanthium ssp. acanthium -
Butterburs and Coltsfoots: The Genus Petasites -
Cudweeds: The Genus Pseudognaphalium
Woollyheads: The Genus Psilocarphus -
Narrowhead Goldenweed: Pyrrocoma carthamoides var. cusickii (Synonyms: Haplopappus carthamoides ssp. cusickii, Haplopappus carthamoides var. cusickii) - Ray flowers very reduced or obscure. The flower head may appear discoid.
Silky Raillardella, Silvery Raillardella: Raillardella argentea -
False Silverback, Rainiera, Tongue-leaved Luina: Rainiera stricta (Synonym: Luina stricta) -
Western Black-eyed Susan, Western Chocolate Black-eyed Susan, Western Chocolate Cone, Western Coneflower: Rudbeckia occidentalis (Synonyms: Rudbeckia occidentalis var. montana, Rudbeckia occidentalis var. occidentalis) -
American Sawwort, American Saw-wort: Saussurea americana -
Butterweeds, Groundsel and Ragworts: The Genera Packera and Senecio -
Milk-thistle, Milk Thistle, Blessed Milk-thistle: Silybum marianum -
Prickly Soliva, Common Soliva, Field Burrweed, Perennial Sow-thistle, Corn Sow-thistle: Soliva sessilis (Synonym: Soliva pterosperma) -
Feverfew and Tansy: The Genus Tanacetum -
Cockleburs: The Genus Xanthium -