Aster (asteraceae) Subfamily 3.1 -- Disk and Yellow Rays -- Genus A to F
shrubs, trees, vines, cactus, agave, aquatic --- rounded clusters --- elongated clusters --- Aster 1 (yellow) ---
Aster 3.1, Aster 3.2, Aster 3.3, Aster 3.4 --- odd-shaped flowers --- simple-shaped flowers (in the yellow and orange category)
Aster 3.1, Aster 3.2, Aster 3.3, Aster 3.4 --- odd-shaped flowers --- simple-shaped flowers (in the yellow and orange category)
Aster 3.1 (Genus A to F) -- Aster 3.2 (Genus G to O) -- Aster 3.3 (Genus P to R) -- Aster 3.4 (Genus S to Z)
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fernleaf yarrow (Achillea filipendulina) -- in August -- Prospect Ponds/CSU ELC, Fort Collins, CO
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ragleaf bahia (Amauriopsis dissecta) -- in July -- Cub Lake Trail, Rocky Mountain National Park, CO CO-RMNP
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ragleaf bahia (Amauriopsis dissecta) -- in August -- Hermit Park Open Space, Larimer County, CO
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Chamisso arnica (Arnica chamissonis) -- in July -- Rollins Pass Road, Gilpin County, CO
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heartleaf arnica (Arnica cordifolia) -- in May -- Lory State Park, CO CO-LSP
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foothills arnica (Arnica fulgens) -- in May -- South Valley Loop Trail, Lory State Park, CO CO-F
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foothills arnica (Arnica fulgens) -- in May -- Mesa Trail, South Mesa Trailhead, Boulder County, CO
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foothills arnica (Arnica fulgens) -- in July -- Buffalo Pass Road, Jackson County, CO
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broadleaf arnica (Arnica latifolia) -- in August -- Michigan Ditch Trail, Colorado State Forest State Park, CO CO-A
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hairy arnica (Arnica mollis) -- in July -- Old Fall River Road, Rocky Mountain National Park, CO CO-A
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hairy arnica (Arnica mollis) -- in July -- Wheeler Peak Campground, Great Basin NP, NV
hairy arnica (Arnica mollis) -- in August -- Snowy Range, Medicine Bow National Forest, WY WY-SR
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hairy arnica (Arnica mollis) -- in July -- Rollins Pass Road, Gilpin County, CO
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twin arnica (Arnica sororia) -- in June -- Glacier National Park, MT MT-N
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hairyseed bahia (Bahia absinthifolia) -- in April -- Big Bend National Park, Texas TX-BB
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bluntscale bahia (Bahia pedata) -- in April -- River Road East, Big Bend National Park, Texas TX-BB
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desert marigold (Baileya multiradiata) -- in April -- Big Bend Ranch State Park, TX TX-BBR
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desert marigold (Baileya multiradiata_ -- in April -- Route 54, near Carrizozo, NM NM-S
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desert marigold (Baileya multradiata) -- in March -- I-15 in southwest Utah UT-S
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arrowleaf balsamroot (Balsamorhiza sagittata) -- in May -- Sand Creek National Landmark, CO/WY WY-SC
arrowleaf balsamroot (Balsamorhiza sagittata) -- in June -- Sand Creek, WY
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lyreleaf greeneyes (Berlandiera lyrata) -- in July -- Bosque del Apache National Wildlife Refuge, NM NM-S
lyreleaf greeneyes (Berlandiera lyrata) -- in April -- Organ Mountains-Desert Peaks National Monument, NM
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devil's beggartick (Bidens frondosa) -- in September -- Big Thompson Ponds State Wildlife Area, CO
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plains coreopsis (Coreopsis tinctoria) -- in August -- North Shields Ponds, a Fort Collins Natural Area, CO
fetid marigold (Dyssodia papposa) -- in June -- Coyote Ridge Natural Area, Fort Collins, CO CO-F
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fetid marigold (Dyssodia papposa) -- in September -- Lincoln National Forest, NM
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Acton's brittlebush (Encelia actoni) -- in March -- U.S. 95 in southern Nevada NV-S yellow & orange
brittlebrush (Encelia farinosa) -- in March -- Boyce Thompson Arboretum State Park, Arizona yellow & orange AZ-SRN
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sticky brittlebush (Encelia resinifera) -- in March -- I-25 in southwest Utah UT-S yellow & orange
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narrowleaf goldenbush (Ericameria linearifolia) -- in March -- southern Utah yellow & orange
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common yellow sunflower (Eriophyllum lanatum) -- in July -- Humboldt County, Sheldon NWR, NV NV-N