Aster Subfamily 3.1 (Asteraceae) -- Disk and Yellow Rays -- Genus A to F
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
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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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Chamisso arnica (Arnica chamissonis) -- in August -- Kilpecker Road, Red Feather Lakes Area, Larimer County, CO
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heartleaf arnica (Arnica cordifolia) -- in May -- Lory State Park, CO
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foothills arnica (Arnica fulgens) -- in May -- South Valley Loop Trail, Lory State Park, CO
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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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smallhead arnica (Arnica graciis) -- in August -- Mount Zirkel Wilderness, Jackson County, CO
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broadleaf arnica (Arnica latifolia) -- in August -- Michigan Ditch Trail, Colorado State Forest State Park, CO
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broadleaf arnica (Arnica latifolia) -- in June -- Bridal Veil Falls Trail, RMNP, CO
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broadleaf arnica (Arnica latifolia) -- in June -- Ohio Pass Road, Gunnison County, CO
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hairy arnica (Arnica mollis) -- in July -- Old Fall River Road, Rocky Mountain National Park, CO
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hairy arnica (Arnica mollis) -- in July -- Wheeler Peak Campground, Great Basin National Park, NV
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hairy arnica (Arnica mollis) -- in July -- Montgomery Pass Road, Jackson County, CO
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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Rydberg's arnica (Arnica rydbergii) -- in July -- Vedauwoo Recreation Area, near Laramie, WY
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twin arnica (Arnica sororia) -- in June -- Glacier National Park, MT
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hairyseed bahia (Bahia absinthifolia) -- in April -- Big Bend National Park, Texas
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bluntscale bahia (Bahia pedata) -- in April -- River Road East, Big Bend National Park, Texas
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desert marigold (Baileya multiradiata) -- in April -- Big Bend Ranch State Park, TX
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desert marigold (Baileya multiradiata) -- in April -- Route 54, near Carrizozo, southern New Mexico
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desert marigold (Baileya multradiata) -- in March -- I-15 in southern Utah
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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
lyreleaf greeneyes (Berlandiera lyrata) -- in April -- Organ Mountains-Desert Peaks National Monument, NM
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nodding beggartick (Bidens cernua) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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nodding beggartick (Bidens cernua) -- East Boulder Community Park, Boulder County, 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
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fetid marigold (Dyssodia papposa) -- in September -- Lincoln National Forest, NM
fetid marigold (Dyssodia papposa) -- in August -- Eagle's Nest Open Space, Larimer County, CO
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Acton's brittlebush (Encelia actoni) -- in March -- U.S. 95 in southern Nevada
brittlebrush (Encelia farinosa) -- in March -- Boyce Thompson Arboretum State Park, Arizona
brittlebrush (Encelia farinosa) -- in January -- Joshua Tree National Park, CA
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sticky brittlebush (Encelia resinifera) -- in March -- I-25 in southern Utah
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narrowleaf goldenbush (Ericameria linearifolia) -- in March -- southern Utah
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common yellow sunflower (Eriophyllum lanatum) -- in July -- Humboldt County, Sheldon National Wildlife Refuge, northern Nevada
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common wooly sunflower (Eriophyllum lanatum var. integrifolium) -- in July -- Grand Teton National Park, WY
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