Aster Subfamily 1 (Asteraceae): Ray flowers but no disk Flowers
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orange agoseris (Agoseris aurantiaca) -- in August -- Old Fall River Road, Rocky Mountain National Park, CO yellow & orange
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orange agoseris (Agoseris aurantiaca) -- in September -- Trail Ridge Road, Rocky Mountain National Park, CO yellow & orange
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orange agoseris (Agoseris aurantiaca) -- in July -- Zimmerman Lake Trail, Larimer County, CO yellow & orange
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pale agoseris (Agoseris glauca) -- in July -- North Fork Trail, Buckhorn Canyon, Larimer County, CO
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pale agoseris (Agoseris glauca var. dasycephala) -- in August -- Snowy Range, Medicine Bow NF, WY yellow & orange
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pale agoseris (Agoseris glauca var. dasycephala) -- in July -- High Creek Fen Preserve, Park County, CO yellow & orange
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pale agoseris (Agoseris glauca var. dasycephala) -- in May -- Yampa Bench Rd, Dinosaur National Monument, CO yellow & orange
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pale agoseris (Agoseris glauca var. glauca) -- in July -- McCullough Gulch, Summit County, CO yellow & orange
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pale agoseris (Agoseris glauca) -- in June -- Eagle's Nest Open Space, Larimer County, CO yellow & orange
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pale agoseris (Agoseris glauca) -- in August -- Michigan Ditch Trail, Colorado State Forest State Park, CO yellow & orange
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annual agoseris (Agoseris heterophylla var. heterophylla) -- in June -- Steens Mountain Wilderness Area, OR yellow & orange
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annual agoseris (Agoseris heteorphylla var. heterophylla) -- in June -- Steens Mountain Wilderness Area, OR yellow & orange
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false agoseris (Agoseris parviflora) -- in May -- Mill Creek Link Trail, Lory State Park, CO yellow & orange
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false agoseris (Agoseris parviflora) -- in May -- Timber Trail, Lory State Park, CO yellow & orange
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parachute plant (Atrichoseris platyphylla) -- in March -- Milpitas Wash Road, Palo Verde, southern California white & cream
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parachute plant (Atrichoseris platyphylla) -- in March -- Death Valley National Park, CA white & cream
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white tackstem (Calycoseris wrightii) -- in March -- Tonto National Forest, southern Arizona white & cream
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chicory (Cichorium intybus) -- in July -- Boulder County, CO blue & purple
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tapertip hawksbeard (Crepis acuminata) -- in July -- Sand Creek National Landmark, CO yellow & orange
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tapertip hawksbeard (Crepis acuminata) -- in July -- Elko County, NV yellow & orange
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tapertip hawksbeard (Crepis acuminata) -- in July -- Shoshone National Forest, Fremont County, WY
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largeflower hawksbeard (Crepis occidentalis ssp. costata) -- in May -- Left Hand Trail, Boulder County Aster 1 (yellow)
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white hawkweed (Hieracium albiflorum) -- in June -- Old Flowers Road, Roosevelt National Forest, CO white & cream
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white hawkweed (Hieracium albiflorum) -- in July -- Lassen Volcanic National Park, CA
white hawkweed (Hieracium albiflorum) -- in August -- Deadman Road, Red Feather Lakes Area, CO
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orange hawkweed (Hieracium aurantiacum) -- in July -- Grand Teton National Park, WY Aster 1 (yellow)
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yellow hawkweed (Hieracium fendleri) -- in July -- Carter Lake Open Space, Larimer County, CO Aster 1 (yellow)
wooly hawkweed (Hieracium triste) -- in July -- Long Draw Road, Larimer County montane, CO
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wooly hawkweed (Hieracium triste) -- in August -- Crown Point, Roosevelt National Forest, CO yellow & orange
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rattlesnakeweed (Hieracium venosum) -- in April -- Pisgah National Forest, NC yellow & orange western North Carolina
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Canadian lettuce (Lactuca canadensis) -- in August -- Lefthand Canyon, Boulder, CO yellow & orange
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biannual lettuce (Lactuca ludoviciana) -- in July -- Bellvue, CO yellow & orange
biannual lettuce (Lactuca ludoviciana) -- in August -- Pelican Marsh, Fort Collins Natural Area, Larimer County, CO
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prickly lettuce (Lactuca serriola) -- in August -- Eagle's Nest Open Space, Larimer County, CO
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prickly lettuce (Lactuca serriola) -- in August -- Well Gulch Nature Trail, Lory State Park, CO yellow & orange
prickly lettuce (Lactuca serriola) -- in September -- Arthur's Rock Trail, Lory State Park, CO yellow & orange
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blue lettuce (Lactuca tatarica) -- in July -- Sand Creek National Landmark, WY blue & purple
blue lettuce (Lactuca tatarica) -- in September -- Lory State Park, CO
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largeflower skeletonplant (Lygodesmia grandiflora) -- in May -- Yampa Bench Road, Dinosaur NM, CO red & pink -- simple-shaped
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skeletonweed (Lygodesmia juncea) -- in July -- Sportsman Lake Road, WY red & pink
skeletonweed (Lygodesmia juncea) -- in August -- South Valley Loop Trail, Lory State Park, CO red & pink
skeletonweed (Lygodesmia juncea) -- in September -- Bobcat Ridge, a Fort Collins Natural Area, CO red & pink
skeletonweed (Lygodesmia juncea) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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Fendler's desertdandelion (Malacothrix fendleri) -- in April -- Organ Mountains-Desert Peaks National Monument, NM yellow & orange
smooth desertdandelion (Malacothrix glabrata) -- in March -- Palo Verde, southern California yellow & orange
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smooth desertdandelion (Malacothrix glabrata) -- in March -- Death Valley National Park, CA
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Torrey's desertdandelion (Malacothrix torreyi) -- in May -- Black Canyon of the Gunnison National Park, CO
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nodding microseris (Microseris nutans) -- in June -- Eagle's Nest Open Space, Larimer County, CO yellow & orange
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wavyleaf dandelion (Nothocalais cuspidata) -- in April -- South Valley Loop Trail, Lory State Park, CO yellow & orange
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wavyleaf dandelion (Nothocalais cuspidata) -- in April -- Kimmons Trail, Lory State Park, CO yellow & orange
wavyleaf dandelion (Nothocalais cuspidata) -- in April -- Rabbit Mountain, Boulder Open Space, CO yellow & orange
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desert chicory (Rafinesquia neomexicana) -- in March -- US 95 in southern Nevada white & cream
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cutleaf vipergrass (Scorzonera laciniata) -- in May -- Mill Creek Link Trail, Lory State Park, CO yellow & orange
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cutleaf vipergrass (Scorzonera laciniata) -- in April -- South Mesa Trailhead, Boulder County, CO yellow & orange
cutleaf vipergraass (Scorzonera laciniata) --in May -- Redtail Grove Natural Area, Fort Collins, CO
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moist sow-thistle (Sonchus arvensis ssp. uliginosus) -- in August -- Ramsay-Shockey Open Space, Larimer County, CO yellow & orange
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moist sow-thistle (Sonchus arvensis ssp. uliginosus) -- in July -- Red Feather Lakes area, CO yellow & orange
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moist sow-thistle (Sonchus arvensis ssp. uliginosus) -- in August -- Hutton Lake National Wildlife Refuge, southern Wyoming
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moist sow-thistle (Sonchus arvensis ssp. uliginosus) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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spiny sowthistle (Sonchus asper) -- in September -- Lincoln National Forest, NM yellow & orange
spiny sowthistle (Sonchus asper) -- in June -- St. Vrain State Park, CO yellow & orange
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spiny sowthistle (Sonchus asper) -- in September -- Big Thompson Ponds State Wildlife Area, CO yellow & orange
spiny sowthistle (Sonchus asper) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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small wirelettuce (Stephanomeria exigua ssp. exigua) -- in May -- San Juan County, Utah red & pink
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slender-leaf wire lettuce (Stephanomeria tenuifolia) -- in July -- next to I-70 northern Utah red & pink
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horned dandelion (Taraxacum ceratophorum) -- in July -- Hoosier Pass, Park/Summit Counties, CO
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horned dandelion (Taraxacum ceratophorum) -- in August -- Snowy Range, Medicine Bow NF, WY yellow & orange
common dandelion (Taraxacum officinale) -- in March -- Eldorado Canyon State Park, CO yellow & orange
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common dandelion (Taraxacum officinale) -- in June -- Indian Peaks Wilderness, Boulder County, CO
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salsify (Tragopogon dubius) -- in May -- Lory State Park, CO yellow & orange
salsify (Tragopogon dubius) -- in April -- Well Gulch Nature Trail, Lory State Park, CO yellow & orange
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Lindley's silverpuffs (Uropappus lindleyi) -- in April -- Dripping Springs Natural Area, New Mexico yellow & orange
