Aster (Asteraceae) Sub-Family 4: only disk flowers
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flatspine bur ragweed (Ambrosia acanthicarpa) -- in March -- Iron County, southern Utah green & brown
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western ragweed (Ambrosia psilostachya) -- in July -- Bellvue, Larimer County, CO
western ragweed (Ambrosia psilostachya) -- in July -- Mill Creek Link Trail, Lory State Park, CO green & brown
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western ragweed (Ambrosia psilostachya) -- in August -- Orchard Cove Trail, Lory State Park, CO green & brown
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western ragweed (Ambrosia psilostachya) -- in August -- Bobolink Trail, Boulder County, CO
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burrobrush (Ambrosia salsola var. salsola) -- in March -- I-15 in southern Utah white & cream
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skeletonleaf bur ragweed (Ambrosia tomentosa) -- in September -- Fossil Creek Reservoir, Fort Collins NA, CO green & brown
skeletonleaf bur ragweed (Ambrosia tomentosa) -- in September -- Orchard Cove Trail, Lory State Park, CO
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great ragweed (Ambrosia trifida) -- in August -- Well Gulch Nature Trail, Lory State Park green & brown
great ragweed (Ambrosia trifida) -- in September -- Well Gulch Nature Trail, Lory State Park, CO
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pearly everlasting (Anaphalis margaritacea) -- in July -- Old Fall River Road, Rocky Mountain National Park, CO white & cream
pearly everlasting (Anaphalis margaritacea) -- in July -- Vedauwoo Recreation Area, southwestern Wyoming
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pearly everlasting (Anaphalis margaritacea) -- in August -- Shrine Pass Road, Eagle and Summit Counties, CO
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pearly pussytoes (Antennaria anaphaloides) -- in June -- Steens Mountain Wilderness Area, OR white & cream
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pearly pussytoes (Antennaria anaphaloides) -- in July -- Wild Basin, Rocky Mountain NP, CO
pearly pussytoes (Antennaria anaphaloides) -- in July -- Forest Road 145, Poudre Canyon, Larimer County, CO
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flat-top pussytoes (Antennaria corymbosa) -- in July -- FR 659 near Fairplay, Park County, CO white & cream
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flat-top pussytoes (Antennaria corymbosa) -- in June -- Sportsman Lake Road, Albany County, WY
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flat-top pussytoes (Antennaria corymbosa) -- in May -- Upper Beaver Meadows, RMNP, CO
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low pussytoes (Antennaria dimorpha) -- in April -- Rim Road west of Montrose, Montrose County, CO white & cream
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Rocky Mountain pussytoes (Antennaria media) -- in August -- Snowy Range, Medicine Bow National Forest, WY white & cream
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Rocky Mountain pussytoes (Antennaria media) -- in July -- Loveland Pass, Arapaho National Forest, CO white & cream
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littleleaf pussytoes (Antennaria microphylla) -- in June -- Rawah Wilderness, Larimer County, CO white & cream
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field pussytoes (Antennaria neglecta) -- in May -- Well Gulch Nature Trail, Lory State Park, CO white & cream
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field pussytoes (Antennaria neglecta) -- in May -- Plainview Road Open Space, Jefferson County, CO
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small-leaf pussytoes (Antennaria parvifolia) -- in May -- Pingree Park, Roosevelt National Forest, CO white & cream
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small-leaf pussytoes (Antennaria parvifolia) -- in June -- Lower Dadd Gulch, Poudre Canyon, Larimer County, CO
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tall pussytoes (Antennaria pulcherrima) -- in May -- Young Gulch, Poudre Canyon, Roosevelt National Forest, CO white & cream
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tall pussytoes (Antennaria pulcherrima) -- in June -- Well Gulch Nature Trail, Lory State Park
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tall pussytoes (Antennaria pulcherrima) -- in July -- Hermit Park Open Space, Larimer County, CO
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rosy pussytoes (Antennaria rosea) -- in May -- Old Flowers Road, Roosevelt National Forest, CO red & pink
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rosy pussytoes (Antennaria rosea) -- in July -- Red Feather Lakes area, CO
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solitary pussytoes (Antennaria solitaria) -- in April -- Pisgah National Forest, western North Carolina white & cream
burdock (Arctium minus) -- in August -- Lions Open Space, Larimer County, CO
burdock (Arctium minus) -- in September -- Bellvue, Larimer County Foothills, CO red & pink
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burdock (Arctium minus) -- in September -- Red Mountain Open Space, Larimer County, CO
Parry's arnica (Arnica parryi) -- in July -- Cameron Pass, Colorado State Forest State Park, CO yellow & orange
Parry's arnica (Arnica parryi) -- in August -- Snowy Range, Medicine Bow National Forest, WY yellow & orange
boreal sagebrush (Artemisia arctica) -- in August -- Mt. Evans Wilderness, Arapaho National Forest, CO yellow & orange
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boreal wormwood (Artemisia borealis) -- in July -- Mount Evans, Clear Creek County, CO red & pink
field sagewort (Artemisia campestris var. pacifica) -- in August -- Soapstone Prairie, Fort Collins Natural Area, Co green & brown
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field sagewort (Artemisia campestris var. pacifica) -- in October -- Gateway, Fort Collins Natural Area, CO
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tarragon (Artemesia dracunculus) -- in July -- Cherokee Park State Wildlife Area (Upper Unit), CO green & brown
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tarragon (Artemisia dracunculus) -- in September -- Cherokee State Park Wildlife Area (Lone Pine Unit), CO
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prairie sagewort (Artemisia frigida) -- in April -- Mill Creek Link Trail, Lory State Park, CO green & brown
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prairie sagewort (Artemisia frigida) -- in August -- Sportsman Lake Road, southern Wyoming
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plains sagewort (Artemesia frigida) -- in August -- Mount Margaret Trail, Red Feather Lakes Area, Larimer County, CO
prairie sagewort (Artemisia frigida) -- in September -- Arthur's Rock Trail, Lory State Park, CO
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white sagebrush (Artemisia ludoviciana) -- in April -- Horsetooth Reservoir, Larimer County Parks and Open Spaces green & brown
white sagebrush (Artemisia ludoviciana) -- in August -- Well Gulch Nature Trail, Lory State Park, CO green & brown
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white sagebrush (Artemisia ludoviciana) -- in August -- Ramsay-Shockey Open Space, Larimer County, CO
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white sagebrush (Artemisia ludoviciana) -- in September -- Reservoir Ridge, Fort Collins Natural Area, CO
white sagebrush (Artemisia ludoviciana ssp. ludoviciana) -- in August -- Red Fox Meadows, Fort Collins Natural Area, Larimer Cty, CO
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Rocky Mountain sage (Artemesia scopulorum) -- in July -- Hoosier Pass, Park/Summit Counties, CO
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Rocky Mountain sage (Artemisia scopulorum) -- in July -- Crown Point, Roosevelt National Forest, CO green & brown
Rocky Mountain sage (Artemisia scopulorum) -- in August -- Pikes Peak Area, CO
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big sagebrush (Artemisia tridentata) -- in July -- Cherokee Park State Wildlife Area (Upper Unit) --- green & brown
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devil's beggartick (Bidens frondosa) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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devil's beggartick (Bidens frondosa) -- in September -- Big Thompson Ponds State Wildlife Area, CO
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California brickellbush (Brickellia californica) -- in September -- Villanueva State Park, NM white & cream
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California brickellbush (Brickellia californica) -- in September -- Waterfall Trail, Lory State Park, CO
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false boneset (Brickellia eupatorioides) -- in August -- Arthur's Rock Trail, Lory State Park, CO white & cream
false boneset (Brickellia eupatorioides) -- in September -- South Valley Loop Trail, Lory State Park, CO
false boneset (Brickellia eupatorioides) -- in September -- Coyote Ridge, Fort Collins Natural Area, CO
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false boneset (Brickellia eupatorioides var. chlorolepsis) -- in September -- Villanueva State Park, NM white & cream
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Chihuahuan brickellbush (Brickellia floribunda) -- in September -- Villanueva State Park, NM white & cream
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tassle flower (Brickellia grandiflora) -- in August -- Arthur's Rock Trail, Lory State Park, CO white & cream
tassle flower (Brickellia grandiflora) -- in September -- Arthur's Rock Trail, Lory State Park, CO
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stinking brickellbush (Brickellia rusbyi) -- in September -- Cloudcroft, Lincoln National Forest, NM white & cream
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bristle thistle (Carduus nutans) -- in June -- Rabbit Mountain Open Space, Boulder County, CO red & pink
bristle thistle (Carduus nutans) -- in September -- Williams, Fort Collins Natural Area, Larimer County, Co
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bristle thistle (Carduus nutans) -- in February -- River's Edge Natural Area, Fort Collins, CO
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garden cornflower (Centaurea cyanus) -- in July -- Floriston, northern California blue & purple
garden cornflower (Centaurea cyanus) -- in July -- Klamath Falls to Ashland (Rt. 66), OR blue & purple
diffuse knapweed (Centaurea diffusa) -- in August -- Cameron Pass, Roosevelt National Forest, CO white & cream
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diffuse knapweed (Centaurea diffusa) -- in June -- Saint Vrain State Park, CO white & cream
diffuse knapweed (Centaurea diffusa) --- in August -- Indian Meadows North, Poudre Canyon, Larimer County, CO
diffuse knapweed (Centaurea diffusa) -- in August -- Saint Vrain State Park, CO
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Maltese star thistle (Centaurea melitensis) -- in April -- Big Bend National Park, Texas yellow & orange
spotted knapweed (Centaurea stoebe) -- in September -- Lincoln National Forest, NM red & pink
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Douglas' dustymaiden (Chaenactis douglasii) -- in July -- Sheldon National Wildlife Refuge, NV white & cream
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Douglas' dustymaiden (Chaenatis douglasii) -- in July -- Chambers Lake Area, Larimer County, CO
Douglas' dustymaiden (Chaenactis douglasii) -- in July -- Fremont National Forest, southern Oregon
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Douglas' dustymaiden (Chaenactis douglasii) -- in May -- Yampa Bench Rd, Dinosaur National Monument, CO
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Douglas' dustymaiden (Chaenactis douglasii var. douglasii) -- in September -- Marshall Pass Road, Chaffee County, CO
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pincushion flower (Chaenactis fremontii) -- in March -- U.S. 95 in southern Nevada white & cream
desert pincushion (Chaenactis stevioides) -- in March -- Gila Bend, Sonoran Desert National Monument, AZ white & cream
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desert pincushion (Chaenactis stevioides) -- in May -- San Juan County, Utah
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Anderson's thistle (Cirsium andersonii) -- in July -- Pacific Crest Trail, northern California red & pink
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Canada thistle (Cirsium arvense) -- in June -- Coyote Ridge, Fort Collins Natural Area, CO red & pink
Canada thistle (Cirsium arvense) -- in July -- McMurry, a Fort Collins Natural Area, Larimer County, CO
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Canada thistle (Cirsium arvense) -- in August -- Sportsman Lake Road, Wyoming
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Canada thistle (Cirsium arvense) -- in August -- Tanglewood, Fort Collins Natural Area, CO
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Canada thistle (Cirsium arvense) -- in August -- Arapaho National Wildlife Refuge, Jackson County, CO
Canada thistle (Cirsium arvense) -- in August -- Redwing Marsh, Fort Collins Natural Area, Larimer County, CO
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Canada thistle (Cirsium arvense) with unlobed leaves -- in August -- Williams, Fort Collins Natural Area, Larimer County, CO
creamy thistle (Cirsium canescens) -- in June -- Pingree Park, Roosevelt National Forest, CO white & cream
fringed thistle (Cirsium clavatum) -- in July -- Red Feather Lakes, Roosevelt National Forest, CO white & cream
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fringed thistle (Cirsium clavatum) -- in July -- Hermit Park Open Space, Larimer County, CO
fringed thistle (Cirsium clavatum) -- in July -- Buffalo Pass Road, Jackson County, CO
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Osterhout's thistle (Cirsium clavatum var. osterhoutii) -- Shrine Pass Road, border of Eagle and Summit Counties, CO
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Gray-green thistle (Cirsium cymosum var. canovirens) -- in June -- Steens Mountain WA, OR white & cream
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Eaton's thistle (Cirsium eatonii) -- in September -- Trail Ridge Road, Rocky Mountain National Park, CO blue and purple
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Steens Mountain thistle (Cirsium eatonii var. peckii) -- in June -- Steens Mountain Wilderness Area, OR red & pink
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New Mexico thistle (Cirsium neomexicanum) -- in April -- Organ Mountains-Desert Peaks, NM blue and purple
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yellowspine thistle (Cirsium ochrocentrum) -- in August -- Soapstone Prairie, Fort Collins Natural Area, CO red & pink
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yellowspine thistle (Cirsium ochrocentrum) -- in August -- Hutton Lake National Wildlife Refuge, Albany County, Wyoming
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Parry's thistle (Cirsium parryi) -- in July -- Herman Gulch, Clear Creek County, CO white & cream
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meadow thistle (Cirsium scariosum) -- in July -- Shoshone National Forest, Fremont County, Wy
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meadow thistle (Cirsium scariosum) -- in July -- Lassen Volcanic National Park, CA white & cream
meadow thistle (Cirsium scariosum) -- in September -- Marshall Pass Road, Chaffee County, CO
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mountain thistle (Cirsium scopulorum -- in July -- Georgia Pass, Park County, CO
mountain thistle (Cirsium scopulorum) -- in August -- Mount Evans Wilderness, Arapaho National Forest, CO white & cream
mountain thistle (Cirsium scopulorum) -- in August -- Pikes Peak Area, CO
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Tracy's thistle (Cirsium tracyi) -- in May -- Canyons of the Ancients National Monument, CO white & cream
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wavy-leaved thistle (Cirsium undulatum) -- in July -- Pineridge Natural Area, Fort Collins, CO red & pink
bull thistle (Cirsium vulgare) -- in August -- Well Gulch Nature Trail, Lory State Park, CO red & pink
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bull thistle (Cirsium vulgare) -- in May -- North Shields Ponds, Fort Collins Natural Area, CO
bull thistle (Cirsium vulgare) -- in August -- St. Vrain State Park, CO red & pink
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doublet (Dimeresia howellii) -- in July -- Modoc National Forest, CA white & cream
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button brittlebush (Encelia frutescens) --in March -- Organ Pipe Cactus National Monument, AZ yellow & orange
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rubber rabbitbrush (Ericameria nauseosa var. graveolens) -- in July -- Sand Creek National Landmark, WY yellow & orange
gall on rabbitbrush (Ericameria nauseosa var. graveolens) -- in April -- Bobcat Ridge, Fort Collins Natural Area, CO
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Parry's rabbitbrush (Ericameria parryi var. parryi) -- in August -- Colorado State Forest State Park, CO yellow & orange
Parry's rabbitbrush (Ericameria parryi var. parryi) -- in September -- Marshall Pass Road, Saguache County, CO
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rayless shaggy fleabane (Erigeron aphanactis) -- in June -- Steens Mountain WA, OR yellow & orange
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gold buttons (Erigeron compositus var. discoideus) -- in June -- Old Fall River Road, Rocky Mountain NP, CO yellow & orange
Brewer's aster (Eucephalus breweri) -- in July -- Pacific Crest Trail near Boreal, northern California yellow & orange
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fineleaf hymenopappus (Hymenopappus filifolius) -- in June -- Pawnee National Grassland, CO yellow & orange
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fineleaf hymenopappus (Hymenopappus filifolius) -- in May -- Neva Road/ 36, Boulder County, CO yellow & orange
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collegeflower (Hymenopappus flavescens) -- in June -- South Republican SWA, Yuma County, CO white & cream
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chalk hill Hymenopappus (Hymenopappus tenuifolius) -- in June -- Sand Creek National Landmark, CO white & cream
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dotted blazing star (Liatris punctata) -- in July -- Orchard Cove Trail, Lory State Park, CO red & pink white & cream
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dotted blazing star (Liatris punctata) -- in July -- Red Mountain Open Space, Larimer County, CO
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dotted blazing star (Liatris punctata) -- in July -- Lumpy Ridge Trail, RMNP, Larimer County, CO
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pineappleweed (Matricaria discoidea) -- in June -- Saint Vrain State Park, CO green & brown
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naked turtleback (Psathyrotes scaposa) -- in April -- Big Bend National Park, Texas white & cream
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Wright's cudweed (Pseudognaphalium canescens) -- in August -- St. Vrain State Park, CO white & cream
Russian knapweed (Rhaponticum repens) -- in September -- Lincoln National Forest, NM red & pink
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Russian knapweed (Rhaponticum repens) -- in June -- Dinosaur National Monument, Utah UT-N red & pink
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montane coneflower (Rudbeckia montana) -- in July -- McCullough Gulch, Summit County, CO green & brown
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western coneflower (Rudbeckia occidentalis) -- in July -- Grand Teton National Park, WY
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Hall's ragwort (Senecio bigelovii var. hallii) -- in July -- Herman Gulch, Clear Creek County, CO yellow & orange
Hall's ragwort (Senecio bigelovii var. hallii) -- in July -- San Isabel National Forest, CO
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Hall's ragwort (Senecio bigelovii var. hallii) -- in July -- Boreas Pass Road, Summit County, CO
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bashful ragwort (Senecio pudicus) -- in July -- Cub Lake Trail, Rocky Mountain National Park, CO yellow & orange
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openwoods ragwort (Senecio rapifolius) -- in August -- Twin Sisters Peak Trail, RMNP yellow & orange
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open-woods ragwort (Senecio rapifolius) -- in July -- Lumpy Ridge Trail, RMNP, Larimer County, CO
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common tansy (Tanacetum vulgare) -- in October -- High Line Canal Trail, Denver, CO yellow & orange
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Hopi tea greenthread (Thelesperma megapotamicum) -- in August -- South Valley Loop Trail, Lory State Park, CO yellow & orange
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Hopi tea greenthread (Thelesperma megapotamicum) -- in April -- Presidio County, western Texas yellow & orange
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American threefold (Trixis californica) -- in January -- Joshua Tree National Park, southern California yellow & orange
common cocklebur (Xanthium strumarium) -- in August -- Soldier Canyon Cove Trail, Lory State Park, CO white & cream
