Aster Subfamily 3.4 (Asteraceae) -- disk and yellow rays -- genus S to Z
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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badlands mule-ears (Scabrethia scabra ssp. scabra) -- in May -- San Juan County, Utah
Holm's ragwort (Senecio amplectens var. holmii) -- in July -- Baker Pass, Never Summer Mountains, Routt National Forest, CO
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Holm's ragwort (Senecio amplectens var. holmii) -- in July -- Boreas Pass Road, Park County, CO
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tall blacktip ragwort (Senecio atratus) -- in July -- Cameron Pass, Colorado State Forest State Park, CO
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tall blacktip ragwort (Senecio atratus) -- in July -- Loveland Pass, Arapaho National Forest, CO
tall blacktip ragwort (Senecio atratus) -- in August -- Weston Pass Road, Lake County, CO
golden ragwort (Senecio aureus) -- in April -- Natchez Trace Parkway, southern Tennessee
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thickleaf ragwort (Senecio crassulus) -- in August -- Snowy Range, Medicine Bow National Forest, WY
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thickleaf ragwort (Senecio crassulus) -- in July -- Zimmerman Lake Trail, Laramie County, CO
thickleaf ragwort (Senecio crassulus) -- in July -- Buffalo Pass Road, Jackson County, CO
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King's ragwort (Senecio eremophilus var. kingii) -- in September -- Bellaire Lake, Red Feather Lakes Area, Larimer County, CO
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King's ragwort (Senecio eremophilus var. kingii) -- in September -- Marshall Pass Road, Saguache County, CO
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threadleaf ragwort (Senecio flaccidus) -- in September -- Villanueva State Park, NM
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threadleaf ragwort (Senecio flaccidus) -- in April -- Organ Mountains-Desert Peaks National Monument, NM
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dwarf mountain ragwort (Senecio fremontii var. biltoides) -- in August -- Mt. Evans Wilderness, Arapaho NF
dwarf mountain ragwort (Senecio fremontii var. biltoides) -- in August -- Snowy Range, Medicine Bow National Forest
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dwarf mountain groundsel (Senecio fremontii var. fremontii) -- in July -- Lassen Volcanic National Park, CA
butterweed (Senecio glabellus) -- in April -- Natchez Trace Parkway, southern Tennessee
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lambstongue ragwort (Senecio integerrimus) -- in May -- South Valley Loop Trail, Lory State Park, CO
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lambstongue ragwort (Senecio integerrimus) -- in June -- Sportsman Lake Road, southern Wyoming
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lambstongule ragwort (Senecio integerrimus) -- in May -- Mariana Butte Natural Area, Loveland, CO
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tall ragwort (Senecio serra var. admirabilis) -- in July -- Buffalo Pass Road, Jackson County, CO
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tall ragwort (Senecio serra var. admirabilis) -- in August -- Mount Zirkel Wilderness, Jackson County, CO
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tall ragwort (Senecio serra var. serra) -- in July -- Grand Teton National Park, WY
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broom-like ragwort (Senecio spartioides) -- in August -- Sand Creek National Landmark, WY
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broom-like ragwort (Senecio spartioides) -- in August -- Prospect Ponds/ CSU ELC, Fort Collins, CO
dandelion ragwort (Senecio taraxacoides) -- in July -- Mount Evans, Clear Creek County, CO
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dandelion ragwort (Senecio taraxacoides) -- in August -- Mt. Evans Wilderness, Arapaho National Forest, CO
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arrowleaf ragwort (Senecio triangularis) -- in July -- Wild Basin, Rocky Mountain National Park, CO
arrowleaf ragwort (Senecio triangularis) -- Boreas Pass Road, Summit County, CO
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arrowleaf ragwort (Senecio triangularis) -- in July -- Shoshone National Forest, Fremont County, WY
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Wooton's ragwort (Senecio wootonii) -- in July -- Peak 7 area, Summit County, CO
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Wooton's ragwort (Senecio wootoniii) -- in June -- Golden Gate Canyon State Park, CO
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tall goldenrod (Solidago altissima) -- in July -- McMurry, a Fort Collins Natural Area, Larimer County, CO
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giant goldenrod (Solidago gigantea) -- in July -- Gregory Canyon, Boulder County, CO
giant goldenrod (Solidago gigantea) -- in August -- Well Gulch Nature Trail, Lory State Park
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giant goldenrod (Solidago gigantea) -- in July -- Parvin Lake State Wildlife Area, CO
giant goldenrod (Solidago gigantea) -- in September -- Springer, Fort Collins Natural Area, Larimer County, CO
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Missouri goldenrod (Solidago missouriensis) -- in July -- Waterfall Trail, Lory State Park, CO
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Missouri goldenrod (Solidago missouriensis) -- in August -- South Valley Loop Trail, Lory State Park, CO
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velvety goldenrod (Solidago mollis) -- in August -- Arthur's Rock Trail, Lory State Park, CO
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Rocky Mountain goldenrod (Solidago multiradiata var. scopulorum) -- in July -- Cameron Pass, Colorado State Forest State Park, CO
Rocky Mountain goldenrod (Solidago multiradiata var. scopulorum) -- in August -- Snowy Range, southern Wyoming
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Rocky Mountain goldenrod (Solidago multiradiata var. scopulorum) -- in August -- Zimmerman Lake Trail, Larimer County, CO
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baby goldenrod (Solidago nana) -- in July -- Forest Road 145, Poudre Canyon, Larimer County, CO
baby goldenrod (Solidago nana) -- in July -- Old Fall River Road, Rocky Mountain National Park, CO
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showy goldenrod (Solidago pallida) -- in August -- East Valley Trail, Lory State Park, Larimer County, CO
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stiff goldenrod (Solidago rigida var. humilis) -- in August -- South Valley Loop Trail, Lory State Park, CO
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stiff goldenrod (Solidago rigida var. humilis) --in August -- Ramsay-Shockey Open Area, Larimer County, CO
Mt. Albert goldenrod (Solidago simplex) -- in July -- Cub Lake Trail, Rocky Mountain National Park, CO
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Mt. Albert goldenrod (Solidago simplex) -- in July -- Peak 7 area, Summit County, CO
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Mt. Albert goldenrod (Solidago simplex) -- in July -- Grand Teton National Park, WY
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showy goldenrod (Solidago speciosa var. pallida) -- in August -- Red Feather Lakes Road, Larimer County, CO
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three-nerve goldenrod (Solidago velutina) -- in August -- Well Gulch Nature Trail, Lory State Park, CO
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Wright's goldenrod (Solidago wrightii) -- in September -- Cloudcroft, Lincoln National Forest, NM
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thrift mock goldenweed (Stenotus amerioides var. amerioides) -- in May -- Sand Creek National Landmark, WY
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thrift mock goldenweed (Stenotus amerioides var. amerioides) -- in May -- Red Mountain, Larimer County Open Space, CO
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stemless four-nerve daisy (Tetraneuris acaulis var. acaulis) -- in May -- Red Mountain, Larimer County, CO
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stemless four-nerve daisy (Tetraneuris acaulis var. acaulis) -- in June -- Sportsman Lake Road, WY
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Arizona four-nerve daisy (Tetraneuris acaulis var. arizonica) -- in April -- Rim Road west of Montrose, Montrose County, CO
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Arizona four-nerve daisy (Tetraneuris acaulis var. arizonica) -- in April -- Comanche National Grassland, CO
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caespitose four-nerve daisy (Tetraneuris acaulis var. caespitosa) -- in June -- Trail Ridge Road, RMNP, CO
caespitose four-nerve daisy (Tetraneuris acaulis var. caespitosa) -- in June -- Ute Trail, Trail Ridge Road, RMNP
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stemless four-nerve daisy (Tetraneuris acaulis var. epunctata) -- in May -- Picketwire Canyon, Comanche National Grassland, CO
stemless four-nerve daisy (Tetraneuris acaulis var. epunctata) -- in May -- Pawnee National Grassland, CO
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Ives' fournerved daisy (Tetraneuris ivesiana) -- in April -- Villanueva State Park, NM
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Ives' fournerved daisy (Tetraneuris ivesiana) -- in April -- Colorado National Monument, CO
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Ives' fournerved daisy (Tetraneuris ivesiana) -- in April -- Arches National Park, UT
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stemmy four-nerve daisy (Tetraneuris scaposa) -- in April -- Big Bend National Park, Texas
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stemmy four-nerve daisy (Tetraneuris scaposa var. scaposa) -- in June -- South Republican SWA, Yuma County, CO
Torrey's four-nerve daisy (Tetraneuris torreyana) -- in June -- Sand Creek National Landmark, WY
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stiff greenthread (Thelesperma filifolium) -- in June -- Pawnee National Grassland, CO
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pricklyleaf dogweed (Thymophylla acerosa) -- in April -- Dripping Springs Natural Area, NM
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fiveneedle pricklyleaf (Thymophylla pentachaeta) -- in April -- Big Bend National Park, Texas
pygmy goldenweed (Tonestus pygmaeus) -- in August -- Mt. Evans Wilderness, Arapaho National Forest, CO
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pygmy goldenweed (Tonestus pygmaeus) -- in August -- Pikes Peak Area, CO
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golden crownbeard (Verbesina encelioides) -- in September -- Villanueva State Park, NM
golden crownbeard (Verbesina encelioides) -- in September -- White Sands National Monument, NM
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golden crownbeard (Verbesina encelioides) -- in September -- Bluff Lake Nature Center, Denver Area, CO
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golden crownbeard (Verbesina encelioides) -- in September -- Red Mountain Open Space, Larimer County, CO
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resinbush (Viguiera stenoloba) -- in April -- Big Bend National Park, Texas yellow & orange
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mule-ears (Wyethia amplexicaulis) -- in July -- Routt National Forest, CO
mountain mule ears (Wyethia mollis) -- in July -- Lassen Volcanic National Park, CA
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slender goldenweed (Xanthisma gracile) -- in September -- Organ Mountain-Desert Peaks National Monument, NM
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spiny goldenweed (Xanthisma spinulosum) -- in April -- Route 54, near Carrizozo, southern New Mexico
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spiny goldenweed (Xanthisma spinulosum) -- in May -- Picketwire Canyon, Comanche National Grassland, CO
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spiny goldenweed (Xanthisma spinulosum) -- in August -- Soapstone Prairie, Fort Collins Natural Area, CO
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spiny goldenweed (Xanthisma spinulosum) -- in August -- Satanka Cove Trail, Lory State Park, CO
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spiny goldenweed (Xanthisma spinulosum) -- in September -- Satanka Cove Trail, Lory State Park, CO
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Rocky Mountain zinnia (Zinnia grandiflora) -- in July -- Bosque del Apache National Wildlife Refuge, NM
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