Oenothera genus --- Evening-primrose family

prairie evening primrose (Oenothera albicaulis) -- in May -- Pawnee National Grassland, CO        white & cream    

prairie evening primrose (Oenothera albicaulis) -- in May -- Canyons of the Ancients National Monument, CO  

common evening primrose (Oenothera biennis) -- in July -- Modoc National Forest, CA    yellow & orange   

short-fruit evening primrose (Oenothera brachycarpa)  in April -- Chihuahuan Desert Nature Center, TX   yellow & orange   

stemless evening primrose (Oenothera caespitosa) -- in May -- Well Gulch Nature Trail, Lory State Park, CO      white & cream

stemless evening primrose (Oenothera caespitosa) -- in May  -- Pawnee National Grassland, CO         white & cream      

tufted evening primrose (Oenothera caespitosa var. marginata) -- in April -- near Carrizozo, southern New Mexico    white & cream  ​   

stemless evening primrose (Oenothera caespitosa) -- in May -- Lory State Park, CO           

stemless evening primrose (Oenothera caespitosa) -- in June -- Sand Creek, WY

stemless evening primrose (Oenothera caespitosa) -- in April -- Arches National Park, UT

Coloraado beeblossom (Oenothera coloradensis) -- in August -- Orchard Cove Trail, Lory State Park, CO          white & cream       

Colorado beeblossom (Oenothera coloradensis) -- in July -- Sportsman Lake Road, near Tie Siding, WY          

                                                                                                                                                 20x magnification

cutleaf evening primrose (Oenothera coronopifolia) -- in July -- Gateway, a Fort Collins NA, Poudre Canyon, Larimer County, CO 

cutleaf evening primrose (Oenothera coronopifolia)  -- in August -- Sand Creek National Landmark, WY    white & cream  ​  

cutleaf evening primrose (Oenothera coronopifolia) -- in May -- South Valley Loop Trail, Lory State Park, CO              

velvetweed (Oenothera curtiflora)  -- in May  -- Lory State Park, CO           red & pink        

velvetweed (Oenothera curtiflora) -- in August -- Prospect Ponds/ CSU ELC, Fort Collins, CO    

birdcage evening primrose (Oenothera deltoides) -- in March -- Milpitas Wash Road, southern California    white & cream  ​  

birdcage evening primrose (Oenothera deltoides) -- in July -- off of I-70, northern Utah    white & cream  ​  

western evening primrose (Oenothera elata var. hirsutissima) -- in July -- McMurry, Fort Collins Natural Area, Larimer County, CO

Hartweg's sundrops (Oenothera hartwegii) -- in April -- Big Bend National Park, Texas    yellow & orange ​   

Hartweg's sundrops (Oenothera hartwegii) -- in April -- Chihuahuan Desert Nature Center, TX     

Howard's evening-primrose (Oenothera howardii) -- in May -- Neva Road/ 36, Boulder County, CO    yellow & orange  

Howard's evening primrose (Oenothera howardii) -- in May -- Crain High Plains Prairie, Boulder County, CO

cutleaved evening primrose (Oenothera laciniata) --  in April  -- western Texas     yellow & orange       

lavenderleaf sundrops (Oenothera lavandulifolia) -- in May -- Pawnee Buttes, Pawnee National Grassland, CO yellow & orange ​   

lavenderleaf sundrops (Oenothera lavandulifolia) -- in June -- South Republican SWA, Yuma County, CO

lavenderleaf sundrops (Oenothera lavandulifolia) -- in May -- Canyons of the Ancients National Monument, CO

Nuttall's evening primrose (Oenothera nuttallii) -- in July -- Young Gulch, Poudre Canyon, Larimer County, CO

Nuttall's evening primrose (Oenothera nuttallii) -- in August -- Eagle's Nest Open Space, Larimer County, CO

pale evening primrose (Oenothera pallida ssp. latifolia) -- in May -- San Juan County, Utah      ​ white & cream 

pale evening primrose (Oenothera pallida) -- in April -- Arches National Park, UT

desert evening primrose (Oenothera primiveris) -- in April -- Organ Mountains-Desert Peaks, NM    yellow & orange ​

dainty sundrops (Oenothera serrulata)  -- in June -- South Valley Loop Trail, Lory State Park, CO        yellow & orange       

dainty sundrops (Oenothera serrulata) -- in June --  South Republican SWA, Yuma County, CO    

scarlet beeblossom (Oenothera suffrutescens) -- in May -- Neva Road/36, Boulder County, Co

scarlet beeblossom (Oenothera suffrutescens) -- in April -- western Texas        white & cream ​    

hairy evening primrose (Oenothera villosa var. strigosa) -- in August -- Rocky Mountain National Park, CO       

hairy evening primrose (Oenothera villosa var. villosa) -- in July -- Lory State Park, CO          yellow & orange       

hairy evening primrose (Oenothera villosa var. villosa) -- in September -- Buckhorn Canyon, Larimer County Foothills, CO

hairy evening primrose (Oenothera villosa) -- in February -- River's Edge Natural Area, Fort Collins, CO